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Arild Folkvord - One of the best experts on this subject based on the ideXlab platform.
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the effects of light darkness and intermittent feeding on the growth and survival of reared atlantic Bonito and atlantic bluefin tuna larvae
Aquaculture, 2017Co-Authors: E Blanco, Aurelio Ortega, Fernando De La Gándara, Patricia Reglero, Øyvind Fiksen, Arild FolkvordAbstract:Abstract In larval culture, long light photoperiod regimes are used to maximize ingestion rates by increasing the accessibility to prey and therefore enhancing larval growth. Intermittent feeding could provide a viable alternative to the commonly used continuous feeding regimes that aim to improve larval growth and survival. In this study, we investigate the effect of alternating light/darkness regimes with intermittent feeding on the growth and survival of piscivorous larvae of two Scombrid species: Atlantic Bonito, Sarda sarda (Bloch, 1793) and Atlantic bluefin tuna Thunnus thynnus (Linnaeus, 1758) . First we tested if the manipulation of a light regime generated intermittent feeding by analyzing the larval stomach content. Then, we conducted two laboratory experiments to identify the best alternating light regime that maximized larval growth and survival by comparing the results to those obtained using continuous light regimes. The manipulation of light was optimized to provide intermittent feeding opportunities for the larvae, since we discovered a clear interruption of feeding in darkness. An increase in specific ingestion throughout the day was observed in all experiments, reaching a maximum peak late in the day. Bluefin tuna larval growth rates were similar despite different alternating conditions whereas the Bonito larvae grew best when provided with light at three hour intervals. In both species, growth under alternating light conditions was similar to the 15 hours continuous light treatment. No differences between the alternating and the continuous light treatments were observed in terms of their survival. Our results suggest that alternating light/feeding periods may have a beneficial effect on ingestion rates; possibly because feeding is less satiation-limited, metabolic costs are lower; or food digestion is more efficient under these conditions. Changes in the light regime, that result in pulse feeding, can thus be an optimal strategy to increase growth at no apparent survival cost in Bonito or bluefin tuna larval cultures.
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Prey selectivity in piscivorous bluefin tuna larvae reared in the laboratory
Journal of Plankton Research, 2014Co-Authors: Patricia Reglero, Aurelio Ortega, Fernando De La Gándara, F. Javier Viguri, Manabu Seoka, Øyvind Fiksen, E Blanco, Arild FolkvordAbstract:Prey size selectivity in piscivorous fish larvae is important to both aquaculture and fisheries science, but laboratory experiments are few. We analyzed selective foraging in Atlantic bluefin tuna larvae ( Thunnus thynnus) using two larval fish prey species. The experiments revealed that selective foraging of prey sizes differed among bluefin tuna predator sizes (15–25 mm SL) and prey species, Bonito ( S arda sarda ) and seabream ( Sparus aurata ). The observed pattern suggest a general preference for small Bonito prey larvae but large seabream prey. Thus, prey size alone is not the only trait responsible for size selectivity in piscivorous fish larvae.
Lippincott Williams Wilkins - One of the best experts on this subject based on the ideXlab platform.
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Correction to: Procedural and Long-Term Outcomes of Bioresorbable Scaffolds Versus Drug-Eluting Stents in Chronic Total Occlusions: The Bonito Registry (Bioresorbable Scaffolds Versus Drug-Eluting Stents in Chronic Total Occlusions)
Circulation. Cardiovascular interventions, 2017Co-Authors: Lippincott Williams WilkinsAbstract:In the article by Azzalini et al, “Procedural and Long-Term Outcomes of Bioresorbable Scaffolds Versus Drug-Eluting Stents in Chronic Total Occlusions: The Bonito Registry (Bioresorbable Scaffolds Versus Drug-Eluting Stents in Chronic Total Occlusions),” which published online October 7, 2016, …
Fernando De La Gándara - One of the best experts on this subject based on the ideXlab platform.
