Scientia Marina, Vol 77, No 1 (2013)

Catch of pelagic hauls in Mediterranean acoustic surveys: Is it the same between day and night?


https://doi.org/10.3989/scimar.03656.21D

Athanassios Machias
Hellenic Centre for Marine Research, Institute of Marine Biological Resources, Greece

Myrto M. Pyrounaki
Hellenic Centre for Marine Research, Institute of Marine Biological Resources, Greece

Iole Leonori
Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Italy

Gualtiero Basilone
Istituto per l’Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche, Italy

Magdalena Iglesias
Instituto Español de Oceanografia, Centro Oceanográfico de Baleares, Spain

Andrea De Felice
Istituto di Scienze Marine, Consiglio Nazionale delle Ricerche, Italy

Angelo Bonanno
Istituto per l’Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche, Italy

Marianna Giannoulaki
Hellenic Centre for Marine Research, Institute of Marine Biological Resources, Greece

Abstract


Fish sampling is a critical aspect of acoustic surveys, because it is directly related to the “transformation” of echo into species biomass and subsequently affects the accuracy of acoustic estimates. In the present study, we investigated the differences between day and night sampling in a) the catch composition through certain diversity indices and b) the length frequency distribution of anchovy and sardine using catch data of pelagic hauls collected from four different regions of the European Mediterranean waters. In addition, the possible bias in trawl efficiency due to sampling time and the possible error introduced in acoustic estimates were investigated. No statistically significant differences were found between day and night in any of the parameters examined. The results showed that a more flexible strategy can be adopted to reduce the duration and the cost of acoustic sampling for small pelagic species. The advantages and disadvantages of the two sampling strategies are discussed.

Keywords


acoustic; pelagic hauls; day-night sampling; Mediterranean Sea; anchovy; sardine

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