Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption of Atlantic menhaden (Brevoortia tyrannus)
Diet, gastric evacuation rates, daily ration, and population-level prey demand of bluefin tuna (Thunnus thynnus) were estimated in the continental shelf waters off North Carolina. Bluefin tuna stomachs were collected from commercial fishermen during the late fall and winter monthsof 2003–04, 2004–05, and 2005–06. Diel patterns in mean gut fullness values were used to estimate gastric evacuation rates. Daily ration determined from mean gut fullness values and gastric evacuation rates was used, along with bluefin tuna population size and residency times, to estimate population-level consumption by bluefin tuna on Atlantic menhaden (Brevoortia tyrannus). Bluefin tuna diet (n= 448) was dominated by Atlantic menhaden; other teleosts,portunid crabs, and squid were of mostly minor importance. The time required to empty the stomach after peak gut fullness was estimated to be ~20 hours. Daily ration estimates were approximately 2% of body weight per day. At current western Atlantic population levels, bluefin tuna predation on Atlantic menhaden is minimal compared to predation by other known predators and the numbers taken in commercial harvest. Bluefin tuna appear to occupy coastal waters in North Carolina during winter to prey upon Atlantic menhaden. Thus, changes in the Atlantic menhadenstock status or distribution would alter the winter foraging locations of bluefin
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Online Access: | http://hdl.handle.net/1834/25416 |
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dig-aquadocs-1834-254162021-06-27T01:48:41Z Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption of Atlantic menhaden (Brevoortia tyrannus) Butler, Christopher M. Rudershausen, Paul J. Buckel, Jeffrey A. Biology Ecology Fisheries Diet, gastric evacuation rates, daily ration, and population-level prey demand of bluefin tuna (Thunnus thynnus) were estimated in the continental shelf waters off North Carolina. Bluefin tuna stomachs were collected from commercial fishermen during the late fall and winter monthsof 2003–04, 2004–05, and 2005–06. Diel patterns in mean gut fullness values were used to estimate gastric evacuation rates. Daily ration determined from mean gut fullness values and gastric evacuation rates was used, along with bluefin tuna population size and residency times, to estimate population-level consumption by bluefin tuna on Atlantic menhaden (Brevoortia tyrannus). Bluefin tuna diet (n= 448) was dominated by Atlantic menhaden; other teleosts,portunid crabs, and squid were of mostly minor importance. The time required to empty the stomach after peak gut fullness was estimated to be ~20 hours. Daily ration estimates were approximately 2% of body weight per day. At current western Atlantic population levels, bluefin tuna predation on Atlantic menhaden is minimal compared to predation by other known predators and the numbers taken in commercial harvest. Bluefin tuna appear to occupy coastal waters in North Carolina during winter to prey upon Atlantic menhaden. Thus, changes in the Atlantic menhadenstock status or distribution would alter the winter foraging locations of bluefin 2021-06-24T16:20:12Z 2021-06-24T16:20:12Z 2010 article TRUE 0090-0656 http://hdl.handle.net/1834/25416 en http://fishbull.noaa.gov/1081/butler.pdf application/pdf application/pdf 56-69 http://aquaticcommons.org/id/eprint/8767 403 2012-06-10 09:01:56 8767 United States National Marine Fisheries Service |
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Biology Ecology Fisheries Biology Ecology Fisheries Butler, Christopher M. Rudershausen, Paul J. Buckel, Jeffrey A. Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption of Atlantic menhaden (Brevoortia tyrannus) |
description |
Diet, gastric evacuation rates, daily ration, and population-level prey demand of bluefin tuna (Thunnus thynnus) were estimated in the continental shelf waters off North Carolina. Bluefin tuna stomachs were collected from commercial fishermen during the late fall and winter monthsof 2003–04, 2004–05, and 2005–06. Diel patterns in mean gut fullness values were used to estimate gastric evacuation rates. Daily ration determined from mean gut fullness values and gastric evacuation rates was used, along with bluefin tuna population size and residency times, to estimate population-level consumption by bluefin tuna on Atlantic menhaden (Brevoortia tyrannus). Bluefin tuna diet (n= 448) was dominated by Atlantic menhaden; other teleosts,portunid crabs, and squid were of mostly minor importance. The time required to empty the stomach after peak gut fullness was estimated to be ~20 hours. Daily ration estimates were approximately 2% of body weight per day. At current western Atlantic population levels, bluefin tuna predation on Atlantic menhaden is minimal compared to predation by other known predators and the numbers taken in commercial harvest. Bluefin tuna appear to occupy coastal waters in North Carolina during winter to prey upon Atlantic menhaden. Thus, changes in the Atlantic menhadenstock status or distribution would alter the winter foraging locations of bluefin |
format |
article |
topic_facet |
Biology Ecology Fisheries |
author |
Butler, Christopher M. Rudershausen, Paul J. Buckel, Jeffrey A. |
author_facet |
Butler, Christopher M. Rudershausen, Paul J. Buckel, Jeffrey A. |
author_sort |
Butler, Christopher M. |
title |
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption
of Atlantic menhaden (Brevoortia tyrannus) |
title_short |
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption
of Atlantic menhaden (Brevoortia tyrannus) |
title_full |
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption
of Atlantic menhaden (Brevoortia tyrannus) |
title_fullStr |
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption
of Atlantic menhaden (Brevoortia tyrannus) |
title_full_unstemmed |
Feeding ecology of Atlantic bluefin tuna (Thunnus thynnus) in North Carolina: diet, daily ration, and consumption
of Atlantic menhaden (Brevoortia tyrannus) |
title_sort |
feeding ecology of atlantic bluefin tuna (thunnus thynnus) in north carolina: diet, daily ration, and consumption
of atlantic menhaden (brevoortia tyrannus) |
publishDate |
2010 |
url |
http://hdl.handle.net/1834/25416 |
work_keys_str_mv |
AT butlerchristopherm feedingecologyofatlanticbluefintunathunnusthynnusinnorthcarolinadietdailyrationandconsumptionofatlanticmenhadenbrevoortiatyrannus AT rudershausenpaulj feedingecologyofatlanticbluefintunathunnusthynnusinnorthcarolinadietdailyrationandconsumptionofatlanticmenhadenbrevoortiatyrannus AT buckeljeffreya feedingecologyofatlanticbluefintunathunnusthynnusinnorthcarolinadietdailyrationandconsumptionofatlanticmenhadenbrevoortiatyrannus |
_version_ |
1756078026869702656 |