Phase transition in recruitment and distribution of monkfish (Lophius piscatorius) in Icelandic waters |
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Authors: | Jon Solmundsson Einar Jonsson Hoskuldur Bjornsson |
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Institution: | (1) Marine Research Institute, Skulagata 4, PO Box 1390, 121 Reykjavik, Iceland |
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Abstract: | The abundance and distribution of monkfish (Lophius piscatorius) at Iceland have increased rapidly in the last decade, concurrent with rising seawater temperatures and salinity. These environmental
changes seem to have improved the reproductive success of the monkfish stock, and since 1998 large cohorts have recruited
almost annually, in great contrast to at least 15 years prior to that. The study indicates that the transition in recruitment
could be mediated by the direct effects of expanded nursery and feeding habitat through elevated temperatures. Other factors
are likely to be involved, such as a more favourable egg and larval drift resulting from a changed inflow of surface water
from spawning to nursery areas. A proportion of the monkfish stock in Icelandic waters may originate from distant areas, either
by means of larval drift or active migration of larger fish. |
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