in this study, the effect of short-terms starvation (0, 2, 4 and 8 days) on plasma cortisol, glucose, triglyceride and cholesterol levels and also hepatosomatic index in siberian sturgeon, acipenser baerii, was investigated. after acclimation to experimental conditions for 10 days using formulated diet, 180 juvenile siberian sturgeons (mean weight ? s.e.=19.3?0.4, n=15) were randomly distribute...

Morphometric of examination gonads Liza carinata were performed for one year (October 1995 – September 1996) to study the maturation development. Monthly variation in gonado somatic index (GSI) noticed, that started with low values during October and November. Significant increase was recorded period December - April peak February (3.59 males & 9.33 females) followed by a significant declin...

Sex ratio, size at maturity, maturity stages, fecundity and egg diameter of Oreochromis niloticus from Coatetelco Lake, Morelos State, Mexico, were studied from January to December 1993. Sex ratio (male:female) was approximately 1:1.02. Length at maturity was 117 mm (males) and 120 mm (females). The fecundity ranged between 104 and 709 eggs, with egg diameter from 1,000 to 3,000 microns. The go...

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...