A preliminary investigation of sex change in Pseudotropheus lombardoi (Pisces: Cichlidae)

摘要: Peters (1975) suggested the possibility of adult sex change in certain cichlids Lake Malawi. When adultPseudotropheus lombardoi male coloration were found mouthbrooding eggs under natural conditions Malawi, one possible explanations for this female-type behaviour was that had occurred, but with retention coloration. Behavioural investigations based on current models social systems sex-changing species conducted an attempt to substantiate hypothesis. These observations supplemented by histological examination gonads individuals both sexes. A pronounced advantage mating success dominant males over non-dominant noted. Similarly, large females a greater reproductive than smaller females. Thus, occurred inP. following ‘size model’ (Warner 1975) investigated. However, studies did not provide conclusive evidence change; only undeveloped oocytes testes all examined. It is postulated maleP. pass through intersexual juvenile period. Later, testicular elements dominate within gonad still containing immature oocyte tissues. further femaleP. are dimorphic, some having and others female