RESUMENEl tiburón perro, Centroscyllium nigrum Garman, 1899, es un representante pequeño de la familia Squalidae que habita en aguas profundas del Pacífico Oriental. Se registra por primera vez un ejemplar hembra adulta en el Pacífico colombiano, capturado mediante trampas en la pesquería del camarón cabezón Heterocarpus hostilis Faxon, 1893, lo cual constituye un importante hallazgo para el área entre el Golfo de Panamá e Islas Galápagos, confirmado su presencia en esta zona. ABSTRACTThe coombtooth dogfish, Centroscyllium nigrum Garman 1899, is a small, deepwater squaloid shark that live in Eastern Pacific. One adult female specimen of C. nigrum, reported for the first time in Colombian Pacific Ocean a specimen was captured by mean trap in fisheries shrimp big-headed Heterocarpus hostilis Faxon, 1893. These report confirms the presence in the zone. This report confirm the presence of this specie in the zone between Panama Gulf and Galapagos Island.

Abstract. Between 1988 and 1998, annual tuna landings at Buenaventura (Colombian Pacific) are correlated with the sea surface temperature in the central Equatorial Pacific (r=0.78, p<0.05) and the sea level height at Buenaventura (r=0.76, p<0.05) and Balboa (Panama) (r=0.79, p<0.05). Seasonal oceanic upwelling is forced by the Panama wind jet, which may favour oceanic fisheries such as tuna. Here we first apply a bivariate correlation method (Pyper and Peterman, 1994) and then a multivariate approach (principal components analysis or PCA) to investigate the relationships of these environmental variables with landings. With the first method, we find that landing is best correlated with the sea surface temperature in the Niño 3 region, whereas the other relationships are less clear. In contrast, with PCA we find that PC1 explains 90.6% of the total variance and suggests that sea surface temperature plays a major role in determining tuna availability in the area (especially during El Niño events). Since PC2 is mainly correlated with sea level height at Balboa but only represents 6.8% of the total variance, we suggest that oceanic upwelling effects on tuna landings at Buenaventura are not significant at interannual scales.

Through a series of ichthyoplankton surveys carried out off central Chile, we characterize the offshore spawning and coastal nursery ground of the bigeye flounder Hippoglossina macrops. Eggs were collected in higher abundances over the continental shelf during late winter, over the shelf-break in mid spring, and at the continental slope in late summer, showing a seasonal depth gradient in spawning. No significant spawning was detected nearshore (less than 8 km offshore). Field data suggest a longitudinal progression from offshore to onshore of larval stages from preflexion to transformation stage. Finally, vertically stratified samples showed that eggs and larvae were present mainly in the upper 100 m. We discuss the potential onshore transport of early life stages of H. macrops through the compensatory flow of Equatorial Subsurface Waters that balances the surface offshore transport in the Ekman layer during upwelling events. Additionally, larval development from yolk-sac to transformation stage is briefly described.

RESUMENLos peces bruja Myxine circifrons Garman 1899 habitan sobre fondos fangosos en la zona preabisal, capturándose principalmente entre los 500 y 1.500 m de profundidad; su distribución geográfica está ligada a las regiones sub-tropicales prefiriendo aguas relativamente frías. Este trabajo registra por primera vez en aguas del océano Pacífico colombiano a 700 m de profundidad la presencia de los agnathos vivientes más primitivos en los océanos del mundo. ABSTRACTThis hagfish species in habiting muddy bottom, between 500 and 1500 m depth; shows a worldwide distribution occupying all sub-tropical oceans, with preference in cold waters. This paper reports the first catch record of Myxine circifrons Garman 1899, from the Colombian Pacific Ocean.

The austral sardine (Sprattus fuegensis) is the target fish resource of a small-scale fishery operating in the Patagonian waters of Chile (41 • 30'S-46 • 00'S). Purse seine boats composed the fleet and landings have fluctuated between 14,344 and 48,589 tons during the period between 2006 and 2014. The stock assessment of the austral sardine utilizes a Statistical Catch-atLength model and this method requires independent estimates of abundance. In order to evaluate the abundance of the austral sardine in the inner sea of the Chilean Patagonia, an acoustic assessment was carried out in Autumn 2013. The study area covered the coastal zone of two administrative regions of Chile, the Los Lagos region in May 2013 and the Aysén region in June 2013. An EK-60 echo sounder permitted to obtain the acoustic data with transducer of 38 and 120 kHz from which echograms were examined to obtain NASC data. A total of 25 fishing set allowed to estimating the species composition and the length structure of the pelagic fish. In addition, fish confined in a jail allowed to estimating the target strength (TS) of the austral sardine. The fishing data and the NASC permitted to evaluate the acoustic biomass of the austral sardine, as well as the biomass of the anchovy (Engraulis ringens) and the common sardine (Strangomera bentincki). The biomass was estimated according to a stratified sampling design, the Gaussian Likelihood Geostatistics technique, and the fit to probability density models. The stratified design included six strata in the Los Lagos region and five strata in the Aysén region, as well as four depth strata (0-50, 50-100, 100-150 and 150-200 m). The stratified estimates of the austral sardine biomass were 118,173 tons (CV=11.6%) in the Los Lagos region and 101,630 tons (CV=9%) in the Aysén region. The estimates of biomass based on Gaussian geostatistics were 122,469 tons (CV=7.6%) in the Los Lagos region and 92,890 (70%) tons in the Aysén region. The best fitting of probability density functions to the acoustic density was log-normal, and allowed to estimate 100,145 tons of austral sardine in the Los Lagos region and 81,965 tons in the Aysén region. The biomass of anchovy was 50,079 tons in the Los Lagos region and 18,668 tons in the Aysén region. The biomass of common sardine was minimal with 5,327 tons in the Los Lagos region only. The estimate of the TS for the austral sardine was -67.59 dB and represented fish between 9 and 17 cm. The study area is spatially heterogeneous, and hydrographical features could determine behaviors of the austral sardine that have not yet described. Therefore, the estimates of biomass here obtained must be regarded as a relative abundance. The basis here obtained will be of importance for monitoring yearly changes in the abundance of the sardine austral.