ARNANDYA, ALYA FARANIDA (2023) STRUKTUR UKURAN, HUBUNGAN LEBAR KARAPAS – BOBOT DAN TINGKAT KEMATANGAN GONAD (TKG) KEPITING BATU (Menippe mercenaria, Say 1818) DI PERAIRAN TELUK AWUR, JEPARA (23dsa215). Undergraduate thesis, Fakultas Perikanan dan Ilmu Kelautan.

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Abstract

ABSTRAK
(Alya Faranida Arnandya. 26010118120027. Struktur Ukuran, Hubungan Lebar Karapas – Bobot dan Tingkat Kematangan Gonad (TKG) Kepiting Batu (Menippe mercenaria, Say 1818) di Perairan Teluk Awur, Jepara. Suradi Wijaya Saputra dan Anhar Solichin).

Kepiting Batu (Menippe mercenaria) merupakan salah satu spesies kepiting yang sering ditemukan di zona intertidal seperti di karang dan di area yang ditumbuhi mangrove. Kepiting Batu batu merupakan tangkapan sampingan di perairan Teluk Awur, Jepara dan belum dilakukan pendataan dan penelitian sehingga menyebabkan kurangnya informasi dan pemahaman tentang kepiting batu. Tujuan Penelitian adalah mengkaji beberapa aspek biologi kepiting batu yang meliputi struktur ukuran, hubungan lebar karapas – bobot, Tingkat Kematangan Gonad (TKG), faktor kondisi, ukuran pertama kali matang gonad (Lm 50%) dan
ukuran pertama kali tertangkap (Lc 50%) di perairan Teluk Awur. Pengambilan data dilakukan pada bulan Mei, Juli dan September 2022. Metode penelitian dilakukan dengan metode survei yaitu aspek yang diambil dari 1 sampel yang diambil dari 1 populasi yang cukup besar. Pengambilan sampel dilakukan dengan metode
sistematik random sampling yaitu pengambilan data yang diambil berdasarkan lokasi dan dalam selang waktu yang sama. Data primer yang dikumpulkan yaitu lebar karapas (mm) dan bobot (gram). Analisis data menggunakan Microsoft Excel. Hasil pengamatan didapatkan rentang struktur ukuran lebar karapas total berkisar 29 – 82 mm dari total sampel 150 ekor. Hubungan lebar karapas – bobot diperoleh dari persamaan W = 0,00348L 2,468787204 yang menunjukkan pertumbuhan kepiting alometrik negatif dan nilai faktor kondisi berkisar 0,9 – 1,6 artinya bentuk tubuh tidak gemuk. Tingkat Kematangan Gonad didominasi oleh TKG I artinya hasil tangkapan kepiting Batu didominasi oleh kepiting yang belum matang gonad. Nilai Lc 50% bernilai 43,48 mm dan nilai Lm 50% bernilai 59,82 mm. Hasil Lc < Lm mengindikasikan bahwa M.mercenaria di perairan Teluk Awur belum pernah mengalami pemijahan sebelum tertangkap. Hasil tersebut menggambarkan upaya optimalisasi pengelolaan perlu dilakukan untuk menjaga keberlanjutan sumberdaya.

Kata Kunci: aspek biologi, alometrik, Lm, Lc.

ABSTRACT
(Alya Faranida Arnandya. 26010118120027. Size structure, LengthWeight Relationship and gonadal maturity level of Menippe mercenaria (Say,1818) in Teluk Awur Strait, Jepara. Suradi Wijaya Saputra dan Anhar Solichin).

Stone Crab (Menippe mercenaria) is one of the crab species that have been found in intertidal area such as coral and mangrove area. Stone crab included as by-catch arrest on Teluk Awur strait, but the data collection and research has not been carried out, causing lack of information about stone crab. The purpose of this research was conducted to examine biological aspect such as size structure, lengthweight relationship, condition factor, TKG, Lm 50% and Lc 50% of Menippe mercenaria, based on monthly catches landed at Teluk Awur strait on May, July, and September 2022. The research method was carried out using a survey method, namely the units and aspects of the sample taken by more than 1 population. Sampling was carried out by a systematic random sampling namely data collection taken based on location and at the same interval time. The primary data collected were carapace width (mm) - weight (grams) and the data was analyzed using Microsoft Excel. The result shows that total width size of stone crab ranged from 29 – 82 mm from the total sample of 150 species. Width-weight relationship described as W = 0,00348L
2,468787204 with the growth pattern categorized as negatif allometric, and the condition factor of stone crab ranged from 0,9 – 1, 6, means that the body shape is flat. The level of gonad maturity (TKG) dominated by TKG I, shows that mostly the stone crab catches are dominated with undeveloped gonad maturity level. The length of first capture (Lc) is 43,48mm, smaller than the length of first maturity (Lm) 53,82mm. The result Lc< Lm indicates that M.mercenaria in Teluk Awur Strait had never been spawned before being caught. This result shows that optimization management options are proposed in order to keep the sustainability of the resources.

Keywords: biological aspect, allometric, Lm, Lc

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