Length-weight relationship, sex ratio, mortality and growth condition of natural stock of Macrobrachium rosenbergii from the estuarine systems of North Kalimantan, Indonesia

Abstract

Abstract. Indarjo A, Salim G, Nugraeni CD, Zein M, Ransangan J, Prakoso LY, Suhirwan, Anggoro S. 2021. Length-weight relationship, sex ratio, mortality and growth condition of natural stock of Macrobrachium rosenbergii from the estuarine systems of North Kalimantan, Indonesia. Biodiversitas 22: 846-857. Giant prawns (Macrobrachium rosenbergii) in North Kalimantan Province, Indonesia are commonly found inhabiting estuarine areas in Salimbatu Village (Bulungan District), Tepian Village (Nunukan District) and Buong Baru and Sesayap Villages (Tana Tidung District). The present study was conducted to analyze the relationship between length and weight, sex ratio, mortality, and growth condition index of the naturally occurring giant prawns in three districts namely Bulungan, Nunukan, and Tana Tidung in the North Kalimantan Province, Indonesia. The samplings were carried out for a period of seven months beginning April to November 2020. The results revealed that the giant prawns in Buong Baru Village, Sesayap Village, and Salimbatu Village were characterized to have negative allometric growth patterns. Interestingly, the male giant prawns in Tepian Village were observed to exhibit positive allometric growth pattern. The ratio sex analysis of the giant prawns in the four villages indicated that female prawns were more than male. In terms of size distribution, Salimbatu Village exhibited 60.1% of prawns measured at 14.02-17.74cm (size range of 10.3-47.5 cm). In Tepian Village, 32.9% of the prawns were observed to measure between 11.20-12.80 cm (size range of 8.0-24.0 cm). In Buong Baru Village, it was observed 18.5% of the prawns measured 22.0-25.5 cm and 29.0-32.5 cm (size range of 15.0-50.0 cm), respectively. Finally, 28.3% of the prawns in Sesayap Village was observed to measure at 12.19-14.02 cm from the overall size distribution between 6.7-25.0 cm. Relative condition factor of giant prawns found in the waters of Salimbatu Village, Tepian Village, and Buong Baru Village waters and Sesayap Village waters was characterized by thin body shape. The maximum length of male prawns was higher than female prawns in Salimbatu Village, Desa Tepian and Sesayap Village, except in Buong Baru Village where female was longer than male. The exploitation rate and fishing mortalities of prawns were higher in Buong Baru Village, Tana Tidung District. Giant prawn fishery contributes to the socio-economic development of the people in North Kalimantan. Hence, sustainable fishery management of this species, particularly in Buong Baru Village is urgently needed so that it can continue to provide livelihoods to the fishermen in the area.

Characteristics of Model Growth And Mortality of White Shrimp (Penaeus merguiensis de Man 1888) in The Estuaria of Bengara, Regency Bulungan

“…According to [24] explained that the conditions of the aquatic environment such as temperature, salinity, pH and geographical location can affect the growth of shrimp both negative allometry or positive allometry. According to Modification of [25] in [14] ; [15] ; [35] ; [16] ; [17] ; [20] ; [9] ; [10] ; [12] explaining the condition index criteria, there are five categories, namely very thin body shape with a range of 0.01-0.49; thin body shape with a range of 0.5-0.99 ; proportional body shape with a value of 1 ; fat body shape with a range of 1.01-1.50 and very fat body shape with a value> 1.51. Based on the condition index criteria for P.merguiensis, it can be seen in Figure 3 which explains that the male and female P.merguiensis shrimp body shape models have the same body composition, namely thin, proportional, fat and very fat body shapes.…”

“…The index condition factor according to [9] ; [10] ; [7] ; [11; [12] explains that the value is to get the body shape pattern of each individual aquatic biota species. The condition index was then compared with the index suggested by [14] ; [15] ; [16] ; [17] ; [18] ; [19] ; [20] ; [9] ; [10]; [7] ; [12].…”

Growth Patterns and Mortality of Lobster Panulirus ornatus from the Catch of Bottom Gill Net Fishers in the Western Waters of Tarakan Island

“…The condition index of the P. ornatus was grouped into five categories, i.e. very flat (0.01-0.50), flat (0.51-0.99), proportional/ideal (1), fat (1.01-1.50), and obese (>1.50) (Firdaus et al 2020;Indarjo et al 2021). Meanwhile, the allometric growth and the isometric growth and its respective condition factors were analyzed based on the methods suggested by Weatherley (1972) and Lagler (1949), respectively.…”

Growth pattern and the condition index of nomei fish Harpodon nehereus captured with mini-trawl in Tarakan Waters

“…Condition indexs of the H. nehereus was grouped into five categories i.e. very thin (0.01-0.50), thin (0.51-0.99), proportional/ideal (1), fat (1.01-1.50), and the very fat (>1.50) [10]; [11]; [12]; [13]; [14]; [15]. Meanwhile the allometric growth and the isometric growth were analyzed based the methods suggested by [16] and [17], respectively.…”