BIOLOGICAL CHARACTERISTICS, POPULATION PARAMETERS, EXPLOITATION STATUS AND SPAWNING POTENTIAL RATIO  OF GIANT TIGER PRAWN (PENAEUS MONODON FABRICIUS, 1798)  IN SEBATIK WATERS, KALIMANTAN UTARA

The limited data and the unreported information about the yields of giant tiger prawn (Penaeus monodon Fabricius, 1798) in Sebatik caused difficulties in estimating potention and stock status of tiger prawn. The study that could be applied for estimating stock status and management strategy for sustainable shrimp fisheries in Sebatik Waters was the study about biological characteristics, population parameters and spawning potential ratio. Samples were obtained from the catch of trammel net by fishers in some landing areas in Tanjung Aru and the biometric data has been collected during April-December 2018. The growth parameters were obtained from the movement of the monthly mode of carapace length that were based on the Von Bertalanffy growth model. Exploitation status was obtained from exploitation rate of E and length based SPR. The results showed that the mean size of shrimps that was captured by trammel net was 46,9±0,14 mmCL for male and 53,4±0,25 mmCL for female. Most of shrimps were caught before they spawn (Lc=51,2 mmCL<Lm=55,8 mmCL) and tiger prawns spawn throughout the year that the peaks occurred in Agustus dan November-December. Female shrimp has larger size (L∞ jantan=66,25 mmCL; L∞ betina=84,5 mmCL) and faster growth rate( K male=1,27 year-1; K female=1,39 year-1) than the male. The natural mortality of male shrimp was the same as the female (M=1,7 tahun-1) while the fishing mortality of male was higher than female (F male=2,13 tahun-1; F female=1,7 tahun-1). Exploitation status of tiger prawn in Sebatik Waters was fully exploited (E=0,5-0,55) and the shrimp stock has not been on growth overfishing yet according to spawning potential ratio of 34%. The shrimps fishing in Sebatik Waters could continue by avoiding the fishing on the nursery ground.

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DINAMIKA POPULASI DAN STATUS PEMANFAATAN UDANG TIGER (Penaeus monodon Fabricius 1798) DI PERAIRAN TARAKAN, KALIMANTAN UTARA

BAWAL Widya Riset Perikanan Tangkap ◽

10.15578/bawal.12.1.2020.11-17 ◽

2020 ◽

Vol 12 (1) ◽

pp. 11

Author(s):

Umi Chodrijah ◽

Ria Faizah ◽

Tirta Danu

Keyword(s):

