Gajenje karaša (Carassius carassius) u ribnjacima

Uzgoj juvenilnih jedinki karaša (C. carassius) analiziran je u pet ribnjačkih objekata veličine 100 m2. Karaš je gajen u monokulturi u dva, dok je sa linjakom gajen u bikulturi u tri ribnjačka jezera. Stopa preživljavanja karaša u monokulturi iznosila je 21.15±6.86 %, a u bikulturi 47.07±16.86%. Kod linjaka je zabeležena veca stopa preživljavanja (69.33±16.76) i brži rast u odnosu na karaša. Iako je prema dobijenim rezultatima teško proceniti razlike između uzgoja u monokulturi i bikulturi, može se zaključiti da linjak nije značajan kompetitor karašu

Plasma levels of cortisol and glucose in response to capture and tank transference in Rhamdia quelen (Quoy & Gaimard), a South American catfish

Males and females of Rhamdia quelen (Quoy & Gaimard) were subjected to capture and tank transference in order to evaluate the stress response. This process provoked a characteristic stress response in both sexes, with cortisol values reaching a peak in one hour after stress. High levels of cortisol found in females were explained by the increase of energy demand and the mobilization in the vitellogenic phase. Several previous studies have shown that cortisol is strongly correlated to these periods in another catfish.32212112

Plasma steroid concentrations in relation to the reproductive cycle of cultured male Rhamdia quelen

The plasma concentrations of testosterone (T) of cultured jundia Rhamdia quelen increased progressively during spermatogenesis and reached a peak at the beginning of spermiation (e.g. fluidization of the sperm and production of milt). Plasma peaks of T occurred simultaneously to the highest production of T by the testis, however, both plasma concentrations an testis production of T decreased progressively during spermiation. Concentrations of 11-ketotestosterone(11-KT) peaked c. 1 month after the peak of T, concomitant with enhanced production of 11-KT by the testis. The concentrations of 11-KT during the first cycle were extremely high (>1 mug ml(-1)), but less during the second and third cycles, suggesting that this steroid is most important during the pubertal phase in male jundia. Plasma concentrations of both 17-hdroxy-4-pregene-3,20-dione (17-P) and 17,20beta-dihydroxy-4-pregen-3-one (17,20beta-P) Were significantly higher during spermiation than at an other times, and showed little variation. The pattern of steroid changes was cyclical and consistent with their proposed roles in male fish reproduction. (C) 2002 Published by Elsevier Science on behalf of The Fisheries Society of the British Isles.61375176

Steroid Profiles In Cultured Female Jundiá, The Siluridae Rhamdia Quelen (quoy And Gaimard, Pisces Teleostei), During The First Reproductive Cycle

The jundiá Rhamdia quelen (Quoy and Gaimard) is a teleost species from the Siluridae family and is an important species for aquaculture in temperate and subtropical climates. Gonad and blood tissue samples were taken from cultured jundiá females between 1998 and 1999. Plasma concentrations of 17β-estradiol (E 2), testosterone (T), 11-ketotestosterone (11-KT), 17-hydroxy-4-pregnene-3,20-dione (17-P), 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P), and 17,20β,21-trihydroxy-4-pregnen-3-one (20β-S) were measured by radioimmunoassay and potential correlations with the stage of oogenesis and sexual maturation examined. During the experimental period two spawning episodes were observed. Plasma concentrations of E 2 increased progressively during oocyte development, simultaneously with the appearance of yolk vesicles and increasing amounts of deposited yolk. In female jundiá, the T peak occurred in October and was coincident with the peak in gonadosomatic index. Two distinct peaks of progestogens were detected, corresponding to the two spawning episodes, suggesting that one or more of these steroids might act as the "maturational-inducing steroid" in jundiá. Unusually large amounts of 11-KT were also measured in the plasma of mature jundiá females. The identity of 11-KT was confirmed by thin-layer chromatography. Although the profiles of the other steroids are compatible with the roles proposed for the action of these hormones in other teleosts, the role of 11-KT, normally found only in males, is unknown. © 2001 Academic Press.1213325332Andrade, R.G.F., (1996) Histofisiologia das glândulas hipófise e interrenal. 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