Reproduction of Oreochromis aureus
Document source: http://www.fishbase.se/Reproduction/FishReproSummary.php?ID=1387&GenusName=Oreochromis&SpeciesName=aureus&fc=349&StockCode=1423
 
Main Ref. Trewavas, E., 1983
Mode dioecism
Fertilization external
Mating type polygyny
Spawning frequency one clear seasonal peak per year
Spawning aggregation Ref.  
Batch spawner Yes.   Ref.  
Reproductive guild bearers
external brooders
Parental Care maternal
Description of life cycle and mating behavior Nesting usually in shallow water weedy areas (Ref. 96). Males establish territory and dig a spawning pit (Ref. 2, 6465, 54601), using mouth and fins (Ref. 2), up to 60cm deep and 4-6m in diameter; a number of territories can often be found clustered together (Ref. 52307). Territories are defended by means of agressive behaviour (Ref. 6465), including lateral display, lateral biting and mouth-to-mouth combat (Ref. 2). Reproduction is stimulated by long photoperiods and inhibited by short daylengths (Ref. 54365). Reproduction requires a minimum temperature of about 20°C (Ref. 2). Males visit schools of females and attempt to attract a female spawning partner (Ref. 2, 52307). Courting behaviour in the nest consists of lateral display by both sexes with nipping and tail-flapping (Ref. 2). Eggs are deposited in single clutches, from several dozen to 100 eggs (Ref. 52307), and are taken into the females mouth as soon as they are fertilized (Ref. 2, 6465, 52307), with a peak spawning frequency around the 9-11th hour of light (Ref. 31140, 54365). One female may hold up to 2000 eggs in her mouth (Ref. 2). The female swims away to deeper water with the brood after spawning is complete (Ref. 2, 52307), while the male renews spawning activities with another female. Hatching occurs about 3 days after oviposition (Ref. 2). Incubation time varies with temperature, 13-14 days at 25-27°C (Ref. 2, 52307) or 8-10 days at 29°C (Ref. 144), and juveniles leave the mother's mouth when they are about 1.1cm in length (Ref. 54601). The young school near parent's head for a few days, reentering the mouth at any sign of danger or at a gesture of the female; parent-offspring relationship ceases after 5 days (Ref. 2).
Search for more references on reproduction Scirus
(e.g. 9948)
( e.g. cephalopods )
Entered by Binohlan, Crispina B. on 01.24.91
Modified by Luna, Susan M. on 06.07.16
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