INVESTIGADORES
COLAUTTI Dario Cesar
artículos
Título:
Seasonal changes in the somatic indices of the freshwater silverside, Odontesthes bonariensis (Teleostei, Antheriniformes) from a Neotropical shallow lake (Argentina)
Autor/es:
FREYRE, L; COLAUTTI D. C.; MAROÑAS M. E.; SENDRA E. D.; REMES LENICOV M
Revista:
BRAZILIAN JOURNAL OF BIOLOGY
Editorial:
Instituto internacional de ecologia
Referencias:
Lugar: Rio Grande do Sul; Año: 2009 vol. 69 p. 389 - 395
ISSN:
1519-6984
Resumen:
The study object was an Odontesthes bonariensis (Valenciennes, 1835) population of a characteristically shallow lake from the pampasic region. Over one year, zooplankton and fish samples were collected monthly. As a function of time and gender,several indices were investigated (relative weight, mesentery fat index, gonadosomatic index, hepatosomatic index and somatic index) and were related to zooplanktonic community dynamics, the main energy food source for this species. The results indicate that the seasonal information contained in the weight compartments is most important in mesentery fat, gonads and liver. The zooplankton availability modulates reserves (fat) behaviour and physiologic activity (liver), determining spawn intensity. Thus, in spring spawns, with higher zooplankton availability, mature individuals of the population, malesand females, transfer energy from the food to the gonads. In autumn spawns, they use the fat reserves for gonad ripening.