Seriola quinqueradiata

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Keiichi Mushiake - One of the best experts on this subject based on the ideXlab platform.

  • Effect of timing of restricted feeding on sexual maturation in female yellowtail, Seriola quinqueradiata
    Aquaculture, 2017
    Co-Authors: Kentaro Higuchi, Keiichi Mushiake, Kazunori Yoshida, Koichiro Gen, Mitsuo Nyuji, Toshinori Takashi, Kiyoshi Soyano
    Abstract:

    Abstract In aquaculture of species with a large body size such as tuna and yellowtail, a major problem still is that broodstock management for egg collection requires high feeding cost and labor. In order to reduce feeding costs, development of restricted feeding techniques without affecting the reproductive performance may be useful. To gain a better understanding of reproductive responses to food supply, we examined the effect of restricted feeding during the previtellogenic and vitellogenic phases on sexual maturation in female yellowtail, Seriola quinqueradiata. Restricted feeding during the vitellogenic phase tended to reduce ovary weight relative to normally fed controls at the end of the experiment. Histological observations revealed that both restricted feeding regimes do not affect the percentage of atretic follicles as compared to the control group. Nevertheless, the mean diameter of the most advanced follicles of the females subjected to restricted feeding during the vitellogenic phase was significantly smaller to normally fed controls. These results suggest that reduced food intake during the vitellogenic phase is likely to delay oocyte growth, and lead to low ovarian weight. Endocrine analyses showed that restricted feeding during the vitellogenic phase reduced plasma 17β-estradiol levels, but not plasma and pituitary gene expression levels of gonadotropins (follicle-stimulating hormone and luteinizing hormone) at the end of the experiment. Transcripts for ovarian steroidogenesis-related genes, such as P450 side-chain cleavage (cyp11a1) and 3β-hydroxysteroid dehydrogenase (hsd3b) after food restriction during the vitellogenic phase tended to be high. Therefore, the effects of restricted feeding on reproduction would not be mediated by alterations in circulating gonadotropin levels, but rather through direct effects on the ovarian steroid production in yellowtail females.

  • effects of taurine levels in broodstock diet on reproductive performance of yellowtail Seriola quinqueradiata
    Fisheries Science, 2006
    Co-Authors: Hiroyuki Matsunari, Keiichi Mushiake, Kazuhisa Hamada, Toshio Takeuchi
    Abstract:

    The effect of dietary taurine was investigated on reproductive performance in yellowtail Seriola quinqueradiata. Two-year-old fish of average body weight 6.1kg were fed on diets containing three levels of taurine (T-0, T-0.5 or T-1.0%) for 5 months prior to spawning. For spawning investigations, fish were induced to maturity by human chorionic gonadotrop in injection (600 IU/kg-fish) and artificially inseminated. Oocyte growth improved significantly (P<0.05) with the increase of dietary taurine. The collection of eggs from females reared on the T-0% diet was not successful. The success rate of spawning for females fed on T-0.5 and 1.0% diets was one out of six, and six out of seven, respectively. The taurine levels of the liver and serum in the T-0% diet group were much lower than that in the T-0.5 and T-1.0% diet groups (P<0.05). Fish fed the T-0% diet showed higher contents of serine in the liver and serum. The taurine content of the ovary was not significantly different among the different dietary treatments. These results indicate that taurine has a positive effect on the improvement of spawning performance of yellowtail.

  • Effects of taurine levels in broodstock diet on reproductive performance of yellowtail Seriola quinqueradiata
    Fisheries Science, 2006
    Co-Authors: Hiroyuki Matsunari, Keiichi Mushiake, Kazuhisa Hamada, Toshio Takeuchi
    Abstract:

    The effect of dietary taurine was investigated on reproductive performance in yellowtail Seriola quinqueradiata. Two-year-old fish of average body weight 6.1kg were fed on diets containing three levels of taurine (T-0, T-0.5 or T-1.0%) for 5 months prior to spawning. For spawning investigations, fish were induced to maturity by human chorionic gonadotrop in injection (600 IU/kg-fish) and artificially inseminated. Oocyte growth improved significantly (P