Growth Parameters ◽

Penaeus Monodon ◽

Total Mortality ◽

Optimal Level ◽

Survey Method ◽

Von Bertalanffy ◽

Population Parameters ◽

Exploitation Rate ◽

Tiger Prawn ◽

Exploitation Status

Udang tiger (Penaeus monodon Fabricius 1798) di Tarakan merupakan salah satu komoditas ekspor dan sudah dimanfaatkan cukup lama serta memiliki permintaan dan nilai ekonomis yang tinggi. Penelitian dinamika populasi dan status pemanfaatan udang tiger di perairan Tarakan dan sekitarnya dilakukan untuk mengevaluasi status stok sumberdaya udang agar pengelolaannya dapat berkelanjutan. Penelitian ini dilakukan pada bulan Januari-November 2016 dengan metode survey. Status pemanfaatan diduga berdasarkan laju eksploitasi dan estimasi rasio pemijahan berbasis data panjang (LB-SPR). Hasil pengamatan menunjukkan udang tiger memiliki panjang karapas asimptotik (CL∞) sebesar 65,45 mm, laju pertumbuhan (K) sebesar 1,55 /tahun dan nilai t0 sebesar -0,20/tahun sehingga diperoleh persamaan pertumbuhan Von Bertalanffy CLt = 65,45(1 – e-1,55(t+-0,20)). Laju mortalitas total (Z) sebesar 6,56/ tahun, mortalitas alami (M) sebesar 1,95/tahun, mortalitas penangkapan (F) sebesar 4,62/tahun dan tingkat pemanfaatan (E) sebesar 0,70 /tahun. Tingkat pemanfaatan udang tiger di perairan Tarakan lebih besar dari tingkat pemanfaatan optimal sehingga disarankan untuk menurunkan upaya sebesar 40% dari upaya saat ini.Tiger prawn (Penaeus monodon Fabricius 1798) was one of the export commodity and had been exploited for longtime ago so it was necessary to study about its population parameters and exploitation status for its sustainable management. This research aimed to study about the population parameters and exploitation status of tiger prawn. The research were carried out from January to November 2016 using survey method and the enumeration programme. The growth parameters were based on the Modal Progression Analysis. Exploitation status was estimated based on length based spawning potential ratio (LB-SPR). The results showed that the asymptotic length (CL∞) was 65.45 mm, the growth rate (K) was 1.55 /year and = t0 was -0,20/year so Von Bertalanffy Growth Model was CLt = 65.45(1 - e -1.55(t+-0.20)). Total mortality (Z) was 6.56/years, natural mortality was 1.95/years and fishing mortality was 4.62/years and the highest recruitment of tiger prawns occured in May. The exploitation rate (E) was 0,70/years. The exploitation rate now is higher then the optimal level so it is recommended to reduce 40% of the current efforts.

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PARAMETER POPULASI KERAPU SUNU (Plectropomus sp.) DAN OPSI PENGELOLAANNYA DI PERAIRAN KARIMUNJAWA

Marine Fisheries Journal of Marine Fisheries Technology and Management ◽

10.29244/jmf.9.2.119-131 ◽

2018 ◽

Vol 9 (2) ◽

pp. 119

Author(s):

Siska Agustina ◽

Moh Natsir ◽

Menofatria Boer ◽

. Purwanto ◽

Irfan Yulianto

Keyword(s):

Sampling Method ◽

Pattern Analysis ◽

Growth Parameters ◽

Economic Value ◽

Recruitment Pattern ◽

Stock Status ◽

Fisheries Resources ◽

Exploitation Rate ◽

Spawning Potential Ratio ◽

Observation Method

ABSTRACTGroupers are important fisheries resources in the tropic and sub-tropic due to it has high economic value, so that continuously exploitation even in some waters have collapsed and high capture pressureThe study aimed to identify population parameters of coral grouper (Plectropomus sp.) in Karimunjawa waters as basic information for fisheries management. Sampling method using fish landing observation method for fish catches in 14 days every month since 2010-2015 caught in Karimunjawa waters. Growth parameters, mortality, length at first capture, and recruitment pattern analysis using the Rstudio, FiSAT II and spawning potential ratio with LB-SPR analysis. The growth rate is relatively slow with k values ranging from 0.10 to 0.13 and lifespan of 21.93-27.73 years. The stock condition of the coral grouper species of P. leopardus, P. maculatus, and P. Oligacanthus was indicated overfished with E> 0.5 and SPR of 0.14, 0.22, and 0.25. These indicate that the 3 species of Plectropomus sp. in Karimunjawa is at unsustainable levels. Coral grouper type P. areolatus has E=0.45 and SPR=0.52, meaning that this type of grouper has a low exploitation rate and high spawning potential compared to other species coral grouper in Karimunjawa waters.Keywords: coral grouper, fisheries, Karimunjawa waters, stock statusABSTRAKIkan kerapu adalah sumber perikanan penting di daerah tropis dan sub-tropis karena bernilai ekonomis tinggi, sehingga terus dilakukan eksploitasi bahkan beberapa perairan telah mengalami collapse dan tekanan penangkapan yang tinggi. Penelitian ini bertujuan mengidentifikasi parameter-parameter populasi ikan kerapu sunu (Plectropomus sp.) di perairan Karimunjawa sebagai informasi dasar dalam pengelolaan perikanan. Metode pengambilan data menggunakan metode observasi (pengamatan) terhadap hasil tangkapan ikan selama 14 hari dalam satu bulan dari tahun 2010-2015 yang ditangkap di Perairan Karimunjawa. Analisis parameter pertumbuhan, mortalitas, length first capture, dan recruitment pattern menggunakan program Rstudio, FiSAT II dan rasio potensi pemijahan dengan analisis LB-SPR. Laju pertumbuhan tergolong lambat dengan nilai k berkisar 0,10-0,13 dan lifespan 21,93-27,73 tahun. Kondisi stok ikan kerapu sunu jenis P. leopardus, P. maculatus, dan P. oligacanthus diindikasikan mengalami kondisi tangkap lebih dengan E > 0,5 dan SPR sebesar 0,14, 0,22, dan 0,25. Hal ini menunjukkan bahwa penangkapan saat ini untuk 3 spesies kerapu sunu di Karimunjawa berada pada tingkat yang tidak berkelanjutan. Kerapu sunu jenis P. areolatus memiliki E sebesar 0,45 dan SPR 0,52, artinya kerapu jenis ini memiliki tingkat eksploitasi yang rendah dan potensi pemijahan yang tinggi dibandingkan jenis kerapu sunu lainnya di Perairan Karimunjawa.Kata kunci: kerapu sunu, perikanan, Perairan Karimunjawa, status stok

