PENDUGAANPARAMETERPERTUMBUHAN,MORTALITAS DANUKURAN PERTAMAMATANGGONAD IKAN GABUS (Channa striata) DI RAWABANJIRAN SUNGAIMUSI

Abstract

Ikan gabus merupakan salah satu jenis ikan ekonomis penting yang banyak dimanfaatkan sebagai bahan baku produk olahan. Habitat ikan gabus di SungaiMusi yaitu banyak dijumpai di rawa banjiran seperti lebak-lebak di SungaiMeriak, Sungai Semuntul dan hutan rawa Danau Cala. Penelitian dilakukan dari bulan Februari–Desember 2010 dengan tujuan untukmengetahui pertumbuhan, mortalitas, laju pertumbuhan dan ukuran pertama matang gonad. Hasil penelitian menunjukkan bahwa selama 11 bulan penelitian didapatkan sampel ikan gabus sebanyak 2.303 ekor dengan kisaran nilai tengah panjang antara 20 - 500 mm, Ikan gabus betina pertama matang gonad berukuran panjang 210 mm sedangkan ikan gabus jantan pada ukuran 185 mm. Dari analisa Ford-Walford diperoleh nilai parameter pertumbuhan dengan panjang asimtotik ikan gabus (L ) sebesar 575,9 mm, koefisien pertumbuhan (K) sebesar 0,173 per tahun dan umur teorits (t0) sebesar - 0,07 per tahun sehingga diperoleh persamaan pertumbuhan Von Bertalanffy untuk ikan gabus adalah Lt = 575,9 (1-e-0,173(t +0,07)). Dugaan laju kematian alami (M) sebesar 0,25 per tahun dan laju kematian karena penangkapan (F) sebesar 0,51 per tahun. Laju eksploitasi (E) ikan gabus sebesar 0,67 per tahun atau sudah melebihi nilai eksploitasi optimumyaitu 0,50.The snakehead fishis considered to be an important food fish.The fishes arewidely used asraw material refined products. Habitat of Channa striata in floodplain of Musi River, there are in Meriak River, Semuntul River and in plood plain of Cala lake. Estimation of population parameters and size at the firstmaturity of female and male snakehead (Channa striata) has been conducted from February 2010 to December 2010. The purpose is to estimate fish population parameters quantitatively including growth of snakehead. The first sexual maturity and natural mortality (M), fishing mortality (Z) and exploitation rates (E) of snakehead.The results of this study showed that 11 month study period we found as many as 2,306 fish samples of channa striata with mediumlength range value between 20 to 500 mm. Size at first sexual maturity for female were 210 mm in length and for males of 185 mm. Based on the analysis of Ford-Walford growth parameter values obtained L = 575.9 mm, and K= 0.173 per year with a valueof t0 = - 0.07. From the values obtained by the Von Bertalanffy growth equation of Channa striata is Lt = 575,9 (1-e 0,173(t +0,07)).Alleged rate of natural mortality (M) of 0.25 per year and the rate of mortality due to fishing (F) of 0.51 per year and exploitation rate (E) fish by 0.67 per year that more exceed the optimum level exploitation (E = 0.5).

Spatial distribution and abundance of Channa striata Bloch1793 in Sempor Reservoir, Kebumen Central Java

“…The size of fish in all five stations is 110-390 mm long, and they weigh 12-558 g. It illustrates a low diversity compared to C.striata caught in the floodplain of Lubuk Lampam, South Sumatera, namely 51-700 mm long and weigh 7-2.997 gram [22], the floodplain of Musi river, i.e., 11-495 mm [23], and Rawa Pening, 240-600mm [5]. Accordingly, the diversity of C.striata in Sempor reservoir, Central Java, from the smallest to the biggest fish, is inferior to Sumatera and Kalimantan.…”

“…KW station has snakehead fish of various lengths and weights, probably because KW station is the primary habitat for snakehead fish. This study shows that snakehead fish caught in Sempor reservoir are longer than those in the floodplain of Musi River, namely 140-189 mm [24] and 200-280 mm [23].…”

“…The sex-based distribution indicates that female fish sized 310-429 mm belongs to the big category and is found in KW station that probably undergoes gonad maturity stage. Female and male snakehead fish enter the first gonad maturity at 210mm and 185mm, respectively, in the floodplain of Musi River [23], and 227,5mm and 322mm, respectively floodplain of Sebangau River watershed, Palangkaraya [20]. Therefore, the KW station is proper for spawning habitat for snakehead fish because it is part of the river estuary of Mampang River and Kedungjati River that provides abundant natural food for snakehead fish.…”

The Evaluation of Fish Growth Parameters and Exploitation of Hemibagrus nemurus In The Kotopanjang Reservoir, and The Sembakung River, Indonesia

“…The hook and line can be adjusted the target depends on the bait, but it is not selected for the size of fish [14]. The exploitation rate on the Kotopanjang Reservoir has been passed the optimum score (E>0.5), which is tended to be overfished [15].…”

Komposisi dan status guild komunitas ikan di Waduk Sempor Jawa Tengah

“…C. striata kelimpahan sedikit karena saat pengambilan S 418 Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan Volume 9, Number 3, Page 411-420 Setyaningrum et al (2020) sampel dilakukan pada musim kemarau yang mengakibatkan tinggi muka air waduk turun Sebagian daerah waduk Sempor mengalami pendangkalan karena tidak ada aliran air yang berasal dari sungai sehingga stasiun pengambilan sampel terbatas hanya 4 stasiun. Kelimpahan ikan gabus di rawa banjiran lebih tinggi dari pada di waduk terutama pada musim penghujan dan bila musim kemarau rawa tersebut surut dan kelimpahannya menurun di rawa banjiran sungai Musi (Nurdawati et al, 2014), di rawa danau Panggang, Kalimantan Selatan (Sofarini et al, 2018) dan di perairan rawa Aopa Watumohai Kecamatan Angata Kabupaten Konawe Selatan (Cia et al, 2018).…”