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The Effect of Variable Incubation Temperatures on Hatchability and Survival of Goldlined Seabream, Rhabdosargus sarba (Forsskål,1775) Larvae

The effect of varying holding temperature on hatching success, occurrence of deformities and mortality rates were investigated for goldlined seabream eggs. Wild broodstock (600 g) were stocked at a 2:1 male-female ratio in a 2 m fiberglass tank supplied with filtered seawater (37 g L salinity, temp. range 24±0.5 C [day] and 22±1 C [night], DO2 in excess of 5.0mg L). Females were injected with 200 IU kg HCG between 08.00 and 10.00 h and returned to tanks to spawn following which eggs were collected by hand using a 100μm net. Fertilized eggs at the gastrulation stage (120 L) were randomly placed into one of 12 experimental 6 L aerated (DO2 5 mg L) plastic containers with water temperatures maintained at 24±0.5 C (ambient), 26±0.5 C, 28± 0.5 C and 30±0.5 C using thermostats. Each treatment was undertaken in triplicate using a 12:12 photophase:scotophase photoperiod. No differences were recorded between eggs reared at 24 and 26 C with respect to viability, deformity, mortality or unhatched egg rates. Increasing temperature reduced the number of viable eggs with those at 30 C returning poorest performance (P < 0.05). Mortality levels were lowest for eggs incubated at 24 and 26 C. The greatest level of deformities recorded was that for eggs reared at 28 C. Keywords—Goldlined seabream, Oman, R. sarba, deformities.