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

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

<p align="center"><strong><em>ABSTRACT</em></strong><strong><em></em></strong></p><p class="Abstractisi">Groupers 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&gt; 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.</p><p class="TubuhTulisanAll"><strong><em>Keywords:</em></strong><strong><em> </em></strong><em>coral grouper, fisheries, Karimunjawa waters, stock status</em><strong></strong></p><p class="TubuhTulisanAll" align="center"><strong>ABSTRAK</strong></p><p class="Abstrakisi">Ikan 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 <em>P. leopardus</em>, <em>P. maculatus</em>, dan <em>P. oligacanthus</em> diindikasikan mengalami kondisi tangkap lebih dengan E &gt; 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 <em>P. areolatus</em> 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.</p><strong>Kata kunci: </strong>kerapu sunu, perikanan, Perairan Karimunjawa, status stok

scholarly journals Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus in northern coastal waters of Western Central Java, Indonesia

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
SURADI WIJAYA SAPUTRA ◽  
ANHAR SOLICHIN ◽  
WIWIET TEGUH TAUFANI ◽  
SITI RUDIYANTI ◽  
NINIEK WIDYORINI
Keyword(s):  
Carapace Length ◽  
Growth Parameters ◽  
Growth Parameter ◽  
White Shrimp ◽  
Survey Method ◽  
Northern Coast ◽  
Recruitment Pattern ◽  
Central Java ◽  
Exploitation Rate ◽  
Penaeus Indicus

Abstract. Saputra SW, Solichin A, Taufani WT, Rudiyanti S, Widyorini N. 2019. Growth parameter, mortality, recruitment pattern, and exploitation rate of white shrimp Penaeus indicus on the northern coast of Central Java, Indonesia. Biodiversitas 20: 1318-1324. The aims of this study were to know the growth parameters, first lenght captured (Lc), mortality, recruitment pattern, and the exploitation rate of white shrimp (Penaeus indicus H.Milne Edwards, 1837) in the Western Coastal North Central Java Sea, Indonesia. Samples were collected from May 2016 to July 2017 using survey method and direct observations on fishing unit areas. The results showed that the relationship of the carapace length and weight is allometric. Based on the estimates of von Bertalanffy growth equation to the carapace length, the growth parameters of CL∞ and K values in male were 37 mm and 0.97, while in female were 38.5 mm and 0.85. While, the rates of total mortality (Z), natural mortality (M), and fishing mortality (F) were 3.5, 1.67, and 1.84 for males, and 5.03, 1.51, and 3.52 for females, respectively. The exploitation rate (E) of male shrimp was 0.52 and of female was 0.7 indicating that female shrimp get higher capture pressure than the males. It also showed that the rate of exploitation has to exceed the optimum sustainable yield (E>0.5). Time recruitment occurred throughout the year, with two peak seasons, i.e., in April-June and September-November. Moreover, the length of the carapace during recruitment was 15-20 mm. While the carapace length of the first caught (CL∞50) was 18.3 mm for male and 17.6 mm for female indicating that the P. indicus caught was still in the small size, as well as below the first mature gonad (CLm50 = 22-39 mm). This is because the mesh size of cod-end is 0.75 inches or about 2 cm.

scholarly journals Population dynamics and the management of the Indo-Pacific king mackerel Scomberomorus guttatus from the upper Bay of Bengal off Bangladesh coast

1970 ◽  
Vol 27 (2) ◽  
pp. 82-90 ◽  
Author(s):  
H Rashid ◽  
MG Mustafa ◽  
S Dewan
Keyword(s):  
Bay Of Bengal ◽  
Sustainable Management ◽  
Growth Parameters ◽  
Fishing Mortality ◽  
Length Frequency ◽  
Growth Constant ◽  
Recruitment Pattern ◽  
Exploitation Rate ◽  
King Mackerel ◽  
Bangladesh Coast

Growth and mortality parameters, exploitation rates, annual recruitment patterns and length-weight relationships were estimated using FiSAT program from monthly length-frequency and weight samples of Indo-Pacific king mackerel, Scomberomorus guttatus, captured mainly by drift gill nets from the upper Bay of Bengal off Bangladesh coast. The aim was to estimate growth parameters, mortality rates, exploitation rate and recruitment pattern of S. guttatus for sustainable management. The von Bertalanffy growth parameters asymptotic length L∞ (cm) and growth constant K (per year) were 73.5 and 0.6, respectively. The L∞ and Z/K estimates provided by Wetherall plot were 73.3 and 2.3 cm. The annual rate of fishing mortality (F = 0.806) was low compared to the relatively high natural mortality (M = 0.994). The exploitation rate (E = 0.45) shows that the species was not over-exploited in the region. About 77.1% of S. guttatus were recruited during May-July and 23.0% during September-October. The growth performance index (φ′) was 3.5. The total length and body weight relationship was W = 0.0101 L 2.8622 suggesting that the growth rate was negative allometric (b<3). The growth parameters derived in the current study are comparable with previous estimates available for the same species. DOI: 10.3329/bvet.v27i2.7558 Bangl. vet. 2010. Vol. 27, No. 2, 82-90

Estimating some population parameters and stock assessment of Dark Sleeper Odontobutis potamophila in the Gaosha River, Wuyuan County, Jiangxi Province, China

2017 ◽  
Author(s):  
Wu Bin Wang Haihua ◽  
Fu Huiyun Zhang Yanping
Keyword(s):  
Growth Parameters ◽  
Stock Assessment ◽  
Total Mortality ◽  
Landing Site ◽  
Jiangxi Province ◽  
Recruitment Pattern ◽  
Growth Coefficient ◽  
West Part ◽  
Exploitation Rate ◽  
Odontobutis Potamophila

