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Environ Biol Fish (2015) 98:11411150 DOI 10.1007/s10641-014-0347-3
Habitat utilization of blackfin tuna, Thunnus atlanticus, in the north-central Gulf of Mexico
Jenny Fenton & Jeffrey M. Ellis & Brett Falterman &
David W. Kerstetter
Received: 12 January 2014 /Accepted: 22 September 2014 /Published online: 26 October 2014 # Springer Science+Business Media Dordrecht 2014
Abstract Short-duration (9.5, 18-, and 28.5-day) deployments of pop-up satellite archival tags (PSATs) on blackfin tuna, Thunnus atlanticus Lesson 1831, were used to evaluate the applicability of external electronic tags on small tunas. Ten tunas (71.1-86.4 cm FL) were tagged in the northern Gulf of Mexico in April 2012 after being caught on typical recreational fishing gear. PSATs recorded point measurements of temperature, pressure (depth), and light level every 90 s (n=2 tags, deployment duration 9.5 days), 180 s (n=4, duration 19 days), or 270 s (n=4, duration 28.5 days). Nine fish survived for their respective full deployment periods; one fish died after only 5 h following release. Depths ranged from 0217 m with a mean of 28 m (SD=8.38 m) and temperatures ranged from 13.932.9 C with a mean of 23.8 C (SD=1.3 C) for all nine archived records. The nine blackfin spent 90 % of
their time in depths from 057 m and 89 % of their time in temperatures from 21.926.6 C. Over 87 % of the movements in the water column, either ascending or descending, were less than 12 m differences in depth between sequential short-duration data sampling. With appropriate concern regarding the matching of fish and PSAT sizes, these results suggest that external tags with fishery-independent reporting capabilities are an available option for smaller tuna species.
Keywords Satellite tagging . Blackfin . Tuna . Gulf of Mexico . Habitat preferences
Introduction
Blackfin tuna, Thunnus atlanticus Lesson, 1831, is a relatively small species that frequently schools with skipjack tuna, Katsuwonus pelamis Kishinouye, 1915, yellowfin tuna, Thunnus albacares Bonnaterre, 1788, and little tunny, Euthynnus alleteratus Rafinesque, 1810 (Taquet et al. 2000), resulting in fisheries interactions throughout their Western Atlantic range. Blackfin, along with the other small tunas, are a main source of food and are highly important to many commercial and recreational fisheries in Cuba (Rawlings 1953), the French West Indies (Taquet et al. 2000), Bermuda (Luckhurst et al. 2001),...