Welfare of scaleless fish, Sagor catfish (Hexanematichthyssagor) juveniles under different carbon dioxide concentrations

Increased acidification has shown to bring negative impacts on marine fish. Currently, fish with scales have been extensively investigated, whereas a few systematic studies have been carried out for investigating impacts of acidified environment towards the growth of scaleless fish. Thus, this research aimed to evaluate carbon dioxide, CO2‐induced acidification impacts towards the welfare (growth with health) of the commercially aquaculture scaleless fish, Sagor catfish (Hexanematichthys sagor) for 20 weeks. Fish specimens were exposed to control pCO2 (400 µatm), mild pCO2 (550 µatm) and high pCO2 (900 µatm). Growth were measured by feed conversion ratio (FCR) plus specific growth rate (SGR). The outcomes indicated that the significantly lowest SGR was flaunted in high pCO2 group supported with the significantly highest FCR indicating poor growth. Health parameters significantly showed the highest value of red blood cell, haematocrit, haemoglobin, white blood cell, thrombocyte, mean corpuscular volume and haemoglobin in control group while urea, cholesterol, aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, lactate dehydrogenase, serum cortisol plus glucose were significantly the lowest in control pCO2 with regard to mild and high pCO2 group. These findings can serve as important baseline data in formulating managements regarding the specific effects of acidification on scaleless fish.

Noor N. M., De M., Cob Z. C. & Das S. K., in press. Welfare of scaleless fish, Sagor catfish (Hexanematichthyssagor) juveniles under different carbon dioxide concentrations. Aquaculture ResearchArticle (subscription required).

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