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the effects of light darkness and intermittent feeding on the growth and survival of reared atlantic Bonito and atlantic bluefin tuna larvae
Aquaculture, 2017Co-Authors: E Blanco, Aurelio Ortega, Fernando De La Gándara, Patricia Reglero, Øyvind Fiksen, Arild FolkvordAbstract:Abstract In larval culture, long light photoperiod regimes are used to maximize ingestion rates by increasing the accessibility to prey and therefore enhancing larval growth. Intermittent feeding could provide a viable alternative to the commonly used continuous feeding regimes that aim to improve larval growth and survival. In this study, we investigate the effect of alternating light/darkness regimes with intermittent feeding on the growth and survival of piscivorous larvae of two Scombrid species: Atlantic Bonito, Sarda sarda (Bloch, 1793) and Atlantic bluefin tuna Thunnus thynnus (Linnaeus, 1758) . First we tested if the manipulation of a light regime generated intermittent feeding by analyzing the larval stomach content. Then, we conducted two laboratory experiments to identify the best alternating light regime that maximized larval growth and survival by comparing the results to those obtained using continuous light regimes. The manipulation of light was optimized to provide intermittent feeding opportunities for the larvae, since we discovered a clear interruption of feeding in darkness. An increase in specific ingestion throughout the day was observed in all experiments, reaching a maximum peak late in the day. Bluefin tuna larval growth rates were similar despite different alternating conditions whereas the Bonito larvae grew best when provided with light at three hour intervals. In both species, growth under alternating light conditions was similar to the 15 hours continuous light treatment. No differences between the alternating and the continuous light treatments were observed in terms of their survival. Our results suggest that alternating light/feeding periods may have a beneficial effect on ingestion rates; possibly because feeding is less satiation-limited, metabolic costs are lower; or food digestion is more efficient under these conditions. Changes in the light regime, that result in pulse feeding, can thus be an optimal strategy to increase growth at no apparent survival cost in Bonito or bluefin tuna larval cultures.
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Prey selectivity in piscivorous bluefin tuna larvae reared in the laboratory
Journal of Plankton Research, 2014Co-Authors: Patricia Reglero, Aurelio Ortega, Fernando De La Gándara, F. Javier Viguri, Manabu Seoka, Øyvind Fiksen, E Blanco, Arild FolkvordAbstract:Prey size selectivity in piscivorous fish larvae is important to both aquaculture and fisheries science, but laboratory experiments are few. We analyzed selective foraging in Atlantic bluefin tuna larvae ( Thunnus thynnus) using two larval fish prey species. The experiments revealed that selective foraging of prey sizes differed among bluefin tuna predator sizes (15–25 mm SL) and prey species, Bonito ( S arda sarda ) and seabream ( Sparus aurata ). The observed pattern suggest a general preference for small Bonito prey larvae but large seabream prey. Thus, prey size alone is not the only trait responsible for size selectivity in piscivorous fish larvae.
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the atlantic Bonito sarda sarda bloch 1793 transcriptome and detection of differential expression during larvae development
PLOS ONE, 2014Co-Authors: Elena Sarropoulou, Fernando De La Gándara, Hooman K Moghadam, Nikos Papandroulakis, Aurelio Ortega Garcia, Pavlos MakridisAbstract:The Atlantic Bonito (Sarda sarda, Bloch 1793) belongs to the important marine fish species with a wide geographical distribution covering the Atlantic Ocean, the Mediterranean and its bordering seas. Aquaculture practices for this species are still in their infancies and scientific studies are seldom undertaken, mainly because of difficulties in sampling. Thus for small tuna species like the Atlantic Bonito only little is known about its biology and regarding the molecular background even less information is available. In the production of marine fish it is known that the most critical period is the larval stages, as high growth rates as well as significant developmental changes take place. In this study we have investigated the transcriptome of the Atlantic Bonito of five larvae stages applying Illumina sequencing technology. For non-model species like aquaculture species, transcriptome analysis of RNA samples from individuals using Illumina sequencing technology is technically efficient and cost effective. In the present study a total number of 169,326,711 paired-end reads with a read length of 100 base pairs were generated resulting in a reference transcriptome of 68,220 contigs with an average length of 2054 base pairs. For differential expression analyses single end reads were obtained from different developmental stages and mapped to the constructed reference transcriptome. Differential expression analyses revealed in total 18,657 differentially expressed transcripts and were assigned to five distinguished groups. Each of the five clusters shows stage specific gene expression. We present for the first time in the Atlantic Bonito an extensive RNA-Seq based characterization of its transcriptome as well as significant information on differential expression among five developmental larvae stages. The generated transcripts, including SNP and microsatellite information for candidate molecular markers and gene expression information will be a valuable resource for future genetic and molecular studies.
