How do long-term effects of temperature influence sex ratio, somatic and gonadal development in juvenile sterlet (Acipenser ruthenusL.)-An additional climate change consequence?

Abstract

In this paper, the effects of temperature on the production performance values, as well as on sex differentiation and gonad development, of juvenile sterlet were investigated. For this purpose, fry were reared in the recirculating aquaculture system at three different temperatures (15, 20, and 25°C) in four replicate groups each for 140 days (10-150 dph). Fish were fed mainly with commercial diet. The growth rate in this period was significantly affected by temperature. The best performance values in terms of daily growth rate, thermal growth coefficient, and yield were registered at 20°C, indicating that this value to be near, or close to, the optimal for juvenile sterlet. Gonad samples were taken for histological analysis which revealed that the increased temperature did not cause significant differences in the sex ratio between treatments, but at 25°C resulted in significant deviation from the theoretically expected 1:1 gender ratio to favouring males. We have also found that increased temperature at 25°C accelerated germ cell development. These results indicate that rearing of sterlet juveniles at about 20°C temperature could be considered optimal both from aquaculture, as well as from species conservation viewpoints. K E Y W O R D SAcipenser ruthenus, sex ratio, somatic development, temperature

Early nutritional programming in sterlet sturgeon (Acipenser ruthenus) with dietary soybean meal: Assessment of growth performance, body composition, and expression of GH, IGF-I, and Ghrelin genes

“…These findings revel that various fish species response to feeding strategies in different ways. In phase 2, the water temperature was higher than the phase 1 and held at an average of 25.30 ± 0.34°C, which was optimal for sturgeon growth [ 51 ], which corresponded with the higher range of FER in this phase compared to those in phase 1. Kemski et al [ 49 ] also attributed the higher feed efficiency of yellow perch fed 70% SBM, while the water temperature was increased.…”

Effect of temperature on the growth, feeding performance, gonadal development, and nutritive compositions in the muscle of fry stream groupers, Acrossocheilus fasciatus

“…However, few reports on histological study of cultured A. fasciatus gonadal development are available. Minor temperature variations may produce considerable phenotypic changes in the gonads, hence, the effect of temperature on fish gonadal development is particularly obvious during its early life stages (Havasi et al, 2018).…”

Potassium diformate in the diet of sterlet sturgeon ( Acipenser ruthenus ): Zootechnical performance, humoral and skin mucosal immune responses, growth‐related gene expression and intestine morphology

“…The sterlet sturgeon, Acipenser ruthenus, is a relatively small species and widely spread in the Eurasia region. A. ruthenus is considered a commercial species in aquaculture industry due to its unique features such as high nutritional values (meat and caviar) for human consumption, use as an ornamental fish due to its suitable size and also play a key role in producing interspecific hybrids of sturgeon such as bester (Huso huso ♀ × A. ruthenus ♂; Havasi et al, 2018).…”