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All Journal Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology JFMR (Journal of Fisheries and Marine Research)
Pramurdya, Yesika Nanda
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Engineering Environmental Science

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POPULASI DAN RASIO POTENSI PEMIJAHAN IKAN CAKALANG (Katsuwonus Pelamis (Linnaeus, 1758)) DI PERAIRAN SELATAN BALI Pramurdya, Yesika Nanda; Watiniasih, Ni Luh; Ginantra, I Ketut
Saintek Perikanan : Indonesian Journal of Fisheries Science and Technology Vol 18, No 4 (2022): SAINTEK PERIKANAN
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijfst.18.4.195-204

Abstract

Penurunan hasil tangkapan ikan cakalang di wilayah Selatan Bali diduga merupakan mekanisme terjadinya tangkap lebih. Tujuan dari penelitian ini adalah mengestimasi populasi dan stok ikan cakalang menggunakan metode rasio potensi pemijahan, dalam menunjang keberlanjutan sumberdaya ikan cakalang di wilayah Selatan Bali. Penelitian ini dilaksanakan pada bulan Juni sampai Desember 2021. Pengumpulan data dilakukan melalui observasi lapangan di UPTD TPI Kedonganan. Teknik sampling yang digunakan adalah stratified random sampling. Struktur panjang cagak ikan cakalang berkisar antara 24.1 – 27.1 cm FL sampai 55.1 – 58.1 cm FL dengan pola pertumbuhan bersifat allometrik positif. Persamaan laju pertumbuhan adalah Lt = 59.7 (1 - ). Nilai F sebesar 1.14; nilai M sebesar 0.488; nilai Z sebesar 1.628 dan nilai E sebesar 0.7 (E >0.5) per tahun yang mengindikasikan bahwa telah terjadi tangkap lebih. Tingkat Kematangan Gonad (TKG) dan klasifikasi perkembangan gonad didominasi oleh ikan yang sudah matang gonad dengan nilai Lm ikan cakalang betina adalah 41.28 cm FL dan Lm ikan cakalang jantan adalah 41.29 cm FL. Stok ikan cakalang berada dalam kondisi overexploited yang ditunjukkan dari nilai SPR sebesar 19% (SPR <20%). Decreasing catches of skipjack in Southern Bali waters is thought to be a mechanism for overfishing. The aim of this study is to  estimate population and stock of skipjack tuna using spawning potential ratio method, in order to maintain the sustainability of this species in the southern region of Bali. This research was carried out from June to December 2021. Data collection was carried out through field observations at UPTD TPI Kedonganan. A stratified random sampling method was used as the chosen sampling technique in this study. The fork length (FL) structure of skipjack tuna ranges from 24.1-27.1 cm FL to 55.1-58.1 cm FL with a positive allometric growth pattern. The growth rate equation is Lt = 59.7 (1 - ). The F value is 1.14; M value = 0.488; Z value = 1.628; and E value = 0.7 (E > 0.5) per year, respectively. This indicates that overfishing has occurred in the area. Gonad Maturity Level (TKG) and gonad development classification were dominated by mature fish with the Lm value of female and male skipjack tuna being 41.28 cmFL and 41.29 cmFL. The results of another analysis showed that skipjack tuna stock was in an overexploited condition as indicated by the SPR value of 19% (SPR <20%).
PENDUGAAN UMUR CAKALANG, Katsuwonus pelamis (Linnaeus, 1758) YANG DIDARATKAN DI UPT P2SKP PONDOKDADAP SENDANGBIRU MELALUI ANALISIS LINGKARAN UMUR Pramurdya, Yesika Nanda; Jatmiko, Irwan; Rahman, Muhammad Arif; Raka Wiadnya, Dewa Gede
JFMR (Journal of Fisheries and Marine Research) Vol. 3 No. 3 (2019): JFMR
Publisher : Faculty of Fisheries and Marine Science, Brawijaya University, Malang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2019.003.03.12

Abstract

Abstract Length-growth analysis of fish cannot be completed without age information. Age study on skipjack has been done through analysis of its first-hard dorsal fin. Sampling was done using 11 fish specimen taken from UPT P2SKP Pondokdadap Sendangbiru, from January to February 2018. Species identification follows the FAO standard procedure (species identification sheet) published 2001. A specimen was deposited at Depository Ichtyologicum Brawijaya with code DIB.FISH 111103. The first hard spine of 11 fish samples were cut with IsoMet low speed cutting machine at 50 mm thickness. The preparates were then analyzed using biological binocular microscope at 40x magnification. The results showed differences in number of growth annuli (annual growth-ring) at different fish length (FL). The number of annuli varied between 4 - 6+ age year at fish length (FL) variation between 38 and 62 cm. These values were closely related to those with other methods such as Modal Progression Analysis (MPA). The number of samples successfully analyzed (5 specimen) were not sufficient for analysis of length-growth parameters (L∞, k and t0). Also, this technique did not apply for age less than yearly unit, but quite affordable (Rp.50.000,- per sample) for a fairly variable amount of specimens. 
Co-Authors Dewa Gede Raka Wiadnya, Dewa Gede I Ketut Ginantra Irwan Irwan Ni Luh Watiniasih Rahman, Muhammad Arif