Distribution and abundance of the Pacific sardine (Sardinops sagax) in the Gulf of California and their relation with the environment

Growth, mortality, recruitment, and yield of the jumbo squid (Dosidicus gigas) off Guaymas, Mexico

“…However, the important point is that with low values of mean abundance and recruitment in the 1997-1998 and 1998-1999 fishing seasons, D. gigas later showed the highest values in mean abundance and recruitment. This surprising fact has been reported for other aquatic species in other regions of the world (Sheridan, 1996;Atkinson et al, 1997;Nevárez-Martínez et al, 2001). There was a considerable decrease in mean abundance and recruitment in the year of the strongest El Niño event of the twentieth century and the following La Niña event, which has been suggested to have had important repercussions in the D. gigas fishery and for other species in the Gulf of California Lluch-Cota et al, 1999) and other places in the world (Waluda et al, 1999;Anderson and Rodhouse, 2001;Rodhouse, 2001).…”

“…The catch of D. gigas observed between 1995-1996 and 2001-2002 showed a high variability, a characteristic that has been observed in this species off Peru (Yamashiro et al, 1998;Taipe et al, 2001) and also in other cephalopod species and in fish and crustaceans (Sakurai et al, 2000;Anderson and Rodhouse, 2001;Nevárez-Martínez et al, 2001;López-Martínez et al, 2003). The decrease in the catch in the 1997-1998 and 1998-1999 seasons was probably related to Table 1 Parameters of the mantle length-mass relationship (a, b), von Bertalanffy model (L ∞ , K, t 0 ), growth performance index (φ ), average mantle length (L m ), mantle length at first capture (L c ), and natural mortality (Jensen, M j , and Pauly, M p , equation) for D. gigas sampled at Guaymas, Mexico Parameter 1995-19971997-19991999-2002 the environmental variability associated with the 1997El Niño and 1998-1999La Niña events (Nevárez-Martínez et al, 1999Lluch-Cota et al, 1999), because there were significant catches in those years in the Pacific Ocean off the coast at Bahia Magdalena, Baja California Sur, Mexico (MoralesBojórquez et al, 2001).…”

Evaluation of the physiological status of the Pacific sardine, Sardinops sagax caeruleus, acclimated to different thermal regimes based on selected blood parameters

“…comm.) and that they actively seek regions of the gulf in which there is persistent upwelling (Hammann et al 1988;Nevárez-Martínez et al 2001).…”

“…The current range of the Pacific sardine (Sardinops sagax caeruleus) extends from British Columbia, Canada, to the southern Pacific coast of the Baja California peninsula and the Gulf of California (McFarlane and Beamish 2001;Nevárez-Martínez et al 2001). Pacific sardines currently support important fisheries off the western coast of North America and within the Gulf of California (Emmett et al 2005;Sweetnam 2006).…”

Poorer breeding by little penguins near Perth, Western Australia is correlated with above average sea surface temperatures and a stronger Leeuwin Current

“…Smithers et al 2003;Peck et al2004;Erwin and Congdon 2007;Valle et al 1987). Higher SSTs have been linked to changes in the recruitment (Cole 1999) and abundance of fish species (Barber and Chavez 1983) and not only affect the distribution and abundance of fish interannually (Nevárez-Martínez et al 2001), but can affect the spatial distribution of fish within a season. Indeed, the daily feeding frequency and meal mass of wedge-tailed shearwater (Puffinus pacificus) and sooty tern (Sterna fuscata) chicks were found to be negatively correlated with daily SST (Peck et al 2004;Erwin and Congdon 2007).…”