STRUKTUR UKURAN DAN TINGKAT PEMANFAATAN IKAN LENCAM (Lethrinus lentjan Lacepede, 1802) PERAIRAN ARAFURA DI PROBOLINGGO

Abstract

AbstrakPenangkapan ikan di perairan Arafura banyak dilakukan oleh nelayan dari Pulau Jawa diantaranya Jakarta, Probolinggo, Pati, dan Indramayu. Nelayan dari Probolinggo yang menangkap ikan di perairan Arafura (WPP 718) menggunakan alat tangkap jaring dan pancing rawai dengan tujuan utama adalah ikan demersal, yaitu kakap (Lutjanus spp.), kerapu (Epeniphelus spp.), lencam (Lethrinus lentjan.), dan lainnya. Pemanfaatan ikan demersal terutama ikan lencam (Lethrinus lentjan) yang terus-menerus akan memicu terjadinya perubahan stok populasi ikan di perairan, sehingga diperlukan analisa ilmiah sebagai dasar pengelolaan perikanan. Tujuan dari analisa ilmiah ini untuk menjadi nilai kontrol dalam pengawasan jumlah eksploitasi ikan dan bahan pengkajian stok ikan lencam (Lethrinus lentjan). Penelitian dilakukan Februari hingga Desember 2017 di TPI Mayangan Probolinggo. Struktur ukuran ikan 23–65 cmFL dengan dominan pada ukuran 50 cmFL dengan ukuran pertama kali tertangkap (Lc) 44,5 cmFL. Laju pertumbuhan (K) 0,32 per tahun dengan panjang asimtotik 74 cmFL. Tingkat kematian karena penangkapan (F) lebih tinggi daripada tingkat kematian alami (M) dan tingkat eksploitasi E = 0,57%, yang berarti telah terjadi overfishing. Pengurangan eksploitasi sebesar 14%, dan penetapan ukuran layak tangkap serta ukuran legal diperdagangkan dapat menjadi upaya dalam dalam menjaga populasi ikan lencam.Abstract Fishing in Arafura waters is mostly done by fishermen from Java, including Jakarta, Probolinggo, Pati, and Indramayu. Fishermen from Probolinggo who catch fish in Arafura waters (FMA 718) use fishing nets and longline fishing with the main purpose being demersal fish, namely snapper (Lutjanus spp.), Groupers (Epeniphelus spp.), Lencam (Lethrinus lentjan) and others. Exploitation of demersal fish, especially lencam fish (Lethrinus lentjan) which will continually trigger changes in fish population stock in waters, so the scientific analysis is needed as a basis for fisheries management. The purpose of this scientific analysis is to become a control value in monitoring the amount of fish exploitation for fish stock assessment (Lethrinus lentjan). The study was conducted from February to December 2017 at TPI Mayangan Probolinggo. The size structure of fish 23–65 cmFL with a dominant size of 50 cmFL with the length at first capture (Lc) 44.5 cmFL. Growth rate (K) 0.32 per year with an asymptotic length of 74 cmFL. The fishing mortality (F) is higher than the natural mortality (M) and the exploitation level E = 0.57%, which means overfishing has occurred. The 14% reduction in exploitation and the determination of catch size and legal size of trade can be an effort in maintaining fish populations.

The Fishing Grounds and the Exploitation Status of Kawakawa (Euthynnus affinis) in Java Sea, Indonesia

“…However, in addition to food, the difference in fish size is also influenced by the selectivity of the fishing gears, i.e. the mesh size or the hook size, used to fish (Pane et al 2020).…”

“…In addition, according to Rohit et al (2012), their foods are 77% various types of fish, 14% crustaceans, and 9% mollusks, while according to (Widodo et al 2014) they eat all types of fish as well as Clupea, squids, crustaceans, and zooplanktons. et al (2019) Recruitment is a process of adding individuals into waters that are the targets of fishing activities and related to the fish reproduction (Pane et al 2020). According to Noegroho and Chodrijah (2015), recruitment is influenced by the number of mature female fish that are ready to spawn, mortality during spawning, and the number of fish that reach the stock size.…”

Yellowstripe scad fishery (Selaroides leptolepis) in FMA 712: a short review

“…This size is still smaller than those caught in the waters of Tomini Bay between 9.5-22.2 cm TL, Wondaman Bay 10-24 cm TL, Ternate 8.2-21.7 cm TL and 5.65-31.82 cm TL and larger than in the Sunda Strait waters 9-18 cm TL and Matang Malaysia 9-17.5 cm TL [21,[29][30][31][32][33]. The difference in the size structure of the caught fish can be caused by differences in fishing gear and mesh sizes used in various waters [13].…”

“…In general, the exploitation of small pelagic fish in FMA 712 based on the Decree of the Minister of Marine Affairs and Fisheries Number 19 of 2022 concerning the Estimation of Potential Fish Resources, Amount of Permissible Fish Catch, and Level of Exploitation of Fish Resources in the State Fisheries Management Area of the Republic of Indonesia is still in the moderate stage (E = 0.4). However, a resource assessment still needs to be done as a basis for management because the increase in fishing pressure affects the change structure population and the level of exploitation which can also disrupt the condition of resource stocks in the waters [13,14]. Many studies on the management of purse seine fishing activities in the Java Sea (FMA 712) have been operated, but they do not specifically discuss the yellowstripe scad (Selaroides leptolepis) and its exploitation rate [1,6,[15][16][17].…”

STATUS PERIKANAN LENCAM (Lethrinus lentjan) DI PERAIRAN TELUK BONE

“…Untuk mengetahui perbandingan jenis kelamin maka pengetahuan tentang nisbah kelamin sangat dibutuhkan sehingga bisa diduga jumlah ikan jantan dan ikan betina dilihat dari tingkat keseimbangannya (Andy Omar, 2011), umumnya ikan yang termasuk dalam family Lethrinidae salah satunya ikan lencam (Lethrinus lentjan) termasuk group hermaprodit protogini yaitu spesies yang mengalami kelamin yang bisa berubah (gonad) dari jantan ke betina (Pane, Nurulludin, Widiyastuti, & Suman, 2020) Berdasarkan hasil analisis didapatkan bahwa di peroleh Thitung = 0,4716 dan Ttabel = 3,84, Sehingga nilai chi-kuadrat (x²) hitung < chi-kuadrat (x²) Tabel (x² hitung < x² Tabel). Kondisi ini menunjukkan bahwa H0 diterima tjadi hasilnya sama jumlah ikan jantan dan ikan betina.…”