Simple measurements reveal the feeding history, the onset of reproduction, and energy conversion efficiencies in captive bluefin tuna

Jusup, Marko; Klanjšček, Tin; Matsuda, Hiroyuki (2014) Simple measurements reveal the feeding history, the onset of reproduction, and energy conversion efficiencies in captive bluefin tuna. Journal of sea research, 94 . pp. 144-155. ISSN 1385-1101

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Abstract

We present a numerical approach that, in conjunction with a fully set up Dynamic Energy Budget (DEB) model, aims at consistently approximating the feeding history of cultivated fish from the commonly measured aquaculture data (body length, body mass, or the condition factor). We demonstrate the usefulness of the approach by performing validation of a DEB-based model for Pacific bluefin tuna (Thunnus orientalis) on an independent dataset and exploring the implied bioenergetics of this species in captivity. In the context of validation, the results indicate that the model successfully accounts for more than 75% of the variance in actual fish feed. At the 5% significance level, predictions do not underestimate nor overestimate observations and there is no bias. The overall model accuracy of 87.6% is satisfactory. In the context of tuna bioenergetics, we offer an explanation as to why the first reproduction in the examined case occurred only after the fish reached seven years of age, whereas it takes five years in the wild and sometimes as little as three years in captivity. Finally, we calculate energy conversion efficiencies and the supply stress throughout the entire lifetime to theoretically underpin the relatively low contribution of growth to aerobic metabolism implied by respirometry and high feed conversion ratio observed in bluefin tuna aquaculture.

Item Type:	Article
Uncontrolled Keywords:	Aquaculture; Dynamic Energy Budget; Feeding; Maturation; Model validation; Thunnus orientalis
Subjects:	NATURAL SCIENCES > Biology > Zoology NATURAL SCIENCES > Biology > Ecology NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions:	Division for Marine and Enviromental Research
Projects:	Project title Project leader Project code Project type Ecological modelling for sustainable management of resources (Ekološko modeliranje za održivo upravljanje resursima)- Tarzan Legović 098-0982934-2719 MZOS
Depositing User:	Tin Klanjšček
Date Deposited:	05 Nov 2015 13:22
URI:	http://fulir.irb.hr/id/eprint/2215
DOI:	10.1016/j.seares.2014.09.002

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