Abstract
Estimates were made of the predation rate upon eggs of walleye pollock (Theragra chalcogramma) in Shelikof Strait in the western Gulf of Alaska by midwater and near-bottom fish and invertebrate predators during April 1990. Adult and juvenile walleye pollock were the dominant (∼99% of total abundance) planktivores collected in midwater samples. Based on visual inspection of stomach contents, a high percentage of the sampled fish were found to have consumed pollock eggs. Daily egg consumption by older age groups of walleye pollock was estimated to be <1% of the eggs available at all sampling locations. The only other fishes found to consume pollock eggs were flatfishes collected in bottom trawls but their abundances and egg consumption were very low. Gammarid and hyperiid amphipods were important invertebrate predators on eggs in the water column, as determined by immunoassays using antibodies developed specifically to ascertain the presence of pollock egg-yolk protein. Decapod shrimp showed a high proportion of positive assays in near-bottom collections. Invertebrate predators may have consumed up to 4% of the total number of eggs available in the water column, but <1% of the total near the bottom on a daily basis. Although we were not able to account for the entire daily egg mortality estimated for this stock, our method of using a combination of techniques is promising in terms of future attempts at estimating total predation mortality.
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Bailey, K. M., Brodeur, R. D., Merati, N., Yoklavich, M. M. (1993). Predation on walleye pollock (Theragra chalcogramma) eggs and yolk-sac larvae by crustacean invertebrates in the western Gulf of Alaska. Fish. Oceanogr. 2: 30–39
Bailey, K. M., Houde, E. D. (1989). Predation on eggs and larvae of marine fishes and the recruitment problem. Adv. mar. Biol. 25: 1–83
Bailey, K. M., Yen, J. (1983). Predation by the carnivorous marine copepod, Euchaeta elongata Esterly, on eggs and larvae of the Pacific hake, Merluccius productus. J. Plankton Res. 5: 71–82
Brewer, G. D., Kleppel, G. S., Dempsey, M. (1984). Apparent predation on ichthyoplankton by zooplankton and fishes in nearshore waters of southern California. Mar. Biol. 80: 17–28
Brodeur, R. D., Bailey, K. M., Kim, S. (1991). Cannibalism on eggs by walleye pollock Theragra chalcogramma in Shelikof Strait, Gulf of Alaska. Mar. Ecol. Prog. Ser. 71: 207–218
Cochrane, N. A., Sameoto, D., Herman, A. W., Neilson, J. (1991). Multiple-frequency acoustic backscattering and zooplankton aggregations in the inner Scotian Shelf basins. Can. J. Fish. aquat. Sciences 48: 340–355
Dempster, J. P. (1960). A quantitative study of the predators on the eggs and larvae of the broom beetle (Phytodecta olivacea) Forster, using the precipitin test. J. Anim. Ecol. 29: 149–167
Eggers, D. M. (1977). Factors in interpreting data obtained by diel sampling of fish stomachs. Can. J. Fish. aquat. Sciences 44: 1972–1984
Feigenbaum, D. L., Maris, R. C. (1984). Feeding in the Chaetognatha. Ocean. mar. Biol. A. Rev. 22: 343–392
Feller, R. J., Ferguson, R. B. (1988). Quantifying stomach contents using immunoassays: a critique. In: Yentsch, C. M., Mague, F. C., Moran, P. K. (eds.) Immunochemical approaches to coastal, estuarine and oceanographic questions. Springer-Verlag, New York, p. 295–303
Greene, C. H. (1985). Planktivore functional groups and patterns of prey selection in pelagic communities. J. Plankton Res. 7: 35–40
Houde, E. D. (1987). Fish early life dynamics and recruitment variability. Am. Fish. Soc. Symp. 2: 17–29
Hovekamp, S. (1989). Avoidance of nets by Euphausia pacifica in Dabob Bay. J. Plankton Res. 11: 907–924
Hunter, J. R. (1981). Feeding ecology and predation of marine fish larvae. In: Lasker, R. (ed.) Marine fish larvae: morphology, ecology and relation to fisheries. University of Washington Press, Seattle, Wash., p. 33–77
Hunter, J. R. (1984). Inferences regarding predation on the early life stages of cod and other fishes. In: Dahl, E., D. S. Danielssen, E. Moksness, P. Solemdal (eds.) The propagation of cod Gadus morhua L. Institute of Marine Research, Arendal, Norway, p. 533–562
Hunter, J. R., Kimbrell, C. A. (1980). Egg cannibalism in the northern anchovy, Engraulis mordax. Fish. Bull. U. S., 78: 811–816
Iversen, S. A., Danielssen, D. S. (1984). Development and mortality of cod (Gadus morhua L.) eggs and larvae in different temperatures. In: Dahl, E., D. S. Danielssen, E. Moksness, P. Solemdal (eds.) The propagation of cod Gadus morhua L. Institute of Marine Research, Arendal, Norway, p. 49–65
Kear, A. J., Boyle, P. R. (1992). Loss of meal antigenicity during digestion in Sepia officinalis (Cephalopoda: Sepioidea). J. mar. Biol. Ass. U. K. 72: 543–551