  • effect of dietary taurine supplementation on growth performance of yellowtail juveniles Seriola quinqueradiata
    Fisheries Science, 2005
    Co-Authors: Hiroyuki Matsunari, Toshio Takeuchi, Makoto Takahashi, Keiichi Mushiake
    Abstract:

    The effect of taurine on growth of yellowtail juveniles Seriola quinqueradiata was investigated by a feeding experiment of diets containing various taurine levels. Test diets supplemented with 0, 0.5, 1.0, 1.5 and 2.0% of taurine were prepared. These diets were fed to yellowtail juveniles with an initial mean body weight of 0.5 g for 6 weeks. Supplementation of taurine in the diet of yellowtail improved their growth performance significantly (P<0.05) over the initial 3-week period. The fish fed with the taurine-supplemented diet improved in percent gain and feed efficiency over both 3 and 6 weeks. Taurine content in the muscle proportionally increased with the dietary taurine level. The fish fed without supplemented taurine diet showed higher contents of serine in the muscle. With each increase in the inclusion level of taurine content in the diet, the concentration of serine in the muscle decreased. The cystathionine content in the muscle of each group was unchanged. These results suggest that taurine supplementation in the diet not only improves growth but also affects the sulfur amino acid metabolism of yellowtail juveniles.

  • Genetic linkage maps of two yellowtails (Seriola quinqueradiata and Seriola lalandi)
    Aquaculture, 2005
    Co-Authors: Eriko Ohara, Yoshitomo Nagakura, Keiichi Mushiake, Takuya Nishimura, Takashi Sakamoto, Nobuaki Okamoto
    Abstract:

    The yellowtails Seriola quinqueradiata and Seriola lalandi are the most important species in marine fishery resources and aquaculture in Japan. A genetic linkage map is needed to improve efficiency of breeding by marker-assisted selection (MAS) and for the identification of commercially important genes. Therefore, we have constructed a genetic linkage map for the yellowtails using microsatellite markers. Microsatellites were isolated from a genomic DNA library of S. quinqueradiata. Segregation of 217 microsatellites was studied in 90 progeny from a cross between S. quinqueradiata and S. lalandi. These were used to construct separate linkage maps of a female (S. quinqueradiata) and a male (S. lalandi). Twenty-five linkage groups were distinguished in the female (S. quinqueradiata) map, which spanned for 473.3 centiMorgans (cM) with an average intermarker distance of 2.7 cM (total length estimated: 901.7 cM), and 21 linkage groups were distinguished in the male (S. lalandi) map, which spanned 584.3 cM with an average intermarker distance of 4.8 cM (total length estimated: 1715.3 cM). The microsatellite loci and genetic linkage maps will increase the efficiency of selective breeding programs for yellowtails.

Toshiro Masumoto - One of the best experts on this subject based on the ideXlab platform.

  • Development of a docosahexaenoic acid (DHA)-rich yellowtail Seriola quinqueradiata using tuna by-product oil
    Fisheries Science, 2017
    Co-Authors: Junpei Shinagawa, Toshiro Masumoto, Haruka Morino, Haruhisa Fukada
    Abstract:

    Because a diet rich in docosahexaenoic acid (DHA) is beneficial to human health, it is desirable for yellowtail Seriola quinqueradiata intended for human consumption to contain a high amount of DHA. We investigated the effects on the growth and fatty acid composition of yellowtail of replacing some of the pollack liver oil (PO) in the yellowtail diet with a DHA-rich tuna oil (TO). Experimental diets were prepared in which PO was replaced with 0, 15, 30, and 60% TO. Replacement of PO with TO did not negatively affect growth in a 16-week trial. In contrast, the feed efficiency of the group that received 60% TO was significantly higher than that of the control group after 6 weeks. The DHA level in the whole fish body increased with increasing dietary TO level. The groups that received 30 and 60% TO replacement diets showed significantly higher DHA levels than those of the control group. DHA level in the fillet was significantly higher in the group that received 60% TO than in the control group. DHA retention tended to increase with increasing TO level. These results show that utilizing TO as a fat source can increase DHA accumulation without incurring any adverse effects on the growth of yellowtail.

