The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Antoni Amirowicz - One of the best experts on this subject based on the ideXlab platform.
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genetic composition of a population of natural common bream abramis Brama roach rutilus rutilus hybrids and their morphological characteristics in comparison with parent species
Journal of Fish Biology, 2018Co-Authors: Maciej K Konopinski, Antoni AmirowiczAbstract:: Common bream Abramis Brama, roach Rutilus rutilus and their hybrids were collected in the Dobczyce Reservoir in southern Poland in 2006-2013 to study whether it is better for a hybrid individual to resemble and compete with one of its parents, or to minimize competition by having a distinctive phenotype. All hybrids were F1 crosses and originated predominantly (93·2%) from matings between female A. Brama and male R. rutilus parents. In morphometric analyses, a newly defined coefficient, L3 = 2·5 (body mass) (LS × body depth)-1 , which enables forms with similar length-depth proportions but different length-mass relationships to be distinguished was used. Morphometric and meristic characteristics of the hybrids were intermediate in comparison with the parental species, with small but significant deviation towards R. rutilus in longitudinal body dimensions (trunk and tail length) and towards A. Brama in body cross-sectional shape (body depth and L3 coefficient). This may result in a more R. rutilus like propulsion in hybrids and a more A. Brama like ability to manoeuvre.
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Genetic composition of a population of natural common bream Abramis Brama × roach Rutilus rutilus hybrids and their morphological characteristics in comparison with parent species
Journal of Fish Biology, 2017Co-Authors: Maciej K. Konopiński, Antoni AmirowiczAbstract:: Common bream Abramis Brama, roach Rutilus rutilus and their hybrids were collected in the Dobczyce Reservoir in southern Poland in 2006-2013 to study whether it is better for a hybrid individual to resemble and compete with one of its parents, or to minimize competition by having a distinctive phenotype. All hybrids were F1 crosses and originated predominantly (93·2%) from matings between female A. Brama and male R. rutilus parents. In morphometric analyses, a newly defined coefficient, L3 = 2·5 (body mass) (LS × body depth)-1 , which enables forms with similar length-depth proportions but different length-mass relationships to be distinguished was used. Morphometric and meristic characteristics of the hybrids were intermediate in comparison with the parental species, with small but significant deviation towards R. rutilus in longitudinal body dimensions (trunk and tail length) and towards A. Brama in body cross-sectional shape (body depth and L3 coefficient). This may result in a more R. rutilus like propulsion in hybrids and a more A. Brama like ability to manoeuvre.
Ramachandran Santhanakrishnan - One of the best experts on this subject based on the ideXlab platform.
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Nest trees, habitat and breeding biology of the spotted owlet Athene Brama Brama (Temminck, 1821) in human habitation and agricultural landscape of India
Zoology and ecology, 2015Co-Authors: Ramachandran SanthanakrishnanAbstract:This study examined nest tree, habitat characteristics and breeding biology of the spotted owlet Athene Brama Brama in two habitats, viz. human habitation (HH) and agricultural landscape (AL). From 2008 to 2009, 27 spotted owlet nests (15 in HH and 12 in AL) were observed in Madurai district of southern India. We found that most tree characteristics were significantly different between habitats. The percentage availability of various habitats in a 1-km radius from nest trees varied significantly between HH and AL. The breeding season for spotted owlets started in early January and continued until the end of April. Variations in (a) clutch size, (b) egg dimensions, (c) incubation period, (d) hatching success, (e) brood size, (f) fledgling success, (g) fledgling rate, and (h) breeding success of spotted owlets were observed between HH and AL. We provide photographic documentation of developmental stages of the nestlings.
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diet composition of the barn owl tyto alba aves tytonidae and spotted owlet athene Brama aves strigidae coexisting in an urban environment
Podoces, 2014Co-Authors: Ramachandran SanthanakrishnanAbstract:The comparative diet of the Barn OwlTyto alba and the Spotted Owlet Athene Brama were studied in an urban habitat of Madurai District, Tamil Nadu, Southern India, during January–December 2008. Regurgitated pellets of these two owl species were analysed to ...
Karim Erzini - One of the best experts on this subject based on the ideXlab platform.
