Scientia Marina, Vol 66, No S2 (2002)

Distribution of Mullus barbatus and M. surmuletus (Osteichthyes: Perciformes) in the Mediterranean continental shelf: implications for management


https://doi.org/10.3989/scimar.2002.66s239

George Tserpes
Institute of Marine Biology of Crete, Greece

Fabio Fiorentino
Istituto di ricerche sulle Risorse Marine a l’Ambiente (IRMA-CNR), Portugal

Dino Levi
Istituto di ricerche sulle Risorse Marine a l’Ambiente (IRMA-CNR), Italy

Angelo Cau
Dipartimento di Biologia Animale ed Ecologia, Italy

Matteo Murenu
Dipartimento di Biologia Animale ed Ecologia, Italy

Ada Zamboni
Dipartimento per lo Studio della Terra e delle sue Risorse, Laboratori di Biologia Marina ed Ecologia Animale, Italy

Costas Papaconstantinou
National Centre for Marine Research, Greece

Abstract


The present work attempts to study the spatio-temporal distribution of Mullus barbatus and M. surmuletus in the Mediterranean Sea by using a time series of data from an international bottom trawl survey that covered a wide area of the Mediterranean Sea. The experimental surveys were accomplished annually from 1994 to 2000 on approximately 1000 pre-defined sampling stations distributed in 15 major areas. Selection of stations was based on a depth-stratified random sampling scheme that included five depth strata: 10-50, 50-100, 100-200, 200-500 and 500-800 m. The examined species were found throughout the studied region, mostly in depths down to 200 m. Abundance differences among major areas were found to be statistically significant and were attributed to the different exploitation patterns, as well as the different abiotic and biotic conditions prevailing in each area. Although both species undergo high fishing pressure, results did not demonstrate any decreasing trends in their abundance indices suggesting the existence of a good stock-recruitment relationship over the studied period. However, the dominance of young fish that has been found, makes the stocks highly vulnerable to recruitment changes; hence protection of spawning and nursery areas seems to be essential for their conservation.

Keywords


red mullet; striped red mullet; Mullus barbatus; Mullus surmuletus; distribution; Mediterranean

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