  • Taurine supplementation and palm oil substitution in low-fish meal diets for young yellowtail Seriola quinqueradiata
    Aquaculture, 2013
    Co-Authors: Peerapon Khaoian, Hung Phuc Nguyen, Yasuhiko Ogita, Haruhisa Fukada, Toshiro Masumoto
    Abstract:

    Abstract The effects of taurine supplementation and palm oil replacement in a low-fish meal (FM) diet for yellowtail ( Seriola quinqueradiata ) were examined in a feeding experiment using four different diets. The control diet had an FM content of 600 g/kg (FM60). The low-FM diets contained 350 g/kg FM, 170 g/kg corn gluten meal, and 170 g/kg defatted soybean meal (FM35). Taurine was supplemented in FM35 at 7.5 g/kg (FM35T). Fish oil in the FM35T diet was replaced with palm oil (FM35TPO). Juvenile fish (initial body weight 236 g) were fed these diets for 36 weeks. The mean body weight and specific growth rate were not significantly different among the treatments until 24 weeks (week 24). However, they were significantly higher in FM35T-fed fish compared with FM35-fed fish at week 36. The feed intake levels of FM35- and FM35T-fed fish were comparable or higher than that of FM60-fed fish whereas the intake levels of FM35TPO-fed fish were always significantly higher than those of FM60- and FM35T-fed fish ( P P

  • Response of cholecystokinin and digestive enzyme mRNA levels to various feed ingredients in yellowtail Seriola quinqueradiata
    Fisheries Science, 2012
    Co-Authors: Takahiro Furutani, Toshiro Masumoto, Haruhisa Fukada
    Abstract:

    Cholecystokinin (CCK) is the key regulator hormone that stimulates the secretion of digestive pancreatic enzymes in vertebrates. In fish, little is known about the mechanism of induction of CCK in the digestive tract by feed ingredients. To investigate the response of CCK and digestive enzymes to fish feed ingredients in yellowtail Seriola quinqueradiata, we performed a number of experiments in which we measured the mRNA levels of CCK, trypsin, and lipase after oral administration of a single bolus of the ingredients. We administered fish meal and fish oil in experiment 1; high and low concentrations of fish meal in experiment 2; and five different dietary protein sources (fish meal, soybean meal, soy protein concentrate, corn gluten meal, and glutamic acid fermentation by-products) in experiment 3. In experiments 1 and 3, only fish meal significantly increased the mRNA levels of CCK and digestive enzyme. In experiment 2, a high concentration of fish meal [20 % (w/v)] significantly increased CCK and trypsin mRNA levels, but a low concentration of fish meal [1 % (w/v)] did not. These results suggest that high concentrations of fish meal (the protein source in fish feed) has the most potent effect on stimulation of CCK synthesis and secretion of digestive enzymes in yellowtail.

  • Effects of exogenous cholecystokinin and gastrin on the secretion of trypsin and chymotrypsin from yellowtail (Seriola quinqueradiata) isolated pyloric caeca
    Comparative biochemistry and physiology. Part A Molecular & integrative physiology, 2006
    Co-Authors: Patricia Yumi Morimoto Kofuji, Koji Murashita, Hidetsuyo Hosokawa, Toshiro Masumoto
    Abstract:

    Abstract The humoral control of secretion of the proteolytic enzymes trypsin and chymotrypsin was studied in yellowtail ( Seriola quinqueradiata ). In vitro trials were performed to investigate the effects of cholecystokinin (CCK) and two commercially available gastrin peptides. Isolated preparations of pyloric caeca/pancreas release trypsin and chymotrypsin when incubated with cholecystokinin (CCK) at 10 μM and gastrin I (G1) at 50 μM after 15 min of incubation. On the other hand, G1 at 10 μM and gastrin-related peptide (G2) did not enhance trypsin and chymotrypsin secretion. The studies concerning the CCK effects at different incubation temperatures have shown that trypsin and chymotrypsin secretion at 25 °C was stimulated by CCK after 15 min, while at 10, 15 and 20 °C the stimulatory effects of CCK were observed only after 30 min of incubation. The CCK effects were increased at higher incubation temperatures and longer incubation periods.

