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Sexual identification and development in the swordfish - Improved determination tools for more efficient stock assessment and implementation of control measures

Objective

OBJECTIVES AND EXPECTED ACHIEVEMENTS In the large. socio-economically important, Mediterranean marine fishery for the Swordfish (Xiphias gladius) the determination of sex and gonadal maturity of fishes at capture are important requisites for stock assessment and the controlled regulation of the fishery. This fishery accounts for a yearly financial turnover of well over 300 million EURO within the combined fisheries of the EU.

In many cases sex determination and gonadal maturity of the swordfish cannot be determined due to the lack of external sexual dimorphisms between the sexes or the catch is either "gutted" at sea making sex and gonadal maturation determinations on the landing of the catch impossible. Therefore this data is mainly lacking from present stock assessment exercises. The use of fisheries observers "on board" may be both costly, time-consuming and ineffective when major invasive sampling is forbidden by the fishermen due to the high market value of intact fish.

Coordinator

UNIVERSITAT HEINRICH-HEINE DUSSELDORF
Address
Universitaetsstrasse 1
Dusseldorf
Germany

Participants (4)

INSTITUTO ESPANOL DE OCEANOGRAFIA
Spain
Address
Puerto Pesquero S/n Apartado 285
Fuengirola (Malaga)
NATIONAL & KAPODISTRIAN UNIVERSITY OF ATHENS
Greece
Address
Panepistimiopolis Ilisia
Athens
UNIVERSITA DEGLI STUDI DI BARI
Italy
Address
Via Giovanni Amendola 165/A
Bari
UNIVERSITY OF SHEFFIELD
United Kingdom
Address
Western Bank
Sheffield