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Titolo:
Variability of sardine catch as related to enrichment, concentration, and retention processes in the central Gulf of California
Autore:
Lluch-Cota, SE; Lluch-Cota, DB; Lluch-Belda, D; Nevarez-Martinez, MO; Pares-Sierra, A; Hernandez-Vazquez, S;
Indirizzi:
Ctr Invest Biol Noroeste SC, CIBNOR, La Paz 23000, Baja California, MexicoCtr Invest Biol Noroeste SC La Paz Baja California Mexico 23000 a, Mexico
Titolo Testata:
CALIFORNIA COOPERATIVE OCEANIC FISHERIES INVESTIGATIONS REPORTS
, volume: 40, anno: 1999,
pagine: 184 - 190
SICI:
0575-3317(199910)40:<184:VOSCAR>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
OF-CALIFORNIA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Lluch-Cota, SE Ctr Invest Biol Noroeste SC, CIBNOR, Apartado Postal 128, La Paz 23000, Baja California, Mexico Ctr Invest Biol Noroeste SC Apartado Postal 128 La Paz Baja California Mexico 23000
Citazione:
S.E. Lluch-Cota et al., "Variability of sardine catch as related to enrichment, concentration, and retention processes in the central Gulf of California", CAL C O F I, 40, 1999, pp. 184-190

Abstract

The sardine (Sardinops sagax) fishery of the Gulf of California is among Mexico's most important fisheries, accounting for the largest catch and providing many productive jobs. During the early 1990s, this fishery collapsed to less than 3% of the production maximum. Surprisingly, after two years ofvery low catch the fishery recovered quickly. We propose that these large fluctuations may be explained mainly by physical processes (enrichment, retention, and concentration) governing the sardine spawning habitat. The spawning area may be influenced by processes such as tidal mixing, winter northwesterly winds, coastal upwelling, prevailing surface currents, and Ekman transport, but most of its variability is believed to be wind-forced. Therefore we attempted to relate spawning extension to wind variations. By fitting an equation that expresses spawning as a probability function of a wind-derived index, we have built a spawning-probability time series based on eggand larval survey data and then tested against an independent series of landings and biomass indices (number of recruits and adults). Results show coherent relations between the spawning-probability series and the biologicaland fisheries data, despite large fluctuations (collapse and recovery). Our results are encouraging and may provide a solid theoretical basis for future environment-monitoring systems for the sardine fishery in the gulf.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 16:07:55