Feeding Habits and Biological Features of Deep-Sea Species of the Northwest Atlantic: Large-eyed Rabbitfish (Hydrolagus mirabilis), Narrownose Chimaera (Harriotta raleighana) and Black Dogfish (Centroscyllium fabricii)

摘要: Feeding habits and biological features of three deep-water species -large-eyed rabbitfish (Hydrolagus mirabilis), narrownose chimaera (Harriotta raleighana) black dogfish (Centroscyllium fabricii)distributed in the Grand Bank Flemish Cap (Northwest Atlantic) were analyzed. Both chimaeroid fed on endo epi-benthic organisms, but with different behavior. Narrownose showed a closer relationship sea bed feeding habits, denoted mainly by high polychaete sediment presence; while large-eyed rabbitfish, great importance pelagic prey (Coryphaenoides rupestris cephalopods) would indicate wider increased predator size. Black preyed mostly benhopelagic (crustaceans, scyphozoans fish). High infestation Gyrocotyle affected species, increasing depth. The parasitation 67% higher percentage for smaller individuals; (84% parasites) had greater number parasites per host, bigger individuals more affected. However, presence did not seem to harm well-being specimens. Length-weight indicated body weight males small sizes 108, 31.5 50 cm respectively. body-eviscerated weigh show differences between sexes. hepatosomatic index (HIS) was all (31.3%) it reached other value around fourth part their eviscerated weight. clear increase HSI weight, chimaerids presented variation.