REPRODUCTIVE CHARACTERISTICS OF INDONESIA MAHSEER (Tor tambroides, Bleeker, 1854), IN TWO DIFFERENT RIVERS IN WESTERN SUMATERA
Abstract: The reproductive
characteristics of mahseer, Tor. tambroides, were studied in Manna River and
Batang Tarusan River, which are located on each side of Western Sumatera River.
The reproductive period of T. tambroides is largely consistent with that
described for the species in other areas, however monthly variations in the
extent and timing of peak spawning are recorded. The analysis of the sex ratio
indicates an increase in the percentage of females with size, more marked in
largest sizes. Seasonal patterns in the occurrences of spawning showed that the
spawning season in Manna River lasted was similar with that in Batang Tarusan
River, although a second prominent increase of GSI was observed in April and
September in Manna River, meanwhile the GSI of Batang Tarusan River fish were
below 2 without an apparent variation. L50s of Manna River and Batang Tarusan
River mahseer were estimated as 24.5 cm and 20.66 cm, respectively, indicating
a high variability in size at first maturity of the mahseer population. Our
study provides some important information on the reproductive biology of T.
tambroides that will be helpful in similar studies and contributed to fisheries
management of this species.
Keywords: Mahseer;
reproductive characteristics; manna river; Batang Tarusan River
Author: Arif Wibowo, Siswanta
Kaban
Journal Code: jpperikanangg140023
