Carapace Length-Weight Relationship and Condition Factors of Macrobrachium rosenbergii in The Rivers of Riau Province, Indonesia

Abstract

Macrobrachium rosenbergii in Riau Province are almost found in all inland waters, especially in the big rivers, namely Indragiri, Kampar, Siak and Rokan. This species are still the main catch of fishermen even the catch has decreased. Deforestation along the watershed, decreasing water quality and habitat have a very bad impact on Macrobrachium rosenbergii. This study was conducted to determine the relationship of carapace length-weight and the condition factor of Macrobrachium rosenbergii in the rivers of Riau Province. The study used a survey method from May to June 2021. Data collection was carried out in the rivers of Riau Province at the center for giant prawns. Sampling was done randomly from the catches of fishermen. The biological parameters measured were carapace length and weight. The results showed that the relationship between carapace length and weight of giant prawns in the Siak River, Rokan River and Kampar River are 0.0008L2.8473, 0.0049L2.3906 and w = 0.0014L2.643, respectively. The length of the carapace can determine the weight of prawns up to 78.62-96.62%, where the relationship between carapace length and weight is very close. The growth pattern of giant prawns is allometric and the condition factor is 1.03-1.05.