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Use of MEDITS trawl survey data and commercial fleet information for the assessment of some Mediterranean demersal resources

Published online by Cambridge University Press:  15 May 1999

Alvaro Abella
Affiliation:
Agenzia Regionale per la protezione Ambientale della Toscana, Via dell'Ambrogiana 2, 57127 Livorno, Italy
Andrea Belluscio
Affiliation:
Dipartimento di Biologia Animale e dell'Uomo, Università di Roma, Via dell'Università 32, 00184 Rome, Italy
Jacques Bertrand
Affiliation:
Ifremer, B.P. 21105, 44311 Nantes cedex 3, France
Pier Luigi Carbonara
Affiliation:
COISPA Tecnologia e Ricerca, Contrada Padovano, C.P. 62-70042 Mola Di Bari BA, Italy
Daniela Giordano
Affiliation:
Istituto Talassografico C.N.R. Spianata S. Raineri 86, 98122 Messina, Italy
Mario Sbrana
Affiliation:
Centro Interuniversitario di Biologia Marina ed Ecologia Applicata, Piazzale Mascagni 1, 57127 Livorno, Italy
Ada Zamboni
Affiliation:
Istituto di Zoologia, Università di Genova, Via Belbi 5, 16126 Genova, Italy
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Abstract

An assessment of the state of the fisheries of hake, red mullet and Norway lobster was carried out by using trawl survey data from the MEDITS research programme. The assessment was performed by means of the application of a composite model utilising the total mortality rate Z as a direct index of fishing effort. The studied area covered the whole western Italian coast (Ligurian and Tyrrhenian seas) and the eastern coasts of Corsica. The area was divided into twelve sub-areas, considered to be of similar ecological characteristics with similar initial productivity but considered to experience different rates of exploitation. Available information on fishing fleets and their geographic distribution was used in creating sub-areas. For each one of these sub-areas, the total mortality rates and a mean catch per unit of effort were estimated. The estimation of Z was performed by analysing the size structure of the cumulated catch in each sub-area and for each year. Catch rates were estimated as the mean catch per one hour of tow. The positioning of the current values of Z for the different sub-areas relative to the Z at maximum biological production suggests that, in most of the sub-areas, hake is in general fully exploited and red mullet overexploited. In the case of Norway lobster, it was not possible to obtain a statistically acceptable result probably due to a lack of contrasting enough levels of fishing pressure among sub-areas. The results obtained for hake and red mullet are in good agreement with the available information on the consistency of the fleets operating in the different sub-areas.

Type
Research Article
Copyright
© Elsevier, IRD, Ifremer, Cemagref, CNRS, 1999

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Use of MEDITS trawl survey data and commercial fleet information for the assessment of some Mediterranean demersal resources
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