Simulation of Biomass Trends of Eastern Bluefin Tuna (thunnus Thynnus) Stock Under Current Management Regulations
Year: 2011
Type: article
Abstract: [EN] Juvenile catches of bluefin tuna (< 30 kg) have fallen considerably due to present regulations \nfor the eastern stock. Considering past catches of juvenile tuna, large numbers of young tuna \nnow survive and may contribute to future spawning stock. We consider the possibility that these \nmeasures are maintained for the period 2007-2020 and simulate the biomass output provided \nby these tuna that have not been and will not be caught. A stochastic matrix projection model \nwas used. The output from the simulation suggest that by 2010, there will be about one million \nmore tuna of ages 1 to 7 than in 2006 with an increase of about 26,000 tons (95% CI 15.795- \n35.481 tons). By 2020, the population is expected to increase by about 1.6 million of individuals \nof ages up to 17 years which will imply an increase in biomass of 109.178 tons (95% CI \n98.264-118.173 tons) when compared to figures in 2006.
Authors: Eduardo J. Belda, José Luis Cort
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
SDG: Life below water
Open Access status: green
OpenAlex ID: W2152018835