Abstract
Hilsa shad Tenualosa ilishais of the indigenous fish species and the icon of the Labuhanbatu Regency, Indonesia. Presently, a very limited study was done in this species. Hence, the purpose of this study was to analyse the distribution and growth patterns based on the length-weight relationship of Hilsa shad T. ilishaon Bilah River, Labuhanbatu District, Sumatera Utara Province, Indonesia. Sampling was carried out for 3 months starting in February-April 2019 with the exploration method. Determination of sampling locations based on information from local fishermen. Analysis of distribution data used the Morisita index and growth patterns used the Linear Allometric Model (LAM). The analysis results of Hilsa shad distribution indicated that these fish were distributed in groups/clustered with the Morisita index value of 2.211-2.314. The growth pattern of the fish was negative allometric with a value of b3. Correlation analysis showed that DO was closely related to distribution (r2=0.661), meanwhile, light penetration was closely related to growth patterns (r2=0.914). It is concluded that the distribution of Hilsa shad fish in the Bilah River was in groups or clustered, with a negative allometric growth pattern. Keywords: Hilsa Shad, distribution, growth pattern, Tenualosa ilisha
Highlights
Hilsa shad is a pelagic group of fish from the Clupeidae family commonly known as herring in Europe
The results showed that Hilsa shad is distributing in groups or clustered with the Morisita index value of 2.211-2.314
It is concluded that the distribution of Hilsa shad fish in the Bilah River was in groups or clustered with a negative allometric growth pattern
Summary
Tenualosa ilisha is one of the fish that has become the icon of Labuhanbatu These fish are distributed in several regions of Asia and the Middle East waters (Hashemi et al, 2010; Karim et al, 2019). This species is an anadromous fish, it can be found in freshwater, brackish water, coastline and sea (Hossain et al, 2014). This fish is the main target for fishing by local fishermen. According to Efizon et al (2012) and Jihad et al (2014), the Hilsa shad populations in Labuhanbatu waters have been sharply declined over the years, this was due to intensive fishing especially the broodfish to collect the eggs for commercial used
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