Growth Pattern, Sex Ratio and Distribution of Humpback Fish (Hemisilurus heterorhynchus, Bleeker 1854) in the Flooded River Basin, Kampar Kiri, Riau Province

Abstract

Flood plain river is one of the characteristics of Riau Province. The difference between H. heterorhynchus fish and other species is its distinctive mouth and bent body. H. heterorhynchus is a fish with high economic value. These fish are often overfished, which can lead to a decline in the fish population in the future. Therefore, this research was carried out to be able to see the growth pattern, sex ratio and distribution of fish so that it can become the basis for information, cultivation and preservation of H. heterorhynchus. The number caught was 78 (56.67%) male fish and 36 (43.33%) female fish. The total body length of male fish is 19-41 and female fish is 19-50 cm, the total body weight of male fish is 40-310 g and female fish is 40-600 g. The allometric growth pattern of male and female fish was negative, with b values ​​of 2.8 (males) and 2.2 (females). Correlation analysis of H. heterorhynchus fish are r= 0.98 (male) and r=0.877 (female). The sex ratio of male and female fish is 1.16:1. Male fish are 19-22 cm and 23-26 cm (small fish), 27-30 cm and 31-34 cm (medium fish), and 35-38 cm and 39-42 cm (large fish). Female fish are 19-24 cm and 25-30 cm (small fish, 31-36 cm and 37-42 cm (medium fish), 43-48 cm and 49-54 cm (large fish).

INTRODUCTION OF PROSPECTIVE FISH AQUACULTURE COMMODITIES Kryptopterus palembangensis

“…Female fish have a body size that is wider and fatter than male fish. In addition, the shape of the head of the male fish is narrower and sharper when compared to the female fish (Suhendra et al, 2013).…”

“…Lais fish are in the freshwater fish group, commonly found in lowland floodplain waters. According to Suhendra et al, (2013), this flooded river ecosystem is affected by fluctuations in rainfall, during the rainy season the water is distributed throughout the plains, but during the dry season, only the main channel and the lower part of the waters remain filled or remain inundated. Lais fish are often found in calm water on floodplains and if they move to rivers, these fish will occupy vegetated riverbanks or depressions in the riverbed during dry periods.…”

“…In general, fish in the tropics with mature gonads will spawn when the water level increases during the rainy season, causing a decrease in water temperature (Sihotang 2005). This situation also applies in the waters of the Sambujur River Fishery Reserve, Lais fish are thought to have a spawning season once a year with a total spawner spawning pattern at the time of the onset of the rainy season where the water level begins to rise and spawn in rock crevices (Suhendra et al, 2013). Then according to the analysis conducted by Prasetiyo (2005); Minggawati & Lukas (2015) gonad samples of lais fish with TKG IV during the rainy season were more numerous than during the dry season, even if you look at the ovaries it is denser and the left and right parts are all ripe.…”