Length weight relationship, growth parameter, and condition factor of caroun croaker Johnius carouna (Cuvier, 1830) in the Southern waters of Java

Abstract

Caroun croaker (Johnius carouna) is one of demersal fishes which are commonly caught in the south of Java waters. This fish captured by trammel net, gillnet, danish seine and mini trawl. This study aims to determine length and weight relationship, growth parameter, length frequency distribution and condition factors of croaker fish caught in the south of Java waters. This study was conducted from January-December 2015 at the Cilacap Ocean Fisheries Port, Central Java. Data collected was total length (TL in mm) and weight (W in g) of caroun croacker fish. A total of 2141 of Caroun croaker was caught by mini trawl during the sampling periods. The result showed that the size of croaker fish caught by mini trawl ranged between 85-225 mm with an average was 143.7 mm. Length and weight relationship expressed by equation of W = 0.0062 TL3.2889 ( R2 = 0.9443). The growth pattern of croaker fish was allometric positive. The Von Bertalanffy growth equation of caroun croacker fish in south of Java waters was Lt =155 (1 - e -0.9(t+0.2127)) with the asymptotic length (L∞) =155 mm, growth coefficient (K) = 0.9 per year and the theoretical age croaker fish that was equal to (t0) = - 0,2127.

KEANEKARAGAMAN HASIL TANGKAPAN MENGGUNAKAN ALAT TANGKAP JARING INSANG DASAR (Bottom Gill Net) 2 INCHI DI KELURAHAN KAMPUNG NELAYAN KECAMATAN TUNGKAL ILIR

“…Berdasarkan Tabel 2 ukuran ikan gulamah yang didapatkan memiliki panjang rata-rata 20 cm, pengukuran panjang yang diperoleh dan dilihat dari ciri morfologinya menunjukkan bahwa ikan gulamah merupakan ikan dewasa yang layak untuk ditangkap dan sudah dapat melakukan pemijahan dimana ukuran panjangnya 10,5 cm sampai 21,6 cm (Siagian et al, 2017). Hasil tangkapan ikan gulamah pertama kali tertangkap dan sudah layak tangkap adalah berukuran 153,4 mm (15,34 cm) (Faizah et al, 2019). Ikan lomek yang didapatkan pada saat penelitian panjang rata-ratanya yaitu 25 cm, dimana ikan ini sudah termasuk layak tangkap.…”

Length and weight relationship, condition factors, and growth parameters of Gulamah fish (Johnius trachycephalus) landed at Tanjung Beringin’s Fish Auction Place (TPI) Serdang Bedagai Regency, North Sumatera Province

“…In the third month of August, gulamah fish tend to be smaller because they enter the juvenile stage growth of young fish. This is by following [2], which states that August-…”

“…Gulamah belonging to one of the demersal fish be alive in brackish waters [1]. The type and nature of the water that the gulamah prefers are low-temperature, non-transparent and muddy waters [2]. From observations, it was found that there was an increase in the price of wet gulamah fish (Rp 20,000.00/kg) if it was processed into salted fish (Rp 45,000.00/kg), making this fish catch done daily to meet market needs.…”

Hubungan Panjang-Bobot dan Faktor Kondisi Ikan Julung-julung (Hemiramphus sp.) Teluk Tomini, Gorontalo

“…Faktor kondisi dihitung dengan menggunakan sistem metrik berdasarkan hubungan panjang bobot ikan sampel. Jika pertambahan bobot seimbang dengan pertambahan panjang maka pertumbuhan ikan bersifat isometrik sehingga persamaan untuk menghitung faktor kondisi menggunakan rumus: 𝐊 = 𝟏𝟎 𝟓 𝐖/𝐋𝐊 Apabila pertumbuhan bersifat allometrik yakni pertambahan panjang dan pertambahan bobot tidak seimbang, maka persamaannya menjadi 𝐊 = 𝐖 𝐚𝐋 𝐛 Dimana : K merupakan faktor kondisi, W merupakan bobot ikan (gram), L merupakan panjang total ikan (mm) a dan b adalah konstanta (Faizah & Anggawangsa, 2019).…”