Nursery rearing of marine finfishes - different culture system approach

Megarajan, Sekhar and Xavier, Biji and Shiva, Ponnaganti and Rao, Damodara P (2024) Nursery rearing of marine finfishes - different culture system approach. In: Manual on Advances in Marine Finfish Farming Practices. CMFRI Training Manual Series No.37/2024 . ICAR- Central Marine Fisheries Research Institute, Visakhapatnam, pp. 10-22.

Text CMFRI Training Manual Series No. 37_2024_Biji Xavier.pdf Download (3MB)

Abstract

Coastal marine aquaculture is one of the emerging areas for marine food fish production and is mainly performed in the seaand in coastal ponds. Mariculture and coastal aquaculture collectively produced 30.8 million tonnes (USD 106.5 billion) of aquatic animals in 2018, and they are mainly from marine cages, coastal cages and coastal earthen ponds. Increasing marine food fish production through innovative and intensive culture methods has increased demand for marine finfish seeds either from wild collection or hatchery based production. In this context, nursery raring plays an important role in supplying sufficient numbers of fingerlings at ready-to-stockable size in grow–outculture for better survival and faster growth. Larval rearing ends after the larvae achieve the full metamorphosis, and the metamorphosed early fry harvested from larval tanks is often not strong enough for direct stocking in grow-out farms. Thus, nursery rearing of fish larvaeis important for the production of the grow-out culture of stockablesize fish. It is evidenced that healthy seeds are key for a healthy grow-out culture with better economic returns. Thus, maintaining healthy and disease-free stock is of prime importance for achieving better production in the grow-out system. So, the nursery-rearing concept gives a better opportunity to maintain large numbers of fish fingerlings in small areas, which facilitates for effective management. Nursery rearing practices are majorly classified into two major categories; indoor and outdoor systems; where indoor-based culture is performed either by flow-through or recirculation based concept in FRP (Fibre Reinforced Plastic) /concrete/collapsible tanks. Outdoor-based system is performed either running or moving waters in hapa erected or installed in earthen ponds, coastal cages and marine cages. All these culture systems have their own merits and demerits concerning management and advocating these systems are based on the size of stocking and method of grow-out systems will be implemented for the species.

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