Abstract
The biotic and abiotic conditions of the marine ecosystem affect the spawning grounds of fish and therefore the development and behavior of fish larvae in the Ecuadorian coast. During the cruise demersal fishing T 05/11 / 01D of November 2005, 44 zooplankton samples were collected with a simple conical network of 300 micron mesh. Ichthyoplankton distribution indicated a high density of larvae, 8800larvae / 10m2, in front of Muisne and 24 000 and 15 000 eggs / 10m2, in front of Cabuyal and Gulf of Guayaquil, respectively. The area between Cabo San Lorenzo until Cabuyal was the greatest diversity of fish larvae (4.26 bits) related with concentrations of diatoms and dinoflagellates, in an area characterized by mixingfresh water from the Chone River and oceanic warm waters of the Panama bay. The Gulf of Guayaquil was second in ichthyoplanktonic diversity associated with increased zooplankton, especially copepods and cladocerans (3.7 bits).Temperature, salinity, nutrients, and diatoms were the parameters of highest incidence in the distribution of larvae on the coast of Ecuador (r = 0.6 to 0.88). Interrelationships among phosphates, diatoms, zooplankton, fish larvae and adults fishes of Chloroscombrus orqueta, were observed.
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