Distribución del ictioplancton y zooplancton en la costa ecuatoriana septiembre 1995

Abstract

Between the 6 and 13 of september of 1995, a study about the abundance, distribution of fish eggs and larvae in relation of the abundance and presence of the zooplankton in the Gulf of Guayaquil was carried out. The biggest fish larvae quantity was registered at station 16, 37 and 60 with values 500 and 1000 larvae.(10 m2)-1 which position at was long. 81~'00' - 82~'00'W; lat. 01~'00'S - 3~'04'S while the fish eggs concentration was 500 eggs.(10 m2)-1 at station 21. The smalles fish larvae quantity was registered between 6 and 73 larvae.(10 m2)-1, situated long. 81~'30' - 82~'00'W - lat. 02~'40' - 00~'59'S and 01~'00' south. At north of Gulf near of Puntilla of Santa Elena, Lat. 02~'00'S - Long. 81~'00'W, in the Center of the Ecuadorian coast, near of San Lorenzo cope at station 60 and the South zone near of Saint Clare Island at station 7 were registered fish larvae of commercial concern as Clupeidae, Engraulidae and Scombridae were registered. In the same area higher densities of mesoplanktonic organisms were registered at surface waters, finded 32 groups which values were between 517 and 1183 org.(m3)-1, where more the outstanding were: Cladocers, Quetognates, Copepods, Foraminifers and larvae Gasteropods while in oceanic waters there was less variety of microzooplankton, with values from 272 to 563 org.(m3)-1, 15 zooplanktonic groups were identified, being the most representatives: Foraminifers, Copepods, Cladocers y Quetognats. The highest zooplanktonic biomass concentration was registered at South - east of the Guayaquil Gulf with values from 2 and 7 gr.(100 m3)-1, and the lowest was registered at the North zone of the Ecuadorian coast with value of 1 gr.(100 m3)-1. 36 fish larvae families were identified with 40 gennus and 32 zooplanktonic groups. The fish eggs and larvae abundance was directly related to the zooplanckton presence.