A study was conducted to investigate the growth parameters, mortality and recruitment pattern of Odontobutis potamophila collected in the Gaosha river fish landing site, west part of Wuyuan County (Latitude: 29° 14' 29" N, Longitude: 117° 45' 49" E). O.potamophila were collected from November, 2013 to October, 2014. Growth parameters, asymptotic length (L) = 192mm and growth coefficient (k) = 0.22 year-1. Growth performance index(Ø’) =3.91, total mortality (Z) = 0.72 year-1, natural mortality (M) = 0.32 year-1, fishing mortality (F) = 0.40 year-1 and exploitation rate (E) = 0.55year-1.The estimated exploitation rate (E) has slightly exceeded the optimum value of E indicating this species was sustainable exploitation in the study area. The exploitation ratios were computed as Emax= 0.61, E10= 0.52, E50= 0.34. The length at first capture at 50%, (Lc) was 77 mm. The recruitment pattern of the species was found continuous all-round the year with one peak. The observation of the annual recruitment of O.potamophila found to occur from May to July. Steady biomass also increased with length class until 121-125 mm, and the total steady state biomass was found to be 2240 kg.

Estimation of Population Parameters and Stock Assessment of Mastacembelus armatus in the Taojiang River, Xinfeng County, Jiangxi Province, China

2019 ◽  
Author(s):  
Wu Bin ◽  
Wang Haihua ◽  
Ma Benhe ◽  
Xu Xiandong ◽  
Zeng Qingxiang
Keyword(s):  
Growth Parameters ◽  
Stock Assessment ◽  
Total Mortality ◽  
Landing Site ◽  
Jiangxi Province ◽  
Recruitment Pattern ◽  
Growth Coefficient ◽  
Exploitation Rate ◽  
Mastacembelus Armatus ◽  
River Fish

A study was conducted to investigate the growth parameters, mortality and recruitment pattern of Mastacembelus armatus collected in the Taojiang River fish landing site, Xinfeng County. M. armatus were collected from March, 2018 to February, 2019. Growth parameters, asymptotic length (L¥) = 58.8cm and growth coefficient (k) = 0.13 year-1. Growth performance index(Ø2 ) =2.65, total mortality (Z) = 0.75 year-1, natural mortality (M) = 0.32 year-1, fishing mortality (F) = 0.43 year-1 and exploitation rate (E) = 0.57year-1.The estimated exploitation rate (E) has slightly exceeded the optimum value of E indicating this species was over exploited mainly due to fishing in the study area. The exploitation ratios were computed as Emax= 0.59, E10= 0.45, E50= 0.31. The length at first capture at 50%, (Lc) was 19.51 cm. The Steady biomass also increased with length class until 36.0-36.9 cm and the total steady state biomass was found to be 19.12 tons.

Life history traits of the exploited limpet Patella candei (Mollusca: Patellogastropoda) of the north-eastern Atlantic

2011 ◽  
Vol 92 (6) ◽  
pp. 1379-1387 ◽  
Author(s):  
P. Henriques ◽  
R. Sousa ◽  
A.R. Pinto ◽  
J. Delgado ◽  
G. Faria ◽  
...  
Keyword(s):  
Life History ◽  
Mortality Rate ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Growth Parameters ◽  
Total Mortality ◽  
Recruitment Pattern ◽  
Length Relationship ◽  
North Eastern ◽  
Exploitation Rate

Life history traits of Patella candei were studied for the first time, including weight versus length relationship, growth, age structure, sexual maturity, recruitment pattern, mortality rates and yield and biomass-per-recruit of an exploited population in Madeira Island, north-eastern Atlantic using monthly length–frequency data from January to December 1999. The growth pattern of P. candei showed positive allometric nature of growth (b > 3, P < 0.05). The estimated growth parameters showed an asymptotic length (L∞) and growth coefficient (K) estimated at 80.81 mm and K at 0.32 year−1 with a growth performance index (φ′) calculated as 3.32 based on the collected data. This species is moderately long-lived reaching up to 9.36 years and achieving sexual maturity at 36.7 mm of shell length. The recruitment pattern was continuous, displaying a major peak event per year, occurring in January (25.12%). The estimated total mortality rate (Z) was 1.79 year−1 while natural mortality rate (M) was 0.55 year−1 and fishing mortality rate (F) was 1.24 year−1. The probability of capture shows that the length at first capture (Lc) was 42.7 mm, the exploitation rate (E) 0.693 and the maximum allowable limit of exploitation (Emax) was 0.779 for the highest yield. The exploitation rate was less than the predicted Emax values, showing that the stock of P. candei was found to be under-exploited in the investigated area; however, its slow growth and long life make it extremely vulnerable to over-exploitation.

scholarly journals Estimation of Growth and Mortality Parameters for Two Penaeid Species of Tanzanian Coastal Waters

2019 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Coastal Waters ◽  
Growth Parameters ◽  
Stock Assessment ◽  
Commercial Fishing ◽  
Recruitment Pattern ◽  
Growth Coefficient ◽  
Fenneropenaeus Indicus ◽  
Asymptotic Size ◽  
Metapenaeus Monoceros ◽  
Exploitation Rate

Assessment of the growth and mortality parameters of Fenneropenaeus indicus and Metapenaeus monoceros was conducted. Samples for the study were collected during two ship surveys conducted in February and June 2011 and from land-based surveys on two sites at Bagamoyo and Nyamisati, which was conducted between February 2011 and December 2012. Lengthbased stock assessment FiSAT II software package was used for assessment. The growth parameters which were asymptotic size (L∞), growth coefficient (K), total (Z) and natural (M) mortality, exploitation rate (E) and recruitment pattern were estimated. The results