In the oceanic zone of northwestern Mexico (including the Gulf of California), paralarval distribution has been associated with the seasonal and interannual advance and retreat of latitudinal distributions of water masses, the northward transport of warm waters by El Nino-Southern Oscillation, the convergence and front formation of surface water masses, retention through mesoscale eddies, and with adult spawning habitats (Granados-Amores et al.
1), were distributed along the shelf and continental margin of the Gulf of Tehuantepec and in the oceanic zone of transect 1 (Fig.
According to the results obtained, there is intense reproductive activity of squid from May to June in the Gulf of Tehuantepec and the adjacent oceanic zone, with spawning and/or hatching grounds preferentially located in the high Chl-a concentration areas of cyclonic eddies, front zones and coastal areas with high primary production.
The large abundance of small paralarvae over the shelf indicates that Dosidicus gigas and Sthenoteuthis oualaniensis (SD complex) spawned in both the oceanic zone and on the continental shelf of the Gulf of Tehuantepec, as has been reported for other areas (Nigmatullin et al.
The paralarvae trapped in the center of the anticyclonic eddies can be transported through advection toward the oceanic zone and to the southwest out of the coast.
Given its importance as one of the few sources of nutrient enrichment through mesoscale processes in the entire Pacific coast of Central America, as well as the presence of high paralarval abundances, the Gulf of Tehuantepec and the adjacent oceanic zone should be considered a key reproductive region for adults of the species analyzed.
Medium-sized specimens were found in the oceanic zone and large specimens with a high ratio of maturity were found in the coastal zone during winter.
gigas in the oceanic zone off Chilean HCS do not migrate to coastal waters and mature at small sizes (56-63 cm ML; Liu et al.
gigas, assuming that in Chilean waters the squid is reproducing year-round and has two pronounced spawning peaks (winter and summer) that occur in oceanic zones (Clarke & Paliza, 2000; Gonzalez & Chong, 2006; Zuniga et al.