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| Garcia de la Rosa, S.B.. |
| As a general rule, sharks and rays play an important role in the energy exchanges among higher trophic levels of the marine food chain and some of them, with an important impact as piscivorous predators. Squalus acanthias (Squalidae) and Raja flavirostris (=Dipturus chilensis )(Rajidae), are two elasmobranchs with high apparition frequencies in the SW Atlantic, in the coastal and demersal fishing trawls, co-existing and predating on the principal stocks of bony fish there located, especially the Argentine hake (Merluccius hubbsi). Both species could be transformed into alternative fishing resources, even though they are not currently commercially developed as such. The knowledge on their biology, given in great detail, will provide information for a... |
| Tipo: Theses and Dissertations |
Palavras-chave: Geographical distribution; Abundance; Size distribution; Feeding behaviour; Diets; Interspecific relationships; Predation; Food preferences; Shark fisheries; Geographical distribution; Feeding behaviour; Predation; Food preferences; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6162; Http://aims.fao.org/aos/agrovoc/c_3024. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1487 |
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| Garzón-Ferreira, J.; Reyes-Nivia, M.C.. |
| Based on data recorded in 1994 and 1995 during a basile study carried out at four western Cribbean atolls (Albuquerque, Courtown, Roncador and Serrana) of the San Andrés and Providencia archipelago, the incidence of hard coral predation by fishes and its relation witrh tthe abundance of the parrofishes Sparisoma viride and Scarus vetula was analyzed. Among affected corals, Montastraea annularis and M. faveolata showed the highest inciednce of fish bites (29.5% and 18.7% respectively). There were no significant differences between the atolls on the incidence of coral predation by fishes (Kruskall-Wallis, p=0.07). When comparing between geomorphologic units the lagoon showed the highest level of predation (14.3%), and also the largest populations of S.... |
| Tipo: Journal Contribution |
Palavras-chave: Predation; Predation; Http://aims.fao.org/aos/agrovoc/c_6162. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/3188 |
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| Garcia de la Rosa, S.B.; Sánchez, M.F.. |
| The spiny dogfish, Squalus acanthias is an euribatic, euritermic and cosmopolitan specie. In the Argentine Sea it consumes diversity of preys, characteristic of a generalist and oportunist feeder, butits principal food items are ctenophores, fishes and cephalopods.Diet overlap between sexes was found between 34°-37°S and 101-150 m,where males principally feed on fishes, squid and polichaetes,sharing only ctenophores and hake consumption with the females. Near 62 cm TL there is a shift in the diet, due to an increment of argentine hake Merluccius hubbsi and squid Illex argentinus predation and a diminution in ctenophores Pleurobrachia pileus eating. Feeding shows an increment from north to south, its mode on 42°-43°S.Argentine hake is an important prey... |
| Tipo: Journal Contribution |
Palavras-chave: Feeding behaviour; Predation; Stomach content; Trophic relationships; Feeding behaviour; Predation; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_6162. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/1938 |
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