Introduction and summary of method and results from the tropical stock assessment workshop

1990

Colloque

Polovina J.J., Benco R.A., Carlot Albert, Cillaurren Espérance, Dalzell P., Howard N., Kobayashi D., Latu T.F., Lokani P., Nath G., Pitiale H., Sesewa A., Shomura R., Sua T., Tiroba G., Tulua S.

Polovina J.J. (ed.), Shomura R.R. (ed.), Workshop on tropical fish stock assessment

Honolulu : NOAA, 1990, p. 1-6 (NOAA Technical Memorandum NMFS).

Workshop on Tropical Fish Assessment, Honolulu (Hawaï), 1989/07/5-26

After seven years of exploitation, Vanuatu's deep-bottom fisheries remain at a low level of fishing efforts. It is apparent that catch per unit effort (CPUE) is exponentially correlated to the size of the fishing area. Evaluation of historical catch and effort data show that fishery yields at Paama are beginning to respond to the impact of effort. Estimates of yearly unexploited unexploitable biomass based on the rates of decline in CPUE varied from 32 to 57tons in Paama and 21 to 36 in Ambae. Allen's (1984) model was used for these estimates on rates of natural mortality from 0.25 to 0.50. For an age of recruitment of three years, and a natural mortality of 0.25, ranges of maximal sustainable yield are between 3.4 to 18.3 tons in Paama and between 2.2 and 11.5 tons in Ambae. As annual recorded catches are actually higher without a significant decline in annual catch, this suggests that equilibrium has yet to be achieved. Extrapolation of estimated catch rates per nautical mile of 200 meters isobath (where most fish occurs), to the entire number of nautical miles present in Vanuatu at this depth suggests that maximum sustainable yield isbetween 113.2 to 603.5 tons/year. This biomass could sustain the full time operation of a fleet of 17 to 100 boats, fishing 120 to 150 days per boat/year. (Résumé d'auteur)

Appliquées à la pêche [040INFSTA01]

PECHE DEMERSALE ; ESTIMATION DE STOCK ; METHODOLOGIE ; MODELE MATHEMATIQUE

Fonds IRD [F B35600]

fdi:35600