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Optimization of weaning strategy in the climbing perch (Anabas testudineus, Bloch 1792) larvae on growth, survival, digestive, metabolic and stress responses

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Abstract

A 30-day experiment was carried out to know responses of different weaning approaches to the growth and survival of Anabas testudineus larvae. A total of 10800 larvae (Avg. weight 0.016 ± 0.03 mg; 3DPH) were randomly distributed in nine treatments (triplicates), including two controls. The strategies are as follows: C1 (Control I): feeding with live food (LF) for 30 days and C2 (Control II): feeding with microparticulate diet (MPD) for 30 days; T1: LF for 5 days and MPD for next 25 days; T2: LF for 10 days and MPD for next 20 days; T3: LF for 15 days and MPD for next 15 day; T4: LF for 20 days and MPD for next 10 days; T5: LF for 25 days and MPD for next 5 days; T6: LF for 5 days, then 25% LF replacement by MPD for next 5 days, 50% LF replacement by MPD for next 5 days, 75% LF replacement by MPD for next 5 days, and 100% LF replacement by MPD for last 10 days; and T7: LF for 10 days, then 25% LF replacement by MPD for next 5 days, 50% LF replacement by MPD for next 5 days, 75% LF replacement by MPD for next 5 days, and 100% LF replacement by MPD for last 5 days. Significantly (p < 0.05) higher WG and SGR were recorded in T2 (213.17 ± 0.32, 23.98 ± 0.02) followed by T6, whereas the lowest was found in C2. Significantly higher (p < 0.05) percentage survival was manifested in the T7 (31.83 ± 0.22), followed by T2 (24.75 ± 0.13), and the lowest survival was observed in the C2. The digestive enzyme activities were found to be non-significant (p > 0.05) between different treatment groups. The alanine aminotransferase (ALT), aspartate aminotransferase (AST), lactate dehydrogenase (LDH), and malate dehydrogenase (MDH) were reported to be significantly higher (p < 0.05) in C2 (68.52 ± 0.08, 19.55 ± 0.10, 21.79 ± 0.04, and 0.044 ± 0.01) followed by T1; however, their reduced level was observed in C1. The activity of superoxide dismutase (SOD), catalase (CAT), glucose, and cortisol levels was observed significantly (p < 0.05) higher in C2 and lower in C1 and T2. As per the finding, it can be recommended that the appropriate weaning time for A. testudineus larvae is from 13 DPH onwards, in which larvae can be fed an initial ten days LF afterward MPD and the best weaning strategy can be adopted as in the T7 group for higher survival percentage.

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Acknowledgements

All authors are thankful to the Vice-Chancellor, ICAR- Central Institute of Fisheries Education, Mumbai, for supplying the required infrastructure to carry out the present research. The first author duly acknowledges ICAR-CIFE for the fellowship during the research period.

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Contributions

Patekar Prakash: Data curation, Investigation, Software, Writing -original draft. Sikendra Kumar: Conceptualization, Supervision, Writing—review & editing. Parimal Sardar: Supervision, Writing – review and editing. Sukham Munilkumar: Practical supervision, Writing – review and editing. Sujata Sahoo: Chemical analysis, Data curation. M. Satheesh: Writing – review & editing, Formal analysis. Halpati Reena: Editing, Formal analysis. Vijayakumar Mannur: Formal analysis, Software implementation. Anusha Patel: Data curation and editing of the manuscript.

Corresponding author

Correspondence to Sikendra Kumar.

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This study was carried out in accordance with the recommendations made by the Committee for the Purpose of Control and Supervision of Experiments on Animals (CPCSEA) of government of India. These recommendations ensure the welfare and maintenance of fish used in laboratory studies for biomedical research and product testing.

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I, Dr. Sikendra Kumar, give my consent for information about a research paper to be published in Fish Physiology and Biochemistry journal.

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The authors affirm that they have no known financial or interpersonal conflicts that would have seemed to have an impact on the research presented in this study.

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Prakash , P., Kumar, S., Sardar, P. et al. Optimization of weaning strategy in the climbing perch (Anabas testudineus, Bloch 1792) larvae on growth, survival, digestive, metabolic and stress responses. Fish Physiol Biochem 49, 1151–1169 (2023). https://doi.org/10.1007/s10695-023-01248-8

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