Jeffrey B Graham - One of the best experts on this subject based on the ideXlab platform.
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swimming performance studies on the eastern pacific Bonito sarda chiliensis a close relative of the tunas family scombridae i energetics
The Journal of Experimental Biology, 2003Co-Authors: C A Sepulveda, Kathryn A Dickson, Jeffrey B GrahamAbstract:SUMMARY A large swim tunnel respirometer was used to quantify the swimming energetics of the eastern Pacific Bonito Sarda chiliensis (tribe Sardini) (45–50 cm fork length, FL ) at speeds between 50 and 120 cm s -1 and at 18±2°C. The Bonito rate of oxygen uptake ( V O 2 )–speed function is U-shaped with a minimum V O 2 at 60 cm s -1 , an exponential increase in V O 2 with increased speed, and an elevated increase in V O 2 at 50 cm s -1 where Bonito swimming is unstable. The onset of unstable swimming occurs at speeds predicted by calculation of the minimum speed for Bonito hydrostatic equilibrium (1.2 FL s -1 ). The optimum swimming speed ( U opt ) for the Bonito at 18±2°C is approximately 70 cm s -1 (1.4 FL s -1 ) and the gross cost of transport at U opt is 0.27 J N -1 m -1 . The mean standard metabolic rate (SMR), determined by extrapolating swimming V O 2 to zero speed, is 107±22 mg O 2 kg -1 h -1 . Plasma lactate determinations at different phases of the experiment showed that capture and handling increased anaerobic metabolism, but plasma lactate concentration returned to pre-experiment levels over the course of the swimming tests. When adjustments are made for differences in temperature, Bonito net swimming costs are similar to those of similar-sized yellowfin tuna Thunnus albacares (tribe Thunnini), but the Bonito has a significantly lower SMR. Because Bonitos are the sister group to tunas, this finding suggests that the elevated SMR of the tunas is an autapomorphic trait of the Thunnini.
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swimming performance studies on the eastern pacific Bonito sardachiliensis a close relative of the tunas family scombridae swimmingperformance studies on the eastern pacific Bonito sarda chiliensis aclose relative of the tunas family scombridae ii ki
The Journal of Experimental Biology, 2003Co-Authors: Hawkins J Dowis, C A Sepulveda, Jeffrey B Graham, Kathryn A DicksonAbstract:The swimming kinematics of the eastern Pacific Bonito Sarda chiliensis at a range of sustained speeds were analyzed to test the hypothesis that the Bonito's swimming mode differs from the thunniform locomotor mode of tunas. Eight Bonito (fork length FL 47.5±2.1 cm, mass 1.25±0.15 kg) (mean ± s.d.) swam at speeds of 50–130 cm s-1 at 18±2°C in the same temperature-controlled water tunnel that was used in previous studies of tunas. Kinematics variables, quantified from 60 Hz video recordings and analyzed using a computerized, two-dimensional motion analysis system, were compared with published data for similar sized tunas at comparable speeds. Bonito tailbeat frequency, tailbeat amplitude and stride length all increased significantly with speed. Neither yaw (6.0±0.6% FL ) nor propulsive wavelength (120±65% fish total length) varied with speed, and there were no mass or body-length effects on the kinematics variables for the size range of Bonitos used. Relative to similar sized yellowfin ( Thunnus albacares ) and skipjack ( Katsuwonus pelamis ) tunas at similar speeds, the Bonito has a lower tailbeat frequency, a higher yaw and a greater stride length. The lateral displacement and bending angle of each intervertebral joint during a complete tailbeat cycle were determined for the Bonito at a swimming speed of 90 cm s-1. The pattern of mean maximum lateral displacement ( z max) and mean maximum bending angle (βmax) along the body in the Bonito differed from that of both chub mackerel Scomber japonicus and kawakawa tuna Euthynnus affinis ; z max was highest in the Bonito. This study verifies that S. chiliensis is a carangiform swimmer and supports the hypothesis that the thunniform locomotor mode is a derived tuna characteristic associated with changes in this group's myotomal architecture. The finding that yaw and z max were greater in the Bonito than in both mackerels and tunas suggests that swimming kinematics in the Bonito is not intermediate between that of tunas and mackerels, as would be predicted on the basis of morphological characteristics.
