| Food habits of the important groundfishes in the Aleutian Islands in 1994 and 1997 - :11969 | National Marine Fisheries Service (NMFS)
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Food habits of the important groundfishes in the Aleutian Islands in 1994 and 1997
  • Published Date:
    2003
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Food habits of the important groundfishes in the Aleutian Islands in 1994 and 1997
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  • Corporate Authors:
    Alaska Fisheries Science Center (U.S.)
  • Description:
    A total of 6, 558. stomachs from 31 species were analyzed to describe the food habi ts of the maj or groundfish species in the Aleutian Islands area in 1994 and 1997. The analysis emphasized groundfish predation on commercially important fish, crab, and shrimp. The percent similarity index (PSI) was calculated to show the diet overlap between groundfish species in the Aleutian Islands area in 1994 and 1997. The sizes of prey fish and crab consumed by each predator species were studied. Pacific cod, arrowtooth flounder, Pacific halibut, Greenland turbot, Alaska skate, whi te blotched skate, great sculpin, bigmouth sculpin, giant grenadier, and rougheye rockfish were the main piscivores. Walleye pollock, Atka mackerel, and myctophids were the dominant prey fish. The main predators that fed on Tanner crabs were Pacific halibut, Pacific cod, and great sculpin. Pacific cod, arrowtooth flounder, shortraker rockfish, rougheye rockfish, short spine thornyhead, Aleutian skate, Bering skate, and darkfin sculpin were the main consumers of pandalid shrimp. Atka mackerel, Pacific ocean perch, northern rockfish, walleye pollock, spectacled sculpin, and northern lampfish fed mainly on zooplankton (mainly euphausiids and calanoid copepods) Rock soles, mud skate, roughtail skate, Bering skate, and darkfin sculpin were benthic and epi-benthic feeders; they fed mainly on polychaetes and gammarid amphipods. Flathead sole was the bri ttle star feeder, though they also fed on miscellaneous shrimp and polychaetes. Prowfish fed on gelatinous prey such as jellyfish, ctenophores, and pelagic salps. Sablefish also fed on large amount of salps; however, they also fed on euphausiids and cephalopods.

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