  • effects of dietary supplementation with feeding stimulants on yellowtail Seriola quinqueradiata temminck schlegel carangidae protein digestion at low water temperatures
    Aquaculture Research, 2006
    Co-Authors: Patricia Yumi Morimoto Kofuji, Hidetsuyo Hosokawa, Toshiro Masumoto
    Abstract:

    Feeding trials were carried out to examine substances that could be used as supplements in low-protein/high-lipid diets to improve protein digestion of yellowtails (Seriola quinqueradiata) during winter. Dietary supplementation with synthetic or natural (krill and squid extracts) feeding stimulants (FS) improved feed intake and growth performance of yellowtails. Moreover, the apparent protein digestibility (APD) and pepsin, trypsin and chymotrypsin secretions in fish fed diets supplemented with the different FS were superior to those in fish fed the control diet. These findings suggest that the dietary inclusion of either synthetic or natural FS is a potential tool for improving protein digestion at low water temperatures, and may provide a promising solution for the winter growth retardation experienced in yellowtail culture.

Masahiro Sakai - One of the best experts on this subject based on the ideXlab platform.

  • experimental induction of nocardiosis in yellowtail Seriola quinqueradiata temminck schlegel by artificial challenge
    Journal of Fish Diseases, 2006
    Co-Authors: T. Itano, Tomoya Kono, H. Kawakami, Masahiro Sakai
    Abstract:

    Challenge methods for inducing nocardiosis, caused by Nocardia Seriolae in yellowtail, Seriola quinqueradiata, were evaluated. The first method involved intraperitoneal injection of 1.1 x 10(2), x 10(3) and x 10(4) cfu of N. Seriolae; the second was by bath immersion with three different concentrations of bacterial suspension for 10 min; the third was by intradermal injection using a multipuncture device; the fourth was by oral administration using a tube; the fifth was based on the co-habitation of uninfected fish with others that had been artificially infected, i.e. intraperitoneally or by immersion for 10 min. The LD(50) values for the infection trials were 1.9 x 10(2) (intraperitoneal injection), 1.5 x 10(4) mL(-1) (immersion), 4.3 x 10(6) (intradermal injection) and 1.7 x 10(7) (oral administration). In the co-habitation challenge, mortalities were 70% and 50% in groups of non-infected fish mixed with fish infected by the i.p. injection and immersion methods, respectively. Fish challenged by intraperitoneal injection developed adhesions. Fish challenged by other methods did not show any gross clinical signs and moribund fish were similar to natural infection.

  • Live vaccine trials against nocardiosis in yellowtail Seriola quinqueradiata
    Aquaculture, 2006
    Co-Authors: Tomokazu Itano, Hidemasa Kawakami, Tomoya Kono, Masahiro Sakai
    Abstract:

    Abstract In an attempt to develop a vaccine against Nocardia Seriolae , related species of live bacteria N. soli , N. fluminea , and N. uniformis were injected into yellowtail Seriola quinqueradiata . In addition, fish were challenged with a low virulence strain of N. Seriolae to model the concept of use of a live vaccine. The fish injected with live N. soli and N. fluminea cells showed slight resistance against an artificial challenge with N. Seriolae . On the other hand, the fish that survived the N. Seriolae infection showed complete resistance to the N. Seriolae challenge. These results suggest that protective immune responses against N. Seriolae are induced in yellowtails.

  • Experimental induction of nocardiosis in yellowtail, Seriola quinqueradiata Temminck & Schlegel by artificial challenge
    Journal of fish diseases, 2006
    Co-Authors: T. Itano, Tomoya Kono, H. Kawakami, Masahiro Sakai
    Abstract:

    Challenge methods for inducing nocardiosis, caused by Nocardia Seriolae in yellowtail, Seriola quinqueradiata, were evaluated. The first method involved intraperitoneal injection of 1.1 x 10(2), x 10(3) and x 10(4) cfu of N. Seriolae; the second was by bath immersion with three different concentrations of bacterial suspension for 10 min; the third was by intradermal injection using a multipuncture device; the fourth was by oral administration using a tube; the fifth was based on the co-habitation of uninfected fish with others that had been artificially infected, i.e. intraperitoneally or by immersion for 10 min. The LD(50) values for the infection trials were 1.9 x 10(2) (intraperitoneal injection), 1.5 x 10(4) mL(-1) (immersion), 4.3 x 10(6) (intradermal injection) and 1.7 x 10(7) (oral administration). In the co-habitation challenge, mortalities were 70% and 50% in groups of non-infected fish mixed with fish infected by the i.p. injection and immersion methods, respectively. Fish challenged by intraperitoneal injection developed adhesions. Fish challenged by other methods did not show any gross clinical signs and moribund fish were similar to natural infection.

