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Updated reproductive parameters for the shortfin mako, Isurus oxyrinchus, in the North Atlantic with inferences of distribution by sex and reproductive stage
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2020
Source: Fishery Bulletin, 118(1)
Details:
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Journal Title:Fishery Bulletin
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Personal Author:
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NOAA Program & Office:
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Description:Prompted by recent concern about the stock status of the shortfin mako (Isurus oxyrinchus) in the
North Atlantic Ocean, we examined
reproductive data from 731 individuals
(351 females and 380 males) collected
by 3 scientific organizations to improve
estimates of size and age at maturity.
Males ranged in size from 70 to 283 cm
fork length (FL) and females from
71 to 338 cm FL. Females matured
between 263 and 291 cm FL, with an
estimated median length at maturity
(L50) of 280 cm FL and a median weight
at maturity (WT50) of 275 kg. Males
matured between 173 and 187 cm FL,
with an L50 of 182 cm FL and WT50 of
64 kg. Catch records from 4 international programs were also examined
to investigate spatiotemporal variation
in the distribution of life history stages
based on updated size-at-maturity estimates and to identify potential parturition and nursery grounds. These
records identified the Gulf of Mexico
and the eastern North Atlantic Ocean
off Portugal as birthing and nursery
areas, with the most important nursery
area occurring in the western North
Atlantic Ocean.
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Keywords:
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Source:Fishery Bulletin, 118(1)
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Document Type:
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Place as Subject:
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Rights Information:Public Domain
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Compliance:Submitted
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