Feeding behavior of the Atlantic mackerel Scomber scombrus on the hydromedusa Aglantha digitale |
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| Authors: | J A Runge P Pepin W Silvert |
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| Institution: | (1) Department of Oceanography, Dalhousie University, B3H 4J1 Halifax, Nova Scotia, Canada;(2) Department of Fisheries and Oceans, Marine Ecology Laboratory, Bedford Institute of Oceanography, P.O. Box 1006, B2Y 4A2 Dartmouth, Nova Scotia, Canada;(3) Present address: GIROQ, Pavillon Vachon, Université Laval, G1K 7P4 Québec, P.Q., Canada;(4) Present address: Department of Fisheries and Oceans, Northwest Atlantic Fisheries Centre, Population Mechanisms Section, P.O. Box 5667, A1C 5X1 St. John's, Newfoundland, Canada |
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| Abstract: | Under laboratory conditions, the Atlantic mackerel Scomber scombrus feed on Aglantha digitale, a small, transparent medusa common in temperate and boreal waters. The same feeding response to A. digitale was observed whether the medusae were offered alone or together with a mixture of copepod prey. A. digitale mortality in the path of the mackerel school is estimated to be near 100%. Median carbon and nitrogen content of A. digitale was equivalent to about ten small copepods (e.g. Pseudocalanus sp.). A. digitale is abundant in temperate-boreal waters and may be an important source of nutrition to mackerel in the northwest Atlantic. |
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