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Temperature Impact Hatching in Cobia

Effect of seawater temperature on incubation period and hatching efficiency (%) in the sand lobster Thenus unimaculatus

The commercially important fish, cobia was bred and the hatching of eggs in different seawater temperatures was observed in hatchery. Hatching duration was lowest (9.1 hr) at 34oC, in the hatchery, but the hatching success was very low at higher temperatures.At higher temperatures (32 and 33oC), 25 to 50% of the developing larvae were deformed in the tail region.At 34oC, the eggs either did not hatch, or those hatched out, were deformed.

Successful spawning of commercially important finfish, the cobia Rachycentron canadum was obtained at a temperature range of 27.5oC (March) to 30.6oC (July) and those of pompano Trachinotus blochii at a temperature range of 26.5oC (November) to 29.0oC (July) in sea cages off Mandapam.

 

 

 

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