Author:
McDowell Jan R.,Bravington Mark,Grewe Peter M.,Lauretta Matthew,Walter John F.,Baylis Shane M.,Gosselin Thierry,Malca Estrella,Gerard Trika,Shiroza Akihiro,Lamkin John T.,Biesack Ellen E.,Zapfe Glenn,Ingram Walter,Davies Campbell,Porch Clay
Abstract
AbstractGlobally, tunas are among the most valuable fish stocks, but are also inherently difficult to monitor and assess. Samples of larvae of Western Atlantic bluefin tuna Thunnus thynnus (Linnaeus, 1758) from standardized annual surveys in the northern Gulf of Mexico provide a potential source of “offspring” for close-kin mark-recapture (CKMR) estimates of abundance. However, the spatial patchiness and highly skewed numbers of larvae per tow suggest sampled larvae may come from a small number of parents, compromising the precision of CKMR. We used high throughput genomic profiling to study sibship within and among larval tows from the 2016 standardized Gulf-wide survey compared to targeted sampling carried out in 2017. Full- and half-siblings were found within both years, with 12% of 156 samples in 2016 and 56% of 317 samples in 2017 having at least one sibling. There were also two pairs of cross cohort half-siblings. Targeted sampling increased the number of larvae collected per sampling event but resulted in a higher proportion of siblings. The combined effective sample size across both years was about 75% of the nominal size, indicating that Gulf of Mexico larval collections could be a suitable source of juveniles for CKMR in Western Atlantic bluefin tuna.
Funder
Pew Charitable Trusts
NOAA RESTORE Science Program
Cooperative Institute for Marine and Atmospheric Studies
Publisher
Springer Science and Business Media LLC
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