Effects of Frequency of Egg and Fry Removal on Spawning by Tilapia nilotica in Hapas

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Abstract
Tilapia nilotica were spawned in small-mesh net enclosures called hapas. During a 5-week period, eggs and fry were removed from mouth-brooding females at examination intervals of 2, 4, 7, or 10 d. A decrease in time between examination intervals increased the total number of spawns collected (P < 0.05), but more spawns were obtained per examination for the 7- and 10-d intervals (P < 0.05). For artificial incubation of eggs, the 7-d interval was considered optimal.