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Unformatted text preview: Epipelagic Zone Less than 2 % of known species occupy this featureless zone Low habitat diversity and low nutrient levels support few fish Concentrations above continental shelves or near upwelling Most are in the upper 100m Despite low species and habitat diversity, they are valuable because of enormous numbers and culinary favor Adaptations for Pelagic Life Typified by Dolphin fish, salmon, tuna, anchovy, sardines and many sharks Streamlining permits continuous rapid swimming Most school and are visual predators Adaptations for Pelagic Life ... Both predator and prey are silvery and countershaded Filter feeders have long fine gill rakers, but many can selectively pick individual prey out of the water Largest (whale & basking sharks) and smallest (anchovies) adult epipelagic species are filter feeders Ecological Types Oceanic and neritic (over continental shelf/slope) forms Some oceanic forms are associated with drifting seaweed, especially young Partial residents include salmon (fw migrants) and lanternfishes (vertical migrants) True residents spend entire life cycle in oceanic zone Ecological Types ... Neritic epipelagic fishes are among the most abundant species including herring, sardines, anchovies, and menhaden and their predators: sharks, tunas, mackerel, jacks, billfish, and salmon These species are most abundant near points of HIGH primary productivity Factors that Affect Distribution...
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This note was uploaded on 09/13/2010 for the course OCS 4012 taught by Professor Baltz,d during the Spring '08 term at LSU.
- Spring '08