REPRODUCTIVE BIOLOGY OF MARBLED SWAMP EEL, Synbranchus marmoratus BLOCH, 1975 IN GARGALHEIRAS RESERVOIR, RIO GRANDE DO NORTE, BRAZIL

• Autor(a) principal: Barros, Nirlei Hirachy Costa
• Data de Publicação: 2013
• Outros Autores: Nascimento, Wallace Silva, Araújo, Andréa Soares, Souza, Arrilton Araujo, Chellappa, Sathyabama
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Biota Amazônia
• Texto Completo: https://periodicos.unifap.br/index.php/biota/article/view/607

The Reproductive biology of the hermaphrodite fish the marbled swamp eel, Synbranchus marmoratus (Bloch, 1795) (Osteichthyes: Synbranchidae) was investigated in the Marechal Dutra reservoir, Acari, Rio Grande do Norte, using samples captured monthly during the period of July 2010 to July 2011. The captured fish specimens were numbered, weighed, measured, dissected and their gonads was removed, weighed and identified as to sex and developmental stages of gonads. The length-weight relationship was determined for grouped sex. The gonadosomatic index (GSI) and condition factor (K) were calculated. The developmental stages of the gonads were investigated using macroscopic techniques. The macroscopic characteristics of gonadal development showed four different sexual types in the sampled population: primary males, females, transitional individuals and secondary males. Females were more frequent during the entire study period. This species showed a negative allometric growth with a higher increase in length than weight. The condition factor showed its lowest value in August and showed two peak values in December 2010 and in January 2011. The GSI indicated a reproductive period from July to august 2010 and was negatively correlated with the condition factor. S. marmoratus presents a seasonal reproductive strategy which optimizes its reproductive success under the semiarid climatic conditions.Keywords: Synbranchus marmoratus; gonadosomatic index; condition factor; gonadal aspects; semiarid reservoir.