Kathryn A Dickson - One of the best experts on this subject based on the ideXlab platform.
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swimming performance studies on the eastern pacific Bonito sarda chiliensis a close relative of the tunas family scombridae i energetics
The Journal of Experimental Biology, 2003Co-Authors: C A Sepulveda, Kathryn A Dickson, Jeffrey B GrahamAbstract:SUMMARY A large swim tunnel respirometer was used to quantify the swimming energetics of the eastern Pacific Bonito Sarda chiliensis (tribe Sardini) (45–50 cm fork length, FL ) at speeds between 50 and 120 cm s -1 and at 18±2°C. The Bonito rate of oxygen uptake ( V O 2 )–speed function is U-shaped with a minimum V O 2 at 60 cm s -1 , an exponential increase in V O 2 with increased speed, and an elevated increase in V O 2 at 50 cm s -1 where Bonito swimming is unstable. The onset of unstable swimming occurs at speeds predicted by calculation of the minimum speed for Bonito hydrostatic equilibrium (1.2 FL s -1 ). The optimum swimming speed ( U opt ) for the Bonito at 18±2°C is approximately 70 cm s -1 (1.4 FL s -1 ) and the gross cost of transport at U opt is 0.27 J N -1 m -1 . The mean standard metabolic rate (SMR), determined by extrapolating swimming V O 2 to zero speed, is 107±22 mg O 2 kg -1 h -1 . Plasma lactate determinations at different phases of the experiment showed that capture and handling increased anaerobic metabolism, but plasma lactate concentration returned to pre-experiment levels over the course of the swimming tests. When adjustments are made for differences in temperature, Bonito net swimming costs are similar to those of similar-sized yellowfin tuna Thunnus albacares (tribe Thunnini), but the Bonito has a significantly lower SMR. Because Bonitos are the sister group to tunas, this finding suggests that the elevated SMR of the tunas is an autapomorphic trait of the Thunnini.
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swimming performance studies on the eastern pacific Bonito sardachiliensis a close relative of the tunas family scombridae swimmingperformance studies on the eastern pacific Bonito sarda chiliensis aclose relative of the tunas family scombridae ii ki
The Journal of Experimental Biology, 2003Co-Authors: Hawkins J Dowis, C A Sepulveda, Jeffrey B Graham, Kathryn A DicksonAbstract:The swimming kinematics of the eastern Pacific Bonito Sarda chiliensis at a range of sustained speeds were analyzed to test the hypothesis that the Bonito's swimming mode differs from the thunniform locomotor mode of tunas. Eight Bonito (fork length FL 47.5±2.1 cm, mass 1.25±0.15 kg) (mean ± s.d.) swam at speeds of 50–130 cm s-1 at 18±2°C in the same temperature-controlled water tunnel that was used in previous studies of tunas. Kinematics variables, quantified from 60 Hz video recordings and analyzed using a computerized, two-dimensional motion analysis system, were compared with published data for similar sized tunas at comparable speeds. Bonito tailbeat frequency, tailbeat amplitude and stride length all increased significantly with speed. Neither yaw (6.0±0.6% FL ) nor propulsive wavelength (120±65% fish total length) varied with speed, and there were no mass or body-length effects on the kinematics variables for the size range of Bonitos used. Relative to similar sized yellowfin ( Thunnus albacares ) and skipjack ( Katsuwonus pelamis ) tunas at similar speeds, the Bonito has a lower tailbeat frequency, a higher yaw and a greater stride length. The lateral displacement and bending angle of each intervertebral joint during a complete tailbeat cycle were determined for the Bonito at a swimming speed of 90 cm s-1. The pattern of mean maximum lateral displacement ( z max) and mean maximum bending angle (βmax) along the body in the Bonito differed from that of both chub mackerel Scomber japonicus and kawakawa tuna Euthynnus affinis ; z max was highest in the Bonito. This study verifies that S. chiliensis is a carangiform swimmer and supports the hypothesis that the thunniform locomotor mode is a derived tuna characteristic associated with changes in this group's myotomal architecture. The finding that yaw and z max were greater in the Bonito than in both mackerels and tunas suggests that swimming kinematics in the Bonito is not intermediate between that of tunas and mackerels, as would be predicted on the basis of morphological characteristics.