Pubblicazione scientifica

Towards acoustic discrimination of tropical tuna associated with Fish Aggregating Devices

FILONE TECNOLOGICO	TEMA
economia circolare e sostenibilità

RIASSUNTO

Tropical tuna support some of the largest and most valuable artisanal and industrial fisheries worldwide, conducted to a large degree with Fish Aggregating Devices (FADs). Yellowfin, bigeye and skipjack are the main tuna species found in mixed aggregations around FADs and they are simultaneously encircled by the purse seining operation. One of the key challenges that purse seine fleets fishing with drifting FADs face in all oceans is to be able to target species in healthy condition such as skipjack, while reducing impacts on bigeye and yellowfin in areas where there is a need to reduce fishing pressure on these species. The present paper explores a technical solution for selective fishing at FADs by means of acoustic equipment used by purse seiners. Acoustic frequency response of skipjack and bigeye tuna were determined at 38, 120 and 200 kHz. Skipjack showed stronger response at higher frequencies. On the contrary, bigeye showed stronger responses at lower frequencies. The robust pattern shown in frequency responses of the two species demonstrates the potential to predict abundance and species proportions based on purely acoustic measures. The paper also addresses the conditions that need to be met to successfully apply this technology for selective fishing as well as other uses of direct acoustic observations to support tuna conservation.

DATA

Data di pubblicazione: 05/06/2019

AUTORI

MORENO GALA
BOYRA GUILLERMO
SANCRISTOBAL IGOR
ITANO DAVID
RESTREPO VICTOR

ENTE DI AFFERENZA

INTL SEAFOOD SUSTAINABILITY FNDN ISSF WASHINGTON DC USA
SUSTAINABLE FISHERIES MGMT MARINE RSCH AZTI TECNALIA PASAIA GIPUZKOA SPAIN
SUSTAINABLE MGMT OF FISHERIES COLLECTE LOCALISATION SATELLITES CLS RAMONVILLE SAINT AGNE FRANCE
FISHERIES CONSULTANT HONOLULU HAWAII USA
INST PORTUGUES DO MAR E DA ATMOSFERA PORTUGAL

RIVISTA

PLoS ONE, 14(6), e0216353

IMPACT FACTOR

2,870

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