Abstract
This research aimed to know the length-weight relationship, condition factor, and otolith shape of marble goby (Oxyeleotris marmorata Blkr.) at Sermo Reservoir Yogyakarta. In total 211 samples (95 males and 116 females) were collected using gillnet and folded trap (bubu). Each sample was observed for sex determination, and then measured its total length, body weight, and otoliths diameter. The data were analyzed to determine the length and weight distribution, length-weight relationship, condition factor, and length-otolith diameter relationship. The result showed that the total length of the male was ranged 12.0-38.2 cm and female was ranged 12.2-44.5 cm. The weight of the male was ranged 21.0-704.8 g and female was ranged 21.1-1593.7 g. Both male and female have positive allometric growth with the equation W=0.0056L3.2894 for male and W=0.0051L3.311 for female. Condition factor was ranged 0.787-1.313 for male and 0.800-1.379 for female, and the majority of fish has a good condition (Kn ≥0.95 more than 50%). The shape of otolith edge was sinuate surrounded with regular wave-like curves, the diameter was increased in line with increasing of total body length by an equation of Y=0.2335+0.0248X (r=0.938).
Highlights
Sermo Reservoir, the first artificial lake in Yogyakarta, has several important roles such as agriculture water supply, sources of clean water and fisheries
Male and female marble goby in Rawa Jombor has a maximum length of 34.3 cm and 42.7 cm, respectively [9]
The relative condition factor of marble goby in Sermo Reservoir was lower than those found in Rawa Jombor, Klaten, ranged at 0.273-2.256 for male and at 0.128-1.765 for female [9]
Summary
Sermo Reservoir, the first artificial lake in Yogyakarta, has several important roles such as agriculture water supply, sources of clean water and fisheries. Marble goby catch in Sermo Reservoir was still below other species, such as tilapia or red devil. Marble goby is a carnivore at the top of pyramid fewer number compare to other organisms at lower trophic levels [3]. Tilapia was dominant fish species, comprised of more than 50 % of fish catches in Sermo Reservoir [4], but shifted over by red devil (Amphilophus labiatus) which was fast growth and become dominant species, it has low economic value. As the red devil population is expected to be increasing annually, it was necessary to control their population
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