PARAMETER POPULASI IKAN KAKAP MERAH (Lutjanus malabaricus) DI PERAIRAN LAUT CINA SELATAN

Abstract

ABSTRAKIkan kakap merah merupakan salah satu ikan demersal yang rentan terhadap penangkapan dan mempunyai pengaruh dalam keseimbangan ekosistem. Penelitian dilakukan pada Mei-Desember 2015. Pengambilan data sebanyak 669 ekor ikan kakap merah di wilayah pendaratan ikan Belitung yang termasuk dalam wilayah Laut Cina Selatan. Hasil analisis diperoleh beberapa parameter populasi ikan kakap merah (Lutjanus malabaricus) memiliki koefisien pertumbuhan (=K) sebesar 0,21 per tahun dan panjang asimtotik (=L") 86,10 cm. Laju mortalitas alami (=M) 0,49 pertahun dan mortalitas penangkapan (F) sebesar 0,59 per tahun, sehingga diperoleh nilai kematian total (=Z) 1,08 pertahun. Panjang pertama kali tertangkap (= Lc) sebesar 38,2 cmTL dan panjang pertama kali matang gonad (=Lm) 45,6 cmTL. Status tingkat pemanfaatan ikan kakap merah (=E) sebesar 0,55. Tingkat pemanfaatan ikan kakap sudah over exploited sebesar 9 persen dari kondisi optimum. KATA KUNCI: Pertumbuhan; tingkat pemanfaatan; Laut Cina SelatanABST RACT The red snapper as one of the demersal fish are prone to catching and have an influence on the balance of the ecosystem. The study was conducted in May-December 2015. Data collection of 669 red snapper fishes in the landing area of Belitung are included in the South China Sea region. The analysis obtained several population parameters of red snapper (Lutjanus malabaricus) has a coefficient of growth (= K) of 0.21 per year and asymptotic length (= L") 86.10 cm , The rate of natural mortality (= M) 0.49 arrests per year and mortality (F) of 0.59 per year, so that the value of total mortality (= Z) 1.08 per year. Length at first captured (= Lc) 38.2 cmTL and length at first maturity (= Lm) 45.6 cmTL. Status utilization rate of red snapper (= E) of 0.55. The utilization rate of snapper fish has been over exploited by 9 percent from the optimum conditions.

Population Dynamic Parameters and Length Based Spawning Potential Ratio (LB-SPR) of Red Snapper (Lutjanus malabaricus) in The Eastern Java Sea

“…These values are smaller compared to 2012 data in the eastern Java Sea of which 97.65 cmFL [9]. In other areas, the red snappers in the western South Sulawesi was 73.98 cmTL [23], while in Sinjai was 77.30 cmTL [24], and in the South China Sea was 86.10 cmTL [25]. Based on k value, red snapper showed slightly different growth ability between male and female with 0.27 compared to 0.29 per year.…”

Phylogeography pattern of Lutjanus kasmira in the Bengal Strait and the Arabian Sea

“…However, there is no shared haplotype between populations in the Strait of Bengal (Indonesia and India populations), even to populations in the Arabian Sea. Another cause is thought to be because snapper is a demersal fish living on coral reefs that have a low migration pattern [32][33][34] and spawned between June-September [35] where the current pattern at that time led from the Bengal Strait to the southern part of the Indian Ocean, while in the October-January period it led to the Arabian Sea [36]…”

Life-history traits variation of Lutjanus malabaricus (Bloch & Schneider, 1801) in the waters off Northern Vietnam

“…Regarding growth parameters, our estimation of constants of the von Bertalanffy equation is close to the ones for Australian waters and southern Indonesia (Edwards, 1985; Newman, 2002; Fry and Milton, 2009) and to waters off Pakistan (Masood and Farooq, 2011). According to the literature data, there is a general trend in the increase of growth coefficients and asymptotic length in the equatorial area (Wahyuningsih et al ., 2016; Tirtadanu and Sadhotomo, 2018; Nurulludin et al ., 2019). For example, the asymptotic length varied between 55.3 and 97.7 cm in Indonesian waters (Fry and Milton, 2009; Wahyuningsih et al ., 2016; Ernawati and Budiarti, 2019) and from 45.9 to 70.7 cm in Australian waters, depending on the sex and area of research (Edwards, 1985; Newman, 2002; Fry and Milton, 2009).…”

“…Several studies have addressed basic life-history traits, age, growth, maturation and spawning of the Malabar blood snapper across southern, central and western parts of its range (Edwards, 1985; Newman et al ., 2000, 2002; Andamari et al ., 2004; Fry et al ., 2009; Fry and Milton, 2009; Masood and Farooq, 2011; Raeisi et al ., 2011; Mazumder et al ., 2016; Ernawati and Budiarti, 2019; Nurulludin et al ., 2019; Rapi et al ., 2019, 2020; Wibisono et al ., 2019; Ben-Hasan et al ., 2021). According to these studies, the life-history parameters of L. malabaricus may vary significantly, depending on the region.…”

“…In Vietnam, L. malabaricus reaches the greatest abundance in the central coastal area (Phấn et al, 1999). According to Allen (1985), Masood and Farooq (2011) and Nurulludin et al (2019), the Malabar blood snapper, similar to other Lutjanidae, is a vital component of coastal ecosystems, regulating the abundance of fishes, cephalopods, crustaceans and other benthic invertebrates.…”