Growth and survival of silver pompano Trachinotus blochii (Lacepede, 1801) at different salinities in inland saline ground water

Abstract

Inland saline ground water (ISGW) has attracted great interest for commercial aquaculture of marine species in Haryana and Punjab. The silver pompano (Trachinotus blochii), a candidate for mariculture, was investigated for its potential to survive in inland saline water at ICAR-CIFE, Regional Centre, Rohtak, Haryana during 2015–16. The experimental set up comprised ISGW without potassium amendment, ISGW with potassium amendment and artificial sea water of 5 ppt, 10 ppt and 15 ppt salinity. In ISGW without potassium amendment, 100% mortality was observed at 12 h (5 ppt), 24 h (10 ppt) and 48 h (15 ppt). In the second experiment, three treatments (ISW5, ISW10 and ISW15) of ISGW with potassium amendment equivalent to sea water were prepared. A 100% survival was observed at all salinities in ISGW with potassium amendment, similar to the artificial seawater at the end of 90 days. Significantly higher weight gain, specific growth rate (SGR) and average daily growth (ADG) were observed at ISW10 and ISW15 than at ISW5. The plasma osmolality of silver pompano in ISW10 and ISW15 indicated that silver pompano regulates isosmotic condition to maintain the homeostasis of body. The present results indicate that silver pompano can be reared at 10 ppt to 15 ppt salinity with optimum growth and survival in potassium amended ISGW.

Potassium amendment of inland saline groundwater: Insights into the physiological responses of silver pompano Trachinotus blochii (Lacepede, 1801) at different salinities

“…Ionic regulation has strong relation with iso-osmotic point, wherein fish does not have to spend more energy to maintain homeostasis. Therefore, Pathak et al (2019) suggested that fish regulated osmotic balance at ISW10 and ISW15 as the iso-osmotic point of T. blochii was in between 10-15 ppt, which was reconfirmed in the present study with higher serum K + concentration at ISW10 and ISW15. Also, previous study reported higher uptake of potassium at near-isosmotic salinities in Argyrosomus japonicas reared in saline ground water supplemented with 100% K + of similar salinities (Partridge and Lymbery, 2008;2009).…”

“…Thus, in order to ascertain the feasibility of rearing T. blochii in ISW, a study was conducted to determine physiological responses. Growth performance of T. blochii juveniles in terms of mean final body weight, weight gain, specific growth rate and average daily growth was significantly higher at 10 and 15 ppt ISW compared to 5 ppt (Pathak et al, 2019).…”

“…Overall, this study confirms the suitability of T. blochii culture in K + amended inland saline water of 10-15 ppt based on the response of physiological attributes. Furthermore it is recommended that K + amendment of ISW10 would be more economical in terms of lower potassium amendment requirement than ISW15 without affecting growth (Pathak et al, 2019) and other physiological parameters, and therefore the culture of T. blochii could be undertaken in ISW10.…”

“…The ionic composition (Na + , Ca 2+ Mg 2+ and Na + /K + ratio) of inland saline water was found to be different at different salinities. However, potassium amendment at different salinities makes it suitable for rearing the fish (Pathak et al, 2019). Water quality parameters of rearing tanks (Do-6.5-7.5 ppm, Temperature-27-28.5 ○ C, pH-8-8.5, Alkalinity-170-250 ppm, Hardness-1300-3300 ppm, NO 2 -N and NH 3 -N below 0.002 and 0.02 ppm, respectively) were within the acceptable ranges for the culture of silver pompano (Hamed et al, 2016).…”

“…The silver Pompano Trachinotus blochii (Lacepede, 1801) due to its euryhaline nature has emerged as a prospective species for mariculture with high market demand (Gopakumar et al, 2011, Kalidas et al, 2012. The efficacy of ISW at 5, 10 and 15 ppt on T. blochii juveniles found 100% mortality in potassium deficient ISW, whereas growth and survival were substantially improved upon the K + amendment of ISW at different salinities (Pathak et al, 2019). Culture of fish in ISW at different salinities have several implications on the ionic regulation, Na + /K + ATPase activity, oxidative stress enzymes and proximate composition (Barman et al, 2005, Partridge and Lymbery, 2008, Jahan et al, 2017.…”