Diet of 0-group stages of capelin (<Emphasis Type="Italic">Mallotus villosus</Emphasis>), herring (<Emphasis Type="Italic">Clupea harengus</Emphasis>) and cod (<Emphasis Type="Italic">Gadus morhua</Emphasis>) during spring and summer in the Barents Sea |
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Authors: | Torstein Pedersen Maria Fossheim |
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Institution: | 1.Department of Aquatic BioSciences, Norwegian College of Fishery Science,University of Troms?,Troms?,Norway |
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Abstract: | Recruitment of capelin in the Barents Sea fail when juvenile herring and cod are abundant and the potential for feeding competition
of wild sympatric capelin and herring larvae and small cod juveniles were investigated. The frequency of gut evacuation after
capture of capelin larvae were also studied in mesocosms. Small capelin larvae (<35 mm length) fed on small prey including
phytoplankton, invertebrate eggs and nauplii, bivalves, other invertebrate larvae and small copepods. Calanus copepodites were only observed in large capelin larvae (>26 mm length). Calanus copepodites were the major food sources for contemporary herring larvae (25–35 mm length) and Calanus and euphausiids were the major prey for small juvenile herring (37–60 mm length) and cod (18–40 mm length). Capelin larvae
reared in mesocosms evacuated the guts shortly after capture. Capelin larvae had a smaller mouth and fed on smaller prey than
herring and cod of the same length. This implies that the small capelin larvae, in contrast to sympatric small herring and
cod, are not tightly linked to the food chain involving Calanus and euphausiids. Thus, exploitative competition between capelin larvae and planktivorous fish that rely on Calanus and euphausiids in the Barents Sea may be relaxed. |
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