SEXUAL DEVELOPMENT OF THE TROPICAL SHORT-FINNED EEL Anguilla bicolor bicolor OF THE SEGARA ANAKAN WATERS, CENTRAL JAVA, INDONESIA
Abstract: A total of 289
specimens of tropical short-fi nned ell (Anguilla bicolor bicolor) was collected
from Segara Anakan in May, September, October and November 2004. Basic
biological information including body weight (BW) and total length (TL), gonad
morphology, gonad somatic index (GSI) and eye index (EI) among collecting
specimens were examined in order to understand their sexual development. It was
found that Anguilla bicolor bicolor from Segara Anakan were greatly varied in
body weight (10-900 g) and total length (19-78 cm), suggested their occurred in
different like stages (young to adult ell). Based on gonad morphology it was
found that sexual development of the species could be separated into four
groups namely: female (17.6%), male (48.1%), intersex (32.2%) and developed
(2.1%). GSI were 0-3 in female, 1-9 in male, 0-4 in intersex and 2-7 in
undeveloped. EI were 3-10 in female, 1-7 in male, 2-8 in intersex and 1-4 in
undeveloped. Positive relationship was found between EI and BW and TL of the
species in each sexual development, but no correlation between GSI and BW and
TL, except for female. Different from temperate eels that bigger in GSI and EI,
suggested earlier sexual maturation in the tropical in the temperate.
Author: Hagi Y. Sugeha, Irwan
Jatmiko, Sahri Muhammad
Journal Code: jpperikanangg090003
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