engleski

Reliability of bluefin tuna tuna size estimates using a stereoscopic camera system

A Stereoscopic camera system was used to measure size of caged bluefin tuna at all Croatian farms, one to two weeks prior to the 2014/2015 harvesting season. Images were recorded in three replicates and stored directly onto a computer hard drive for further review. Precise bluefin size data were obtained at harvesting for comparison against the stereoscopic estimates. The obtained data were analysed for statistical differences using Analysis of Variance. The average 0.8% error in fork length and 2.8% error in weight provide a reliable recording-based estimate of relative fish biomass in the floating cage. There appears to be relationship between farm location and the Fulton condition factor, which could be due to variations in husbandry. The trial demonstrated that it is possible to utilize stereoscopic measurement as a rapid and non-invasive routine tool for obtaining accurate data on the size-frequency distribution of bluefin reared in a grow-out cage. This may benefit both the economic and environmental performance of tuna farming operations, and contribute to the improvement of wild bluefin tuna stock management.

atlantic bluefin tuna ; stereoscopic recordings data ; harvest size measurement ; reliability of size estimates

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