  • Cloning, sequence and variability analysis of expressed immunoglobulin light chain genes from yellowtail Seriola quinqueradiata.
    Fish & shellfish immunology, 2003
    Co-Authors: Kazuyoshi Okamoto, Hideki Ikemura, Ram Savan, Masahiro Sakai
    Abstract:

    Abstract The cDNA clones encoding immunoglobulin (Ig) light (L) chain variable (V) region associated with constant (C) region were isolated from yellowtail ( Seriola quinqueradiata ) kidney by expressed sequence tag analysis (accession numbers: AB062619–AB062668, AB064322). The sequences of both VL and CL region contain well-conserved cysteine residues important for intra- and inter-domain interaction in mammals. Comparisons of the amino acid sequence of the CL domain with those of other species showed a high degree of similarity, with 88·3%, 59·8%, and 60·6% to those of wolf fish ( Anarhichas lupus ), rainbow trout IgL I isotype ( Oncorhynchus mykiss ) and channel catfish G isotype ( Ictalurus punctatus ), respectively. Multiple sequence alignments of the CL domain with those of higher vertebrates, however, did not readily allow it to be classified as κ or λ isotypes. Furthermore, the pI, hydrophobicity and variability of yellowtail VL regions were studied in 65 cDNA clones and the diversity was observed in CDR1, CDR2 and CDR3 regions.

  • Analysis of expressed sequence tags from a yellowtail, Seriola quinqueradiata (Temminck & Schlegel), head kidney cDNA library.
    Aquaculture Research, 2002
    Co-Authors: Tomoya Kono, Kazuyoshi Okamoto, Masahiro Sakai
    Abstract:

    We generated 436 expressed sequence tags (EST) from a Yellowtail, Seriola quinqueradiata (Temminck & Schlegel), kidney cDNA library. Of these, 233 EST (53.4%) showed no homology to known genes, while 203 EST (46.6%) showed homology to known genes and transcripts. Bio-defence-related cDNAs identified from kidney were ikaros, an immunogloblin light chain and several heat shock proteins. Of the other related EST, 57 were homologous to 27 different ribosomal-related proteins and rRNA genes, 2 different mitochondrial genes and the remaining 77 encoded 36 different identified genes.

Nobuaki Okamoto - One of the best experts on this subject based on the ideXlab platform.

  • Identification of the sex-linked locus in yellowtail, Seriola quinqueradiata
    Aquaculture, 2010
    Co-Authors: Kanako Fuji, Nobuaki Okamoto, Kazunori Yoshida, Keita Hattori, Akiyuki Ozaki, Kazuo Araki, Masanori Okauchi, Satoshi Kubota, Takashi Sakamoto
    Abstract:

    article i nfo The sex-determining system of yellowtail (Japanese amberjack), Seriola quinqueradiata, is not known. In this study, we identified the sex-linked locus in yellowtail and we characterized the sex-determining system by genetic linkage analysis conducted on 19 female and 19 male progenies from a single family. The associations between phenotypic sex and genotypic data of 71 microsatellite markers selected from yellowtail genetic linkage map were tested. The putative sex-determining locus is located between locus Sequ21 and locus Sequ17 in LG12, and the sex-linked alleles were inherited from the female parent. This result suggests that yellowtail has a ZZ-ZW sex-determining system, and that it would be possible to use these sex-linked markers to discriminate the sexes.