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Age and growth of Ray’s bream (Brama Brama) from the south of Portugal
Fisheries Research, 2020Co-Authors: Carina Lobo, Karim ErziniAbstract:Age and growth of 234 Brama Brama Bonnaterre (1788) (Pisces: Bramidae) caught hy semi-pelagic longline off the south coast of Portugal (Algarve) was studied using otoliths for age determination. Samples consisted of fish varying in total length from 32 to 56 cm and in weight from 332 to 2032 g. Age classes from III to XII were represented in the catches. The von Bertalanffy growth curve was fitted and the length/weight relationship was calculated. (C) 2001 Elsevier Science B.V. All rights reserved
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Age and growth of Ray's bream (Brama Brama) from the south of Portugal
2001Co-Authors: Carina Lobo, Karim ErziniAbstract:Abstract Age and growth of 234 Brama Brama Bonnaterre (1788) (Pisces: Bramidae) caught by semi-pelagic longline off the south coast of Portugal (Algarve) was studied using otoliths for age determination. Samples consisted of fish varying in total length from 32 to 56 cm and in weight from 332 to 2032 g. Age classes from III to XII were represented in the catches. The von Bertalanffy growth curve was fitted and the length/weight relationship was calculated.
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The hake deepwater semi-pelagic ("pedra-bola") longline fishery in the algarve (southern Portugal)
Fisheries Research, 2001Co-Authors: Karim Erzini, J. M S Gonçalves, L. Bentes, P. G. Lino, J. RibeiroAbstract:A 2-year study of the European hake (Merluccius merluccius) semi-pelagic ("pedra-bola") longline fishery was carried out in the Algarve (southern Portugal). This fishery takes place on the continental slope at 200-700 m depths, using monofilament longlines that are lifted off the bottom at regular intervals by glass balls. Hook selectivity trials were carried out with four hook sizes (SIAPAL brand numbers 10, 9, 7 and 5) from March to August 1997 and May to August 1998. At least 32 species of fish and invertebrates were caught, with hake dominating the catch (41 and 45% of the catch in numbers), followed by Galeus melastomus (23 and 19%), Micromesistius poutassou (10 and 7%), Benthodesmus elongatus (8 and 5%), Etmopterus pusillus (6 and 9%) and Scyliorhinus canicula (5 and 4%). Apart from the hake, and some species of commercial value such as G. melastomus (only the large individuals), Ray's bream (Brama Brama, 1.4 and 4%), silver scabbard fish (Lepidopus caudatus, 1 and 2.5%), swordfish (Xiphias gladius,
M. R. Ahmadi - One of the best experts on this subject based on the ideXlab platform.
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Intergeneric Hybridization between Kutum, Rutilus frisii kutum, and Bream, Abramis Brama orientalis, of the Caspian Sea
Journal of The World Aquaculture Society, 2007Co-Authors: F. Amini, A A Zamini, M. R. AhmadiAbstract:Artificial hybridization was performed between Rutilus frisii kutum and Abramis Brama orientalis of the Caspian Sea. Synchronization of spawning of female broodstock of both species was induced by injection of carp pituitary extract. Reciprocal crossings between R. frisii kutum ♀×A. Brama orientalis ♂ (RA) and A. Brama orientalis ♀×R. frisii kutum ♂ (AR) produced viable hybrid larvae without any clear particular pre- or postzygotic isolation phenomena. RA and AR hybrid larvae were reared to fingerling stage with survival rates of 22.5 and 28% and average weight of 6.8 ± 0.17 g and 9.0 ± 0.79 g, respectively. A heterosis of 45% was calculated for weight at fingerling stage. RA and AR hybrid fingerlings were cultured in polyculture along with Chinese carps for 6–7 mo and reached an average weight of 190–195 g and 235–255 g, respectively. Karyotyping of these hybrids revealed a modal diploid number of 2n = 50 for both groups, which is similar to those of the parental species. Discriminant function analysis on 28 morphometric and meristic characteristics of two parental species as well as their hybrids could separate these groups at highly significant level (P
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intergeneric hybridization between kutum rutilus frisii kutum and bream abramis Brama orientalis of the caspian sea
Journal of The World Aquaculture Society, 2007Co-Authors: F. Amini, A A Zamini, M. R. AhmadiAbstract:Artificial hybridization was performed between Rutilus frisii kutum and Abramis Brama orientalis of the Caspian Sea. Synchronization of spawning of female broodstock of both species was induced by injection of carp pituitary extract. Reciprocal crossings between R. frisii kutum ♀×A. Brama orientalis ♂ (RA) and A. Brama orientalis ♀×R. frisii kutum ♂ (AR) produced viable hybrid larvae without any clear particular pre- or postzygotic isolation phenomena. RA and AR hybrid larvae were reared to fingerling stage with survival rates of 22.5 and 28% and average weight of 6.8 ± 0.17 g and 9.0 ± 0.79 g, respectively. A heterosis of 45% was calculated for weight at fingerling stage. RA and AR hybrid fingerlings were cultured in polyculture along with Chinese carps for 6–7 mo and reached an average weight of 190–195 g and 235–255 g, respectively. Karyotyping of these hybrids revealed a modal diploid number of 2n = 50 for both groups, which is similar to those of the parental species. Discriminant function analysis on 28 morphometric and meristic characteristics of two parental species as well as their hybrids could separate these groups at highly significant level (P < 0.001). These results indicated an overall intermediate inheritance of the studied characters.
