Determination of ideal stocking density for cage culture of monosex Nile tilapia (Oreochromis niloticus) in India

Abstract

Stocking density is considered one of the important factors affecting fish growth. But, information related to impact of stocking density on growth performance of androgen-treated monosex tilapia population during cage culture under the ecological conditions of Gangetic plains in West Bengal, India is limited. The aim of our study was to compare the growth potential of control and hormonetreated, sex reversed tilapia at various stocking densities and to determine an ideal stocking density for cage culture of monosex fish. Control and hormone treated fish were stocked separately in mesh cages at different stocking densities (1, 5, 10, 15, 25, 50, 75 and 100 fry / m 3 ) and it was found that the highest growth was observed for the 50 fish / m 3 groups for both the control and hormone treated categories. More over, the monosex androgen treated population showed much higher growth potential for all the density groups compared to the corresponding mixedsex population. Thus, cage culture of hormone treated monosex tilapia at a density of 50 fish / m 3 can be considered ideal for augmented production of the fish under Indian context.

Multiresidue antimicrobial determination in Nile tilapia (Oreochromis Niloticus) cage farming by liquid chromatography tandem mass spectrometry

“…Nile tilapia cage farming in Brazil is characterized by high stocking densities (80 to 120 kg m −3 ), with mortality rates ranging from 10 to 20% (Ayroza et al, 2014;Sabbag et al, 2007) whereas in other countries, densities range from 2 to 50 kg m −3 (Chakraborty et al, 2010;Gibtan et al, 2008;Ouattara et al, 2003;Watanabe et al, 1992;Yi et al, 1996). These conditions, processes of grading, capturing and transporting fish, poor water quality and all stressful factors increase the risks of disease outbreaks (Conte, 2004) and become the system increasingly dependent on chemical inputs, especially antimicrobials (Garcia et al, 2013).…”

Growth and stress of dourado cultivated in cages at different stocking densities

“…In this intensive system of cultivation, high densities are essential to increase productivity (Barcellos et al, 2004;Demétrio et al, 2012). Studies indicate that there is an inverse relationship between density and growth of fish when stocked at a very high density, and that maximum growth is generally obtained at an intermediate stocking density that also provides a reasonable survival percentage (Chakraborty et al, 2010). The ideal density is one that does not cause substantial reduction in growth rates or in environmental quality (Van de Nieuwegiessen et al, 2008).…”

Effect of stocking density on growth, maturity, fecundity, reproductive behaviour and fry production in the mouth brooding cichlid Oreochromis mossambicus (Peters)

“…Optimum utilization of space for maximum production in intensive fish culture practices is known to improve the profitability of fish farm (Chakraborthy et al, 2010). In this study, though the survival rate was observed to be density dependent, it was generally remained high.…”

“…This observation on growth is in agreement with earlier observation on O. mossambicus (Al-Jerian, 1998). Reduction in growth with increase in population density has also been reported for O. niloticus and hybrids of O. niloticus × O. aureus by several authors (Liu and Chang, 1992;AlHerbi and Siddiqui, 2000;Yousif, 2002;Oumah et al, 2010;Chakraborthy et al, 2010). However, Osopheros et al (2007) have recorded insignificant differences between daily weight gain and stocking density and between specific growth rate and stocking density in O. niloticus.…”

“…Reproductive potential of Tilapia has been reported to be influenced by temperature (Hyder, 1970), salinity (Chervinsky, 1982), food (Miranova, 1977) and dietary protein level (De Silva and Radampola, 1990;Gunasekara et al, 1995). Similarly, the effect of stocking density on growth, sex ratio, fecundity and fry production in Nile tilapia, O. niloticus has been studied from time to time (Ridha and Cruz, 1998;Al-Herbi and Siddiqui, 2000;Yousif, 2002;Osofero et al, 2007;Khalfalla et al, 2008;Offem et al, 2009;Onumah et al, 2010;Chakraborthy et al, 2010). As compared to this, in O. mossambicus hitherto, the effect of stocking density on growth alone has been reported (Al-Jerian, 1998).…”