  • Genetic linkage maps of two yellowtails (Seriola quinqueradiata and Seriola lalandi)
    Aquaculture, 2005
    Co-Authors: Eriko Ohara, Yoshitomo Nagakura, Keiichi Mushiake, Takuya Nishimura, Takashi Sakamoto, Nobuaki Okamoto
    Abstract:

    The yellowtails Seriola quinqueradiata and Seriola lalandi are the most important species in marine fishery resources and aquaculture in Japan. A genetic linkage map is needed to improve efficiency of breeding by marker-assisted selection (MAS) and for the identification of commercially important genes. Therefore, we have constructed a genetic linkage map for the yellowtails using microsatellite markers. Microsatellites were isolated from a genomic DNA library of S. quinqueradiata. Segregation of 217 microsatellites was studied in 90 progeny from a cross between S. quinqueradiata and S. lalandi. These were used to construct separate linkage maps of a female (S. quinqueradiata) and a male (S. lalandi). Twenty-five linkage groups were distinguished in the female (S. quinqueradiata) map, which spanned for 473.3 centiMorgans (cM) with an average intermarker distance of 2.7 cM (total length estimated: 901.7 cM), and 21 linkage groups were distinguished in the male (S. lalandi) map, which spanned 584.3 cM with an average intermarker distance of 4.8 cM (total length estimated: 1715.3 cM). The microsatellite loci and genetic linkage maps will increase the efficiency of selective breeding programs for yellowtails.

  • isolation and characterization of microsatellite loci from yellowtail Seriola quinqueradiata and cross species amplification within the genus Seriola
    Molecular Ecology Notes, 2003
    Co-Authors: Eriko Ohara, Yoshitomo Nagakura, Keiichi Mushiake, Takashi Sakamoto, T. Nishimura, Nobuaki Okamoto
    Abstract:

    We developed five microsatellite primer pairs for the yellowtail Seriola quinqueradiata. The loci were highly polymorphic, with eight to 14 alleles per locus, and can be used to study kinship and/or population structure. Many of these primer pairs amplified polymorphic loci in cross-species amplification tests for two other Seriola species (S. lalandi and S. dumerili).

  • Isolation and characterization of microsatellite loci from yellowtail Seriola quinqueradiata and cross‐species amplification within the genus Seriola
    Molecular Ecology Notes, 2003
    Co-Authors: Eriko Ohara, Yoshitomo Nagakura, Keiichi Mushiake, Takashi Sakamoto, T. Nishimura, Nobuaki Okamoto
    Abstract:

    We developed five microsatellite primer pairs for the yellowtail Seriola quinqueradiata. The loci were highly polymorphic, with eight to 14 alleles per locus, and can be used to study kinship and/or population structure. Many of these primer pairs amplified polymorphic loci in cross-species amplification tests for two other Seriola species (S. lalandi and S. dumerili).

Hiroyuki Matsunari - One of the best experts on this subject based on the ideXlab platform.

  • Effect of a plant-based low-fishmeal diet on digestive physiology in yellowtail Seriola quinqueradiata
    Aquaculture, 2019
    Co-Authors: Koji Murashita, Hiroyuki Matsunari, Haruhisa Fukada, Hiromi Oku, Nobuhiro Suzuki, Hirofumi Furuita, Ivar Rønnestad, Hazuki Yoshinaga, Takeshi Yamamoto
    Abstract:

    Abstract To characterize the effects of a plant-based low-fishmeal (LFM) diet on the digestive physiology of yellowtail, Seriola quinqueradiata, we prepared two isonitrogenous and isolipidic diets; an FM-based diet (diet Control, FM 50%) and a plant protein (soybean meal and corn gluten meal)-based low fishmeal diet (diet LFM, FM 15%), and examined the acute and chronic effects of the diets on the digestive physiology of the fish were examined. In the acute effect trial (fed only a single meal), the fish fed the LFM diet displayed faster gastric emptying, lower pH of the gastrointestinal content and suppressed pancreatic digestive enzymes (trypsin, chymotrypsin and amylase) secretions. In the chronic effect trial (feeding for six weeks), in addition to the effects observed in the acute trial, the fish fed the LFM diet also displayed suppressed stomach pepsin secretion and pancreatic digestive enzymes production (gene expression). Furthermore, gene expression levels of digestion-regulating hormones, gastrin, cholecystokinin and peptide yy were also disrupted by the long-term administration of the LFM diet. Taken together, these results indicate that a plant protein-based low fish meal diet appears to not fully activate or stimulate the digestive system of yellowtail in either the short or long term and that its inhibitory/disruptive effects become more pronounced on a long-term basis. The effects we have identified on yellowtail digestive physiology could serve as important indicators to improve the plant-based low-fishmeal diets.

