Comparative Study of the Intensity of Feeding of Cod (Gadus morhua) off Newfoundland and of the
In stocks experiencing intensive fisheries, the quantitative assessment of food con-sumption is important in understanding the trophic interrelationships. As an example it has been reported that exploitation of the planktophage capelin stock in the Barents Sea resulted in the loss of the stable food...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.549.1595 http://archive.nafo.int/open/studies/s18/orlova.pdf |
| Summary: | In stocks experiencing intensive fisheries, the quantitative assessment of food con-sumption is important in understanding the trophic interrelationships. As an example it has been reported that exploitation of the planktophage capelin stock in the Barents Sea resulted in the loss of the stable food base of the Arcto-Norwegian cod. The period of the sharpest decline in capelin abundance (1987-88) was followed by transition of food consumption of cod to the young of commercial fish and other small non-commercial fish and crustaceans. Consequently, changes were noted in some biological conditions of cod (Orlova et al., 1990a). Food consumption investigations formed the basis for the construction of multi-type models in this study. The Arcto-Norwegian cod distribution is close to that of the Newfound-land cod, and hence similarities in rate of growth and sexual maturing, and also hydrological conditions and food composition, with the exception of sand eel (Ammodytes sp.), are known (Popova, 1962; Turuk, 1973, 1976; Lilly, 1987). This permitted the comparison of the intensity of feeding of cod of both stocks. A comparative analysis of the results of calculations of daily |
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