banner biblioteca

Bycatch of the Southern King Crab (Lithodes santolla) in the Patagonian shrimp fishery in the Southwestern Atlantic Ocean. Can it contribute to the depletion of its population?

By: Varisco, Martín
Contributor(s): Cochia, Pablo | Gongora, María Eva | Bovcon, Nelson | Balzi, Pamela | Vinuesa, Julio
Material type: TextTextLanguage: English Description: pp. 177-184ISSN: 0964-5691Subject(s): Océano Atlántico | Cangrejo Real del Sur | Lithodes santolla | Camarón In: Ocean & Coastal Management Vol. 136 pp. 177-184Summary: The Southern King Crab (SKC), Lithodes santolla, has supported a growing fishery in San Jorge Gulf (Patagonia, Argentina) since 2011. This fishery is developed by vessels called crabbers. SKC is also caught as bycatch in the Patagonian shrimp fishery, a major crustacean fishery in the Southwestern Atlantic Ocean. In this work, we characterized SKC bycatch in shrimp fishery and compared 1994e1996 data (which reflected little fishing impact) and 2011e2012 data (at the beginning of the current SKC fishery by crabbers in San Jorge Gulf), to determine the particular effects of bycatch on the SKC population. The frequency of occurrence of SKC in shrimp hauls was 84.08%. However, the relative abundance was low, in most of the hauls SCK represented less than 5% of the capture. Between 2006 and 2011, the estimated SKC bycatch was 2432 tn/year. Frequency of occurrence and abundance were higher in the same area where crabbers operate. SKC bycatch is commonly discarded, but, in 18% of the hauls, SKC are processed on board, although this is illegal. Mortality estimated at the beginning of handling was 19%, but this value may be greater due to the long time of onboard handling. SKC bycatch include critic stages of its life cycle such as juveniles, ovigerous females and molting individuals. Juveniles represented 26.9% of the total SKC bycatch, while ovigerous females represented 28.1%. Sex ratios and male size showed no differences between 1994e1996 and 2011e2012, whereas the proportion of ovigerous females decreased between both periods. This decrease can be related to the interference of trawlings in their reproductive migration to coastal waters or in their mating grounds. We consider that the main problem of SKC bycatch is the detrimental effects on its reproductive potential due to the increase in the proportion of non-ovigerous females and the mortality of ovigerous females along with extensive handling, which can also result in a significant egg loss.
Tags from this library: No tags from this library for this title. Log in to add tags.
    Average rating: 0.0 (0 votes)
Item type Current location Collection Call number Copy number Status Date due Barcode
Revista Revista Biblioteca Central
Hemeroteca Vol. 136 (2017) Available

The Southern King Crab (SKC), Lithodes santolla, has supported a growing fishery in San Jorge Gulf
(Patagonia, Argentina) since 2011. This fishery is developed by vessels called crabbers. SKC is also caught
as bycatch in the Patagonian shrimp fishery, a major crustacean fishery in the Southwestern Atlantic
Ocean. In this work, we characterized SKC bycatch in shrimp fishery and compared 1994e1996 data
(which reflected little fishing impact) and 2011e2012 data (at the beginning of the current SKC fishery by
crabbers in San Jorge Gulf), to determine the particular effects of bycatch on the SKC population. The
frequency of occurrence of SKC in shrimp hauls was 84.08%. However, the relative abundance was low, in
most of the hauls SCK represented less than 5% of the capture. Between 2006 and 2011, the estimated SKC
bycatch was 2432 tn/year. Frequency of occurrence and abundance were higher in the same area where
crabbers operate. SKC bycatch is commonly discarded, but, in 18% of the hauls, SKC are processed on
board, although this is illegal. Mortality estimated at the beginning of handling was 19%, but this value
may be greater due to the long time of onboard handling. SKC bycatch include critic stages of its life cycle
such as juveniles, ovigerous females and molting individuals. Juveniles represented 26.9% of the total SKC
bycatch, while ovigerous females represented 28.1%. Sex ratios and male size showed no differences
between 1994e1996 and 2011e2012, whereas the proportion of ovigerous females decreased between
both periods. This decrease can be related to the interference of trawlings in their reproductive migration
to coastal waters or in their mating grounds. We consider that the main problem of SKC bycatch is the
detrimental effects on its reproductive potential due to the increase in the proportion of non-ovigerous
females and the mortality of ovigerous females along with extensive handling, which can also result in a
significant egg loss.

There are no comments on this title.

to post a comment.

Todos los derechos reservados Invemar

Sede Principal: Calle 25 No. 2-55, Playa Salguero,Santa Marta D.T.C.H., Colombia
Teléfonos: +57-5-4328600/ Fax: +57-5-4328694
Horario de Atención: Lunes a Viernes; 7:00 a.m.-11:30 a.m. y de 1:00 p.m.-5:00 p.m.
Otras sedes. Directriz de Privacidad.

Todos los Derechos Reservados

Powered by Koha