  • effects of taurine levels in broodstock diet on reproductive performance of yellowtail Seriola quinqueradiata
    Fisheries Science, 2006
    Co-Authors: Hiroyuki Matsunari, Keiichi Mushiake, Kazuhisa Hamada, Toshio Takeuchi
    Abstract:

    The effect of dietary taurine was investigated on reproductive performance in yellowtail Seriola quinqueradiata. Two-year-old fish of average body weight 6.1kg were fed on diets containing three levels of taurine (T-0, T-0.5 or T-1.0%) for 5 months prior to spawning. For spawning investigations, fish were induced to maturity by human chorionic gonadotrop in injection (600 IU/kg-fish) and artificially inseminated. Oocyte growth improved significantly (P<0.05) with the increase of dietary taurine. The collection of eggs from females reared on the T-0% diet was not successful. The success rate of spawning for females fed on T-0.5 and 1.0% diets was one out of six, and six out of seven, respectively. The taurine levels of the liver and serum in the T-0% diet group were much lower than that in the T-0.5 and T-1.0% diet groups (P<0.05). Fish fed the T-0% diet showed higher contents of serine in the liver and serum. The taurine content of the ovary was not significantly different among the different dietary treatments. These results indicate that taurine has a positive effect on the improvement of spawning performance of yellowtail.

  • Effects of taurine levels in broodstock diet on reproductive performance of yellowtail Seriola quinqueradiata
    Fisheries Science, 2006
    Co-Authors: Hiroyuki Matsunari, Keiichi Mushiake, Kazuhisa Hamada, Toshio Takeuchi
    Abstract:

    The effect of dietary taurine was investigated on reproductive performance in yellowtail Seriola quinqueradiata. Two-year-old fish of average body weight 6.1kg were fed on diets containing three levels of taurine (T-0, T-0.5 or T-1.0%) for 5 months prior to spawning. For spawning investigations, fish were induced to maturity by human chorionic gonadotrop in injection (600 IU/kg-fish) and artificially inseminated. Oocyte growth improved significantly (P

  • effect of dietary taurine supplementation on growth performance of yellowtail juveniles Seriola quinqueradiata
    Fisheries Science, 2005
    Co-Authors: Hiroyuki Matsunari, Toshio Takeuchi, Makoto Takahashi, Keiichi Mushiake
    Abstract:

    The effect of taurine on growth of yellowtail juveniles Seriola quinqueradiata was investigated by a feeding experiment of diets containing various taurine levels. Test diets supplemented with 0, 0.5, 1.0, 1.5 and 2.0% of taurine were prepared. These diets were fed to yellowtail juveniles with an initial mean body weight of 0.5 g for 6 weeks. Supplementation of taurine in the diet of yellowtail improved their growth performance significantly (P<0.05) over the initial 3-week period. The fish fed with the taurine-supplemented diet improved in percent gain and feed efficiency over both 3 and 6 weeks. Taurine content in the muscle proportionally increased with the dietary taurine level. The fish fed without supplemented taurine diet showed higher contents of serine in the muscle. With each increase in the inclusion level of taurine content in the diet, the concentration of serine in the muscle decreased. The cystathionine content in the muscle of each group was unchanged. These results suggest that taurine supplementation in the diet not only improves growth but also affects the sulfur amino acid metabolism of yellowtail juveniles.

  • Effect of dietary taurine supplementation on growth performance of yellowtail juveniles Seriola quinqueradiata
    Fisheries Science, 2005
    Co-Authors: Hiroyuki Matsunari, Toshio Takeuchi, Makoto Takahashi, Keiichi Mushiake
    Abstract:

    The effect of taurine on growth of yellowtail juveniles Seriola quinqueradiata was investigated by a feeding experiment of diets containing various taurine levels. Test diets supplemented with 0, 0.5, 1.0, 1.5 and 2.0% of taurine were prepared. These diets were fed to yellowtail juveniles with an initial mean body weight of 0.5 g for 6 weeks. Supplementation of taurine in the diet of yellowtail improved their growth performance significantly (P

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