THE EFFECT OF HORMONE (17α-METHYLTESTOSTERONE, 17β-ESTRADIOL) USAGE ON DEVELOPMENT, SEX INVERSION AND PIGMENTATION OF ELECTRIC YELLOW CICHLID (Labidochromis caeruleus FRYER, 1956)

Abstract

This research was designed in order to examinate the effects of 17α-methyltestosterone and 17β-estradiol hormone use on the development, growth performance, survival, sex ratio and coloration of the electric yellow cichlid (Labidochromis caeruleus Fryer, 1956). Seven different groups were designed in the study. While no hormones were added to the control diet, 6 different rates of hormones were added to the other groups. Cichlid mean weight was determined as 0.64±0.01 g, were stored such that three replications for each group. The fish were fed with the feeds for a period of 2 months. At the end of this research, the highest weight gain was determined in the 20 mg kg -1 17α-MT group (0.39±0.17 g). When the sex change rates were evaluated, it was determined that the feminization rates in the 17β-ES hormone group were 80.00%, 82.22% and 86.67%, respectively, and all fishes in the 17α-MT hormone group were 100% male. When the results of the physical color analysis were evaluated, it was determined that the best coloration was obtained in the 17α-MT groups. At the end of the study, the 17α-MT hormone was determined to have a better effect than 17β-ES hormone on the growth, feed conversation rate, sex change and pigmentation of electric yellow cichlid (Labidochromis caeruleus Fryer, 1956).

Effects of synthetic androgen (17α-methyltestosterone) and estrogen (17β-estradiol) on growth and skin coloration in emperor red cichlid, Aulonocara nyassae (Actinopterygii: Cichliformes: Cichlidae)

“…Fish groups fed 17α-MT hormone had a better growth rate. These results are in agreement with the studies on Labidochromis caeruleus (see Karsli et al 2018), Oreo-chromis andersonii (see As et al 2012), O. niloticus (see Greisy and Gamal 2012;Ajiboye et al 2015), and Trichogaster lalius (see Biswas et al 2014). However, other studies reported that the hormone treatment negatively affected growth and development in a dose-dependent manner in zebra cichlids (George and Pandian 1996), Betta splendens (see Kirankumar and Pandian 2002), and O. niloticus (see Sreenivasa and Prabhadevi 2018).…”

“…Similarly, it has been reported that the 17α-MT hormone increased pigmentation which has a positive impact on coloration in B. splendens and Xiphophorus hellerii (see Jessy and Warghese 1987). When the physical color analysis results of the Karsli et al (2018) study on electric yellow cichlid were evaluated, it was determined that the best coloration was obtained in 17α-MT groups, similar to this study. In contrast to these studies, it was reported that 17α-MT supplementation for 28 days did not affect coloration in Xiphophorus hellerii (see Koshio et al 1993;Yanong et al 2006).…”

Use of purslane (Portulacasp.) extract as a potential feed additive on growth parameter and skin pigmentation for blue streak hap,Labidochromis caeruleus(Fryer, 1956)

“…Significant difference in survival was found between groups, T9 and T6, compared to other experimental groups (T3 and T0; p < .05). In studies conducted with cichlid fish, weight gain, survival rates varied between 53.3% and 100% (Karslı et al, 2018; Yeşilayer et al, 2020; Yılmaz & Ergün, 2011). Purslane supplemented groups had highest relative survival rate, whereas the control fish group was with the lowest relative survival.…”

“…In ornamental fish farming, growth, reproduction and coloration of fish are primarily dependent upon adequate supply of feed ingredients and additives. For this reason, studies on aquarium fish diets have been focused on using natural ingredients (Yeşilayer, Aral, et al, 2011) and additives (Karsli et al, 2016, 2018; Yeşilayer et al, 2020; Yiğit et al,2019) to achieve better results for successful aquaculture practices considering reproduction and coloration parameters, survival rate and disease resistance. Colour is one of the major factors which determine the price of the ornamental fish in the world market.…”

“…Electric yellow cichlid belongs to Cichlidae family under Perciformes order. Males are larger with brighter colors than the females (Karsli et al, 2018). In the present study, the effects of dietary purslane extract on the growth and coloration of the blue streak hap, L .…”