Effect of Temperature and Zinc (Zn) Temporal Variation in Water on Size Distribution of River Catfish (Mystus sp.) at Blanakan River, West Java

River catfish (Mystus sp.) is a species commonly found in the Blanakan river. The community also consumes this species lived around Blanakan. This study aimed to investigate the effect of temporal variation of temperature and metal Zn on the Mystus sp. size distribution. The fish samples and water were collected from the river in the early and end of June to represent temporal variation. Simultaneously, the water temperatures were also recorded. The fish samples' length and weight were measured. The AAS (Atomic Absorption Spectroscopy) was used to analyze Zn in water samples. The results showed that there was a temperature decrease from 32.9 0C to 30.8 0C. The Zn was also decreased from 1.12 mg/l to 0.14 mg/l. The length of Mystus sp. was increased from 13.27 cm to 14.00 cm. In contrast, the weight was reduced from 36.29 g to 32.88 g. To conclude, the temperature and Zn temporal variation affected the increasing length and reducing weight.