Coastal Aquaculture and Mariculture (2+1)

Unit 5 - Finfish culture systems

5.3.1. Source of seed

• Fry are generally produced in hatcheries.
• The fish can be matured in sea cages and bred through environmental manipulation of hormonal injections.
• Wild ripe spawners can also be collected and stripped followed by dry method of fertilization.
• Eggs hatch in 12-15 hours at a temperature of 29-31^oC. They are hatched in seawater of salinity 30 ppt.
• Larvae start feeding from the 2nd day onwards when they are fed marine rotifer Brachionus plicatilis.
• From day 8 post hatch they are fed with Artemia nauplii or cladocerans.
• 25-30 days post hatch they are fed with ground trash fish meat/sub-adult and adult Artemia.
• Grading is essential to prevent cannibalism starting from 2nd weed post hatch.