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Evidence of trawling impact on Hoplostethus mediterraneus in the central–eastern Mediterranean Sea

Published online by Cambridge University Press:  16 January 2014

S. Vitale ,
S. Ragonese ,
L. Cannizzaro ,
F. Fiorentino  and
S. Mazzola
S. Vitale*
Affiliation:
Institute for Marine and Coastal Environment–National Research Council (IAMC-CNR), Mazara del Vallo, via L. Vaccara, 61, I-91026 Mazara del Vallo, Italy
S. Ragonese
Affiliation:
Institute for Marine and Coastal Environment–National Research Council (IAMC-CNR), Mazara del Vallo, via L. Vaccara, 61, I-91026 Mazara del Vallo, Italy
L. Cannizzaro
Affiliation:
Institute for Marine and Coastal Environment–National Research Council (IAMC-CNR), Capo Granitola, via del Faro, 3, I-91021 Campobello di Mazara, Italy
F. Fiorentino
Affiliation:
Institute for Marine and Coastal Environment–National Research Council (IAMC-CNR), Mazara del Vallo, via L. Vaccara, 61, I-91026 Mazara del Vallo, Italy
S. Mazzola
Affiliation:
Institute for Marine and Coastal Environment–National Research Council (IAMC-CNR), Mazara del Vallo, via L. Vaccara, 61, I-91026 Mazara del Vallo, Italy
*
Correspondence should be addressed to: S. Vitale, via Luigi Vaccara, 61, I-91026 Mazara del Vallo, TP, Italy email: sergio.vitale@cnr.it
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Abstract

The silver roughy, Hoplostethus mediterraneus is a benthopelagic cosmopolitan fish regularly caught as by-catch of the deep-water crustacean trawl fishery (CTF) in the central–eastern Mediterranean. Monthly samples of silver roughy were sampled from the catches of four commercial trawlers in 2004. Each trawler operated in different fishing grounds (FGs), located off Northern Tunisia, South of Sicily, Malta Islands and in South Levant, for which different exploitation levels are reported. The overall length–frequency distribution (LFD) was constructed, and fishing impact indices (length as percentage of LFD, optimum and maximum length, percentage of mega-spawners and total mortality/von Bertalanffy curvature ratio) were calculated. In spite of an overall acceptable status (juveniles, matures and mega-spawners were present in the catch), sampling data revealed significant differences in LFD shape and status indices between FGs. Those FGs traditionally considered more exploited (Northern Tunisia and South of Sicily) showed a dominance of juveniles, a rarefaction of mega-spawners, a reduction in maximum and asymptotic length and a higher Z/K ratio. Considering the general homogeneity of Mediterranean deep-water habitats, the pelagic dispersal of eggs and the poor swimming capabilities of silver roughy, the present results indicated that deep-water trawling may induce a slow and subtle, although significant, erosion of the older, late maturing and slow growing component of the stocks in the Mediterranean (so-called longevity-overfishing).

Keywords

silver roughydeep-water trawlinglength structurestock statuslongevity overfishingMediterranean Sea
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 3 , May 2014 , pp. 631 - 640
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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