Ecologie alimentaire des Macrouridae Auteur(s) : Geistdoerfer, Patrick Éditeur(s) : ISTPM Résumé : This paper is a study of the feeding ecology of Macrouridae. After Data on their taxonomy and on the stomach contents, the author gives the results obtained: coefficient of vacuity, indication of a prey frequency, percentage in number and in weight, the mean number of prey per stomach, the mean weight of the prey, the alimentary coefficient of a prey. The diet of every species of Macrouridae and the characteristics of feeding in these species are described. He concludes with considerations on the Macrouridae in the ocean and their geographical distribution, and on the deep feeding chain, especially the trophic role of different groups of preys. It is thought that, in the Macrouridae, the alimentary diet is little specialized, and based on benthic and pelagic preys and a tendency to microphagy which can be considered an adaptation to a deep life. Feeding helps determine the area that the fish inhabits at great depths, particularly their vertical distribution which seems to be in direct relation with feeding ecology. Revue des Travaux de l'Institut des Pêches Maritimes (0035-2276) (ISTPM), 1978-09 , Vol. 42 , N. 3 , P. 177-261 Droits : Ifremer http://archimer.ifremer.fr/doc/1978/publication-1957.pdf http://archimer.ifremer.fr/doc/00000/1957/ | Partager |
Age estimation and growth of some deep-sea fish from the northeast Atlantic ocean Auteur(s) : Allain, Valerie Lorance, Pascal Éditeur(s) : Soc Francaise D Ichtyologie Résumé : Age is a necessary parameter used in population dynamics to assess the state of exploited resources. This parameter is poorly known for most deep-sea species (depth > 400 m). This work focused on age estimation from otoliths of Alepocephalus bairdii (Alepocephalidae), Coryphaenoides rupestris (Macrouridae), Helicolenus dactylopterus (Sebastidae) and Hoplostethus atlanticus (Trachichthyidae), which French fishery exploitation, off the west coasts of the British Isles, began the late 1980's. Considering otolith growth zones as annual, the four species all show high longevity: 38, 54, 43 and 130 years, respectively, together with slow growth. The differences in growth between sex were estimated and difficulties in accurately estimating the age were highlighted and showed the need to standardise and validate age estimation. The ages currently estimated for deep-sea fish must be used with caution. Cybium (0399-0974) (Soc Francaise D Ichtyologie), 2000 , Vol. 24 , N. 3 , P. 7-16 Droits : info:eu-repo/semantics/openAccess http://archimer.ifremer.fr/doc/00000/10396/7690.pdf http://archimer.ifremer.fr/doc/00000/10396/ | Partager |