Distribution and length-weight relationships of Hilsa shad Tenualosa ilisha in the Bilah River, Labuhanbatu Regency, North Sumatera Province, Indonesia

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

Length–weight relationships and condition factors of mullets Liza macrolepis and Moolgarda engeli (Pisces: Mugilidae) harvested from Lambada Lhok waters in Aceh Besar, Indonesia

“…According Muchlisin et al 22 , besides being affected by the environmental factors, the growth pattern of fish is also influenced by fish behavior; for example, the fish that were active swimmer had a lower b value than those that were passive swimmers [48][49][50] .…”

Hubungan Panjang Berat dan Faktor Kondisi Ikan Gulamah (Johnius trachycephalus) di Perairan Sungai Barumun Kabupaten Labuhanbatu

“…(Fauzi et al, 2013) Lobster Batu (Panulirus penicilatus). Penelitian lain juga dilakukan oleh: (Ramses et al, 2020) dengan menggunakan sampel ikan Belanak (Mugilidae), penelitian yang sama juga dilakukan oleh (Nurhayati et al, 2016), kemudian (Lau et al, 2020) pada ikan Kapas-kapas (Gerres filamentosus), dan (Efendiansyah, 2018) Ikan Keparas (Cyclocheilichtyhys apogon) di Bangka, (Machrizal et al, 2019) pada ikan Terubuk, dan beberapa penelitian lainnya, seperti: (Ibrahim dan Setyobudiandi, 2017) ikan Selar Kuning (Selaroides leptolepis), (Sulistiyarto, 2012) ikan Saluang, (Muthmainnah, 2013) ikan Gabus, (Nasir et al, 2016) ikan Betutu, (Fuadi et al, 2016) penelitian ikan Laut Aceh, kemudian (Abubakar et al, 2019) meneliti ikan Kembung di Perairan Halmahera, dan terakhir (Santoso dan Susilo, 2016) pada ikan Tenggiri. Namun, secara khusus penelitian yang membahas tentang panjang, berat, dan faktor kondisi ikan Gulamah masih jarang dilakukan.…”

Length–weight relationships and condition factors of mullets Liza macrolepis and Moolgarda engeli (Pisces: Mugilidae) harvested from Lambada Lhok waters in Aceh Besar, Indonesia

“…Moreover, Sandhya and Shameem 29 observed a negative growth pattern in L. macrolepis in polluted waters, in contrast to an isometric growth pattern in unpolluted waters. According Muchlisin et al 22 , besides being affected by the environmental factors, the growth pattern of fish is also influenced by fish behavior; for example, the fish that were active swimmer had a lower b value than those that were passive swimmers [45][46][47] .…”