Harry W. Palm - One of the best experts on this subject based on the ideXlab platform.
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Parasite fauna of bream Abramis Brama and roach Rutilus rutilus from a man-made waterway and a freshwater habitat in northern Germany
Diseases of Aquatic Organisms, 2007Co-Authors: Sonja Rückert, Sven Klimpel, Harry W. PalmAbstract:Fifty specimens each of bream Abramis Brama and roach Rutilus rutilus were examined for metazoan parasite fauna and trichodinid ciliates; 25 specimens of each species were collected from the Kiel Canal, a man-made waterway, and a nearby freshwater lake, the Dieksee. This is the first detailed parasitological examination of A. Brama and R. rutilus at these locations: 30 parasite species were found, comprising 4 protozoans, 4 myxozoans, 5 digeneans, 3 monogeneans, 2 cestodes, 6 nematodes, 2 acanthocephalans, 3 crustaceans and 1 hirudinean. The crustacean Caligus lacustris occurred in both habitats while 2 other crustacean species, 2 acanthocephalans and 1 hirudinean were recorded exclusively for the lake habitat. Larval as well as adult stages of the different parasite species were found, indicating that both fish species act as intermediate and final hosts in both habitats. The Kiel Canal (total of 17 parasite species) showed a lower parasite species richness for A. Brama and R. rutilus (14 and 10 parasite species, respectively) than the lake (25 parasite species). A. Brama had a higher parasite richness (22 species) than R. rutilus (16 species) in the lake habitat. Most parasites collected were of freshwater origin. Consequently, the observed infection pattern of both fish species in the waterway is mainly influenced by the limited salinity tolerance of freshwater parasites, which are negatively affected even by a salinity of 2.3 to 4.5. In the central Kiel Canal, neither fish species was infected with marine parasites of low host specifity. These parasites are either limited by the low salinity at this sampling site (
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parasite fauna of bream abramis Brama and roach rutilus rutilus from a man made waterway and a freshwater habitat in northern germany
Diseases of Aquatic Organisms, 2007Co-Authors: Sonja Rückert, Sven Klimpel, Harry W. PalmAbstract:Fifty specimens each of bream Abramis Brama and roach Rutilus rutilus were examined for metazoan parasite fauna and trichodinid ciliates; 25 specimens of each species were collected from the Kiel Canal, a man-made waterway, and a nearby freshwater lake, the Dieksee. This is the first detailed parasitological examination of A. Brama and R. rutilus at these locations: 30 parasite species were found, comprising 4 protozoans, 4 myxozoans, 5 digeneans, 3 monogeneans, 2 cestodes, 6 nematodes, 2 acanthocephalans, 3 crustaceans and 1 hirudinean. The crustacean Caligus lacustris occurred in both habitats while 2 other crustacean species, 2 acanthocephalans and 1 hirudinean were recorded exclusively for the lake habitat. Larval as well as adult stages of the different parasite species were found, indicating that both fish species act as intermediate and final hosts in both habitats. The Kiel Canal (total of 17 parasite species) showed a lower parasite species richness for A. Brama and R. rutilus (14 and 10 parasite species, respectively) than the lake (25 parasite species). A. Brama had a higher parasite richness (22 species) than R. rutilus (16 species) in the lake habitat. Most parasites collected were of freshwater origin. Consequently, the observed infection pattern of both fish species in the waterway is mainly influenced by the limited salinity tolerance of freshwater parasites, which are negatively affected even by a salinity of 2.3 to 4.5. In the central Kiel Canal, neither fish species was infected with marine parasites of low host specifity. These parasites are either limited by the low salinity at this sampling site (<4.5 to 6.0) or they cannot enter the canal due to the environmental conditions prevailing in this artificial brackish water habitat. Thus, the canal may comprise a natural barrier preventing the distribution of North Sea parasites into the Baltic Sea. However, the brackish water Baltic Sea nematodes Paracuaria adunca and Cosmocephalus obvelatus were found in R. rutilus from the canal, demonstrating the ability of some parasite species to invade and extend their range of distribution through this man-made shipping route from the Baltic to the North Sea.