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POPULASI LOBSTER AIR TAWAR (
Cherax quadricarinatus)
DI PERAIRAN DANAU TOBA, DESA MARLUMBA,
KECAMATAN SIMANINDO, KABUPATEN SAMOSIR,
SUMATERA UTARA
ABSTRAK
Penelitian ini telah dilakukan di perairan Danau Toba, Desa Marlumba pada bulanFebruari 2016. Penentuan titik lokasi penelitian menggunakan metode “Purposive Sampling” dengan menentukan tiga stasiun berdasarkan aktivitas masyarakat di danau tersebut. Alat yang digunakan dalam penangkapan lobster adalah bubu. Banyaknya individu lobster yang diperoleh dari hasil tangkapan di ketiga stasiun sebanyak 54 ekor, dari stasiun I sebanyak 16 ekor, stasiun II sebanyak 29 ekor dan stasiun III sebanyak 9 ekor. Kepadatan lobster tertinggi ditemukan pada stasiun II dengan nilai 0,033 ind/m2. Berdasarkan hasil penelitian pada ketiga stasiun, pola pertumbuhan lobster pada stasiun I dan III bersifat alometrik positif, dimana nilai koefisien pertumbuhan pada stasiun I adalah 3,132dan stasiun III adalah 3,739. Sedangkan, pola pertumbuhan pada stasiun II bersifat alometrik negatif dengan nilai 2,68. Berdasarkan hasil analisis korelasi pearson, nilai BOD5 berkorelasi sangat kuat terhadap kepadatan lobster air tawar.
Kata kunci: Cherax quadricarinatus, Danau Toba, Lobster Air Tawar
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POPULATIONS OF FRESHWATER CRAYFISH
(Cherax
quadricarinatus)
IN THE WATERS OF LAKE TOBA,
MARLUMBA VILLAGE, DISTRICT SIMANINDO, SAMOSIR
REGENCY, NORTH SUMATERA
ABSTRACT
This study has been conducted at Lake Toba, Marlumba village during February 2016. Purposive sampling method was used to determine three stations of the research based on community activities at the lake. Tools were used for catching freshwater crayfishes “Bubu”. Numbers of freshwater crayfishes caught from all stations are 54 individuals consisted of 16 individuals from 1st station, 29 individuals from 2nd station and 9 individuals from 3rd station. The highest density was found at the second station with the number 0,33 ind/m2. According to the result from all station, the growth pattern of freshwater crayfishes at 1st and 3rd station is allometric positive with growth coefficient for 1st station is 3,132 and 3rd station is 3,739. Meanwhile, the growth pattern of 2nd station is allometric negative with growth coefficient is equal to 2,680. Pearson correlation analysis indicated that the BOD5 value are strongly correlated with the density of freshwater crayfishes.
Keywords: Cherax quadricarinatus, Lake Toba, Crayfish
