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North to Alaska: Spawning by Market Squid, Doryteuthis opalescens, in Subarctic Waters
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2021
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Source: Marine Fisheries Review, 83(1-2)
[PDF-1.51 MB]
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Journal Title:Marine Fisheries Review
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Description:Market squid, Doryteuthis opalescens, inhabit nearshore waters along the Pacific coast of North America from Baja California to southeast Alaska, with spawning typically ranging as far north assouthern British Columbia. Increased num- bers of market squid and successive spawn- ing events were observed during 2015–19 in Little Port Walter, a small saltwater bay in southeast Alaska. These observations suggest a recent shift in distribution and, combined with evidence from the 1980’s, suggest that spawning periodically extends into sub- arctic waters. The timing (mid-June to early July) was relatively compressed compared to spawning by southern populations. Wa- ter temperature during this period averaged 10.0oC and was within the lower range re- ported for this species during spawning. Sa- linity was less than normally observed, aver- aging 31.1 ppt. Environmental factors with- in the area have not changed appreciably the late 1990’s–early 2000’s, suggesting that the infrequent observations of market squid and absence of spawning prior to 2015 were not related to local conditions. It is unclear whether the increased abundance and repeated spawning events by market squid over the last several years represent the development of an established popula- tion within southeast Alaska or is the result of continued immigration from areas farther south, although colder water temperatures along the outer coast during 2017–18 were probably less conducive to northerly movements by this species.
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Source:Marine Fisheries Review, 83(1-2)
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Rights Information:Public Domain
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