The relationship between dominance and spawning inHerotilapia multispinosa (Pisces: Cichlidae)

The outcomes of fights between all possible pairs of same-sexed individuals were used to infer the within-sex dominance rank of six male and six femaleHerotilapia multispinosa. The resulting dominance hierarchies were compared with the order in which all 12 fish spawned when placed together in a large aquarium. Two replications of dominance rank assessment and spawning order were carried out. The spawning order of females was highly correlated with their dominance rank in both replications. Males spawned in a similar order in both replications but did not form a stable dominance hierarchy as inferred from the outcomes of fights. It is suggested that this finding may be due to the importance of site attachment in the agonistic behavior of maleH. multispinosa.