Tag and recapture of European hake (Merluccius merluccius L.) off the Northwest Iberian Peninsula: First results support fast growth hypothesis

Type Article
Date 2007-12
Language English
Author(s) Pineiro C1, Rey J2, De Pontual HeleneORCID3, Goni R4
Affiliation(s) 1 : Ctr Oceanog Vigo, Inst Espanol Oceanog, Vigo 36200, Spain.
2 : Ctr Oceanog Malaga, Inst Espanol Oceanog, Fuengirola 29640, Spain.
3 : IFREMER, Lab Sclerochronol Animaux Aquat, STH LASAA, F-29280 Plouzane, France.
4 : Ctr Oceanog Baleares, Inst Espanol Oceanog, Palma de Mallorca 07080, Spain.
Source Fisheries Research (0165-7836) (Elsevier), 2007-12 , Vol. 88 , N. 1-3 , P. 150-154
DOI 10.1016/j.fishres.2007.08.015
WOS© Times Cited 37
Keyword(s) Northeast Atlantic, Age estimation, Tag recapture, Growth rates, European hake
Abstract In the first tagging experiment of European hake (Merluccius merluccius L.) conducted off the NW Iberian Peninsula to study hake growth in the wild we released 527 live tagged individuals. The survival rate after capture and tagging was 58%. Mortality during capture was positively correlated with depth of capture and negatively correlated with hake size. Fifteen months after tagging, seven individuals (1.3%) had been recaptured with times at liberty ranging from 29 to 466 days. We provide the first direct measurements of growth rates of Southern stock European hake in the wild and compare them with rates obtained from tagging experiments in other regions and with rates derived from conventional otolith age reading. The mean somatic growth rate of all recaptured hake was 0.032 +/- 0.016 cm day(-1) (sexes combined), while the mean growth rate of the two hake with over 340 days at liberty was 0.052 +/- 0.003 cm day(-1) (sexes unknown). These results indicate that conventional otolith age reading methods overestimate age and underestimate growth. (C) 2007 Published by Elsevier B.V.
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