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Biometric indices and population parameters of three polynemid fishes from Batang Lassa Estuary of East Malaysia

PeerJ ◽

10.7717/peerj.12183 ◽

2021 ◽

Vol 9 ◽

pp. e12183

Author(s):

M. Golam Mustafa ◽

Amy Halimah Rajaee ◽

Hadi Hamli ◽

Khairul Adha A. Rahim

Keyword(s):

Body Shape ◽

Growth Parameters ◽

River Estuary ◽

Mesh Size ◽

Thin Body ◽

Nursery Ground ◽

East Malaysia ◽

Fish Samples ◽

Exploitation Status ◽

Biometric Indices

The length-weight relationships (LWRs), condition factor (Kn), growth, mortality and exploitation status of three polynemid fishes, i.e., Filimanus xanthonema (Valenciennes, 1831), Polynemus melanochir (Valenciennes, 1831) and Polynemus paradiseus (Linnaeus, 1758) from Batang Lassa River estuary were estimated. Fish samples were caught during April 2019 to September 2020 using the ESBN (locally called Gnian) having 1.25 to 4.00 cm mesh size. The total length (TL) and body weight of each individual fish was measured to the nearest 0.1 cm and 0.01 g respectively. The growth coefficients (b) for F. xanthonema, P. melanochir and P. paradiseus, were 2.880, 2.717 and 2.724 with the R2 values 0.956, 0.972 and 0.936 respectively. Estimated growth coefficients indicated a negative allometric growth pattern for all three threadfin fishes. To date, information regarding length-weight relationships for F. xanthonema and P. melanochir is insufficient whereas the information is available for P. paradiseus. About 40–48% of fishes exhibited flat or thin body shape (Kn < 1), 48–50% were rounded or fat (Kn > 1) and only 1–3% of fishes showed proportional body shape (Kn = 1). The growth parameters L∞, K and ϕ’ were estimated at 15.75 cm, 0.95 yr−1 and 2.37 for F. xanthonema; 27.61 cm 0.87 yr−1 and 2.82 for P. melanochir; and 27.30 cm, 0.58 yr−1 and 2.64 for P. paradiseus; respectively. The estimated natural mortality (M) included 2.10, 1.69 and 1.30 yr−1; the fishing mortality (F) 0.57, 0.67 and 0.60 yr−1; and exploitation ratio (E) 0.21, 0.28 and 0.31 for F. xanthonema, P. melanochir and P. paradiseus respectively. The study concluded that the stocks are still under exploitation (E < 0.5) condition. However, the studied Batang Lassa estuary could be a potential nursery ground considering the minimum lengths of 5.0, 3.8 and 4.0 cm for F. xanthonema, P. melanochir and P. paradiseus respectively. Therefore, management initiatives are needed to escape juvenile catches.

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