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Fish Nutrition at the Underwater Mountains of the Whale Ridge (Southeastern Atlantic). 3. Structure of Fish Accumulations and Fish Feeding
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Fish Nutrition at the Underwater Mountains of the Whale Ridge (Southeastern Atlantic). 3. Structure of Fish Accumulations and Fish Feeding
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Journal Article
Fish Nutrition at the Underwater Mountains of the Whale Ridge (Southeastern Atlantic). 3. Structure of Fish Accumulations and Fish Feeding
2023
Overview
Pelagic accumulations of fish are formed above the underwater mountains of the Whale Ridge in the evening and at night, but not observed during daylight hours. The study of such an accumulation above one of the mountains reveals its structure. The central part of the cluster consists of splendid alfonsino
Beryx splendens,
silver scabbardfish
Lepidopus caudatus
and oilfish
Ruvettus pretiosus
tend to keep on the periphery of the splendid alfonsino accumulation
.
Previously, it was found that food of splendid alfonsino, silver scabbardfish, rosefish
Helicolenus mouchezi,
Richardson’s boarfish
Pentaceros richardsoni,
and Cape bonnetmouth
Emmelichthys nitidus
consisted of organisms forming sound-scattering layers (SSL) above the underwater mountains. The composition of food and the daily dynamics of feeding of the listed commercial fish species indicate that they use two feeding tactics. In the first case, rosefish, Richardson’s boarfish, and Cape bonnetmouth forage for most of their food during the day at the bottom, when the SSL-forming organisms descend to the top of the underwater mountain during the diel migration. In the second case, splendid alfonsino, silver scabbardfish, and oilfish as part of a structured pelagic aggregation feed at night on the organisms rising into the upper layers of the water and forming sound-scattering layers. This tactic expands the possibilities for feeding fish that form pelagic aggregations in the dark hours of the day and allows the use of organisms both brought by the current to the mountain top and those that descended here earlier during the diel migration and then stayed until the beginning of the evening.
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