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Primer registro para Chile de las diatomeas marinas Nitzschia amabilis, Nitzschia elegantula y Chaetoceros muelleri var. subsalsum

RESEARCH NOTE

Ciclo reproductivo y fecundidad parcial de Isacia conceptionis (Perciformes, Haemulidae) en La Herradura, Coquimbo, Chile

Authors

CORRESPONDING

Niris Cortés

ncortes@ucn.cl

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1

Escuela de Prevención de Riesgos y Medio Ambiente, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo 1281, Casilla 117, Coquimbo, Chile

Alejandro Aron

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2

Compañía Minera San Gerónimo. Av. Talca 101, Barrio Industrial Alto Peñuelas, Coquimbo, Chile

Abstract

This study analyses reproductive aspects of the fish Isacia conceptionis based on 280 females collected at La Herradura Bay, northern Chile, between April 1995 and March 1996, using histological analysis of the ovaries, measurement of gonadosomatic and gonadic indices and the batch fecundity. Five maturity stages for the ovary were described. Mature females were partial spawner because of simultaneous presence of oocytes at different maturity stages. The high frequency of mature females and high gonadosomatic and gonadic indices observed during austral winter and summer suggest  two spawning  seasons. The estimated  batch  fecundity   (F)  for total length (LT)  was F = 0.0003LT3.9701 and for total weight  (PT)  was F = 0.2255PT1.1539

Key words

Reproduction, ovary, histology, partial spawner

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