Electronic Theses and Dissertation

Macrobrachium lanchesteri merupakan jenis udang air tawar yang tersebar di danau laut tawar, kabupaten aceh tengah. informasi mengenai karakter reproduksi udang di danau laut tawar belum pernah dilakukan. penelitian ini bertujuan untuk menganalisis karakter reproduksi udang m. lanchesteri yang meliputi seksualitas, nisbah kelamin, indeks kematangan gonad (ikg), dan fekunditas. penelitian ini dilakukan pada januari 2024 di danau laut tawar, kabupaten aceh tengah dengan empat stasiun pengambilan sampel antara lain one-one, toweren, mendale, dan kala bintang. pengambilan sampel menggunakan metode acak sederhana. sampel dianalisis di laboratorium kesehatan ikan dan lingkungan, bbi lukup badak, kabupaten aceh tengah. hasil penelitian menunjukkan karakter penciri m. lanchesteri jantan dan betina berdasarkan pengukuran morfometrik terdapat pada kedalaman ruas keenam (drn), panjang rostrum (rst), dan panjang ruas kedua (prd). karakter meristrik m. lanchesteri memiliki pleura sebanyak enam ruas, jumlah gerigi rostrum atas sebanyak enam hingga tujuh, jumlah gerigi rostrum bawah sebanyak tiga hingga empat, dan jumlah duri telson sebanyak dua. distribusi ukuran panjang karapas udang penelitian ini memiliki 8 kelas dengan lebar kelas 0,126 cm. udang mulai bertelur pada ukuran panjang 0,499 cm. nisbah kelamin tidak seimbang dengan perbandingan udang jantan dan udang betina 1:5,32. rata-rata indeks kematangan gonad (ikg) udang sebesar 16,3% sampai 17,1%. fekunditas relatif sebanyak 176-239 butir/gram berat udang. koefisien korelasi (r) hubungan fekunditas dengan berat tubuh sebesar 0,52 sedangkan hubungan fekunditas dengan panjang karapas sebesar 0,50. pola pertumbuhan m. lanchesteri di danau laut tawar bersifat allometrik negatif dengan nilai b=0,6936. kisaran faktor kondisi udang antara 0,95-1,21 yang berarti memiliki bentuk tubuh kurus dan gemuk. kata kunci: udang air tawar, reproduksi, seksualitas, danau laut tawar

Macrobrachium lanchesteri is a type of freshwater shrimp distributed in Laut Tawar Lake, Central Aceh Regency. Information regarding the reproductive characteristics of shrimp in Laut Tawar Lake has never been carried out. This study aims to analyze the reproductive characteristics of M. lanchesteri shrimp which include sexuality, sex ratio, gonad maturity index (IKG), and fecundity. This research was conducted in January 2024 at Laut Tawar Lake with four sampling stations including One-one, Toweren, Mendale, and Kala Bintang. Sampling used a simple random method. Samples were analyzed at the Fish and Environmental Health Laboratory, BBI Lukup Badak, Central Aceh Regency. The results showed that the characteristics of male and female M. lanchesteri based on morphometric measurements were the depth of the sixth segment (DRN), rostrum length (RST) and second segment length (PRD). The meristric character of M. lanchesteri has six pleura segments, six to seven upper rostrum serrations, three to four lower rostrum serrations, and two telson spines. The distribution of shrimp carapace length in this study has 8 classes with a class width of 0.126 cm. Shrimp begin to lay eggs at a length of 0.499 cm. The sex ratio is unbalanced with a ratio of male shrimp to female shrimp of 1:5,32. The average shrimp gonad maturity index (IKG) is 16.3% to 17.1%. The relative fecundity is 176-239 eggs/gram weight of shrimp. The correlation coefficient (r) between fecundity and body weight was 0.52, while the correlation between fecundity and carapace length was 0.50. The growth pattern of M. lanchesteri in Laut Tawar Lake is negative allometric with a value of b=0.6936. The range of shrimp condition factors is between 0.95-1.21, which means having a thin and fat body shape. Keywords: freshwater shrimp, reproduction, sexuality, Laut Tawar Lake