Short-term variations in mesozooplankton, ichthyoplankton, and nutrients associated with semi-diurnal tides in a patagonian Gulf

Effects of salinity gradients on larval growth and otolith asymmetry of austral hake Merluccius australis

“…Nonetheless, the level of the stress factors, in the present case, low salinity (as fresh as 1.15) and high turbidity (from 0 to 15 NTU) must be significant to affect OFA, and these stressors may affect differentially to early life stages of epipelagic or benthic species (Grønkjaer & Sand, 2003;Fey & Hare, 2008). Austral hake larvae can be found in the first 100 m depth of the water column, with largest abundances from the surface to 25 m depth (Castro et al, 2011), and therefore it is plausible that larvae experienced fresher and turbid waters.…”

Frequent haplotypes of caged Caligus rogercresseyi in the austral south of Chile: The result of a long term serial passage experiment?

“…Why do planktonic stages prefer to return to a native host if they have an exponentially concentrated chemical signal from the adapted native host (S. salar)? This mechanism may play an important role in maintaining the high infestation rates of C. rogercresseyi in the austral south of Chile, which is an oceanographically complex area where tides have a big influence on planktonic biomass retention and distribution (Castillo et al, 2012;Castro et al, 2011;Ross et al, 2014). Furthermore, the magnitude of the infestation of C. rogercresseyi has followed the expansion of the aquaculture industry; in 2007, prior to the ISA virus epizootia, the aquaculture industry had mostly developed in the Pm and Ch area (northern Patagonia), with 100% infestation in the area (Hamilton-Westa et al, 2012).…”

Larval fish feeding ecology, growth and mortality from two basins with contrasting environmental conditions of an inner sea of northern Patagonia, Chile

“…Horizontal density gradients caused by freshwater input throughout the NB and in the Guafo mouth, may increase accumulation of potential prey field for fish larvae and juvenile (Hinojosa et al, 2010;Castro et al, 2011), increasing the probability of successful foraging by the larvae in the inner sea of Northern Patagonia. In the region of the Desertores Islands, flow is forced mainly by tidal waves (80%, Salinas and Castillo, 2012) the wind over the surface, bottom friction, and estuarine circulation.…”

“…The Patagonian area is also utilized by several marine fish species as a spawning, nursery and feeding zone throughout their life cycle (Bustos et al, 2007Castro et al, 2011;Landaeta et al, 2011). Recent studies in Patagonian fjords have shown that strong surface salinity gradients (from 10 to 32) may have an important impact over growth and recent condition of marine larvae , but surface temperature gradients (from 1.4 to 9.5 C) caused by ice melting near fjord heads do not have the same effect in terms of recent larval growth (Zenteno et al, 2014).…”