Kendall, A. W., Jr., Incze, L. S., Ortner, P. B., Cummings, S. R., Brown, P. K. (1993). The vertical distribution of eggs and larvae of walleye pollock (Theragra chalcogramma) in Shelikof Strait, Gulf of Alaska (In preparation)
Kendall, A. W., Jr., Kim, S. (1989). Buoyancy of walleye pollock (Theragra chalcogramma) eggs in relation to water properties and movement in Shelikof Strait, Gulf of Alsaka. Can. Spec. Publ. Fish. aquat. Sciences 108: 169–180
Kendall, A. W., Jr., Picquelle, S. J. (1990). Egg and larval distributions of walleye pollock (Theragra chalcogramma) in Shelikof Strait, Gulf of Alaska. Fish. Bull. U. S. 88: 133–154
Kim, S., Gunderson, D. R. (1989). Cohort dynamics of walleye pollock in Shelikof Strait, Gulf of Alaska, during the egg and larval periods. Trans. Am. Fish. Soc. 118: 264–273
Kjørsvik, E., Stene, A., Lønning, S. (1984). Morphological, physiological and genetical studies of egg quality in cod (Gadus morhua L.). In: Dahl, E., Danielssen, D. S., Moksness, E., Solemdal, P. (eds.) The propagation of cod Gadus morhua L. Institute of Marine Research, Arendal, Norway, p. 67–86
Laurence, G. C., Rogers, C. A. (1976). Effects of temperature and salinity on comparative embryo development and mortality of Atlantic cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus L.). J. Cons. int. Explor. Mer 36: 220–228
Markle, D. F., Waiwood, K. G. (1985). Fertilization failure in gadids: aspects of its measurement. J. NW. Atlant. Fishery Sci. 6: 87–93
McGurk, M. D. (1986). Natural mortality of marine pelagic fish eggs and larvae: role of spatial patchiness. Mar. Ecol. Prog. Ser. 34: 227–242
Merati, N., Bailey, K. M., Hesler, M., Hara, A. (1993). Developmental changes in egg yolk proteins of walleye pollock (Theragra chalcogramma) and a comparative study of immunoreactivity of other North Pacific teleost and invertebrate eggs. (In preparation)
Möller, H. (1984). Reduction of a larval herring population by a jellyfish predator. Science, N. Y. 224: 621–622
Nissling, A., Westin, L. (1991). Egg mortality and hatching rate of Baltic cod (Gadus morhua) in different salinities. Mar. Biol. 111: 29–32
Picquelle, S. J., Megrey, B. A. (1993). A preliminary spawning biomass estimate of walleye pollock, Theragra chalcogramma, in the Shelikof Strait, Alaska, based on annual egg production. Bull. mar. Sci. (in press)
Purcell, J. E. (1985). Predation on fish eggs and larvae by pelagic cnidarians and ctenophores. Bull. mar. Sci. 37: 739–755
Purcell, J. E. (1989). Predation on fish larvae and eggs by the hydromedusae (Aequorea victoria) at a herring spawning ground in British Columbia. Can. J. Fish. aquat. Sciences 46: 1415–1427
Rijnsdorp, A. D., Jaworski, A. (1990). Size-selective mortality in plaice and cod eggs: a new method in the study of egg mortality. J. Cons. int. Explor. Mer 47: 256–263
SAS Institute, Inc. (1991). SAS user's guide: statistics. 1991 edn. SAS Institute Inc., Cary, North Carolina
Schumacher, J. D., Kendall, A. W., Jr. (1991). Some interactions between young walleye pollock and their environment in the Western Gulf of Alaska. Rep. Calif. coop. ocean. Fish. Invest. (CalCOFI) 32: 22–40
Smith, R. L., Paul, J. M., Paul, A. J. (1989a). Gastric evacuation in walleye pollock, Theragra chalcogramma. Can. J. Fish. aquat. Sciences 46: 489–493
Smith, R. L., Paul, A. J., Paul, J. M. (1989b). Pollock spawning in the Gulf of Alaska: contribution of carbon and energy to the pelagic system. Alaska Sea Grant Rep. AK-SG. 89-01: 645–649 (University of Alaska, Fairbanks)
Theilacker, G. H. (1988). Euphausiid predation on larval anchovy at two contrasting sites off California determined with an ELISPOT immunoassay. In: Yentsch, C. M., Mague, P. C., Moran, P. K. (eds.) Immunochemical approaches to coastal, estuarine and oceanographic questions. Springer-Verlag, New York, p. 304–311
Theilacker, G. H., Kimball, A. S., Trimmer, J. S. (1986). Use of an ELISPOT immunoassay to detect euphausiid predation on larval anchovy. Mar. Ecol. Prog. Ser. 30: 127–131
Theilacker, G. H., Lo, N. C. H., Townsend, A. W. (1993). An immunochemical approach to quantifying predation by euphausiids on the early stages of anchovy. Mar. Ecol. Prog. Ser. 92: 35–50
Walter, C. B., O'Neill, E., Kirby, R. (1986). “ELISA” as an aid in the identification of fish and molluscan prey of birds in marine ecosystems. J. exp. mar. Biol. Ecol. 96: 97–102
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Brodeur, R.D., Merati, N. Predation on walleye pollock (Theragra chalcogramma) eggs in the western Gulf of Alaska: the roles of vertebrate and invertebrate predators. Marine Biology 117, 483–493 (1993). https://doi.org/10.1007/BF00349324
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DOI: https://doi.org/10.1007/BF00349324