Prawn hatchery modifications and adaptions for temperate marine fish culture in northern NSW, Australia
Guy, JA, Cowden, KL 2015, 'Prawn hatchery modifications and adaptions for temperate marine fish culture in northern NSW, Australia', Aquacultural Engineering, vol. 67, pp. 14-23.
Marine fish culture is a new farming opportunity for NSW prawn farmers. To address current seed-stock supply issues two Palmers Island brackish-water prawn hatcheries (of Australian and Taiwanese design) were examined for conversion to mulloway (Argyrosomus japonicus) production. Both hatcheries were easily adapted with minimal cost and modification; the Australian design (1062 m2) was the simplest and cheapest to convert. The Taiwanese design (695 m2), required more work due to the permanent built-in nature of the concrete tanks, their rectangular shape and drainage. Fingerling output from the Australian hatchery was calculated at 630,000 × 40 mm (1 g) fingerlings or 150,000 larger 100 mm (12 g) fingerlings using a single annual hatchery run of 3 or 5 months, respectively, at a water temperature of 20–25 °C. The smaller Taiwanese hatchery had a theoretical maximum production of 320,000 × 40 mm (1 g) per batch or 50,000 × 100 mm (12 g); if pure oxygen was used in the nursery area this could be increased to 100,000 × 100 mm. Both hatcheries could operate with 3 to 4 staff and use of these facilities, in conjunction with staff training, would resolve the current poor availability and high cost of juveniles for grow-out.