SOMATIC ENERGY CONTENT AND HISTOLOGICAL ANALYSIS OF THE GONADS IN ANTARCTIC FISH FROM THE SCOTIA ARC

F. A. VANELLA; J. CALVO; E. R. MORRICONI; D. R. AURELIANO

SCIENTIA MARINA

Institut de Ciéncies del Mar

Lugar: Barcelona; Año: 2005 vol. 69 p. 1 - 12

0214-8358

  Histological characteristics of the gonads and the energy contents of axial muscle, liver and gonads of Antarctic notothenioid fish collected during the LAMPOS (Latin American Polarstern Survey) survey in April 2002 were analysed. Ovaries and testes were staged following histological maturity criteria. Oocyte frequency diameters were established and fecundity values were estimated. The energetic values (kJ/g) of different organs were determined using a microcalorimetric bomb. Ovaries of Chaenocephalus aceratus showed a generalized atretic process. Gonadal histology of Champsocephalus gunnari, Pseudochaenichthys georgianus and Chionodracus rastrospinosus suggests that their spawnings take place in autumn. Gobionotothen gibberifrons and Lepidonotothen larseni females were in process of maturation, with the ovaries of the former containing yolked and atretic oocytes together. Ovaries of Lepidonotothen kempi showed old postovulatory follicles, which provided an evidence of previous spawning. Gonads from both sexes of Dissostichus eleginoides were immature. Absolute and relative fecundity were lower in Channichthyidae than in the Nototheniidae. The energy content of the different analyzed organs were: liver > gonads > axial muscle. The highest value of energy density (kJ/g wet body mass) was found in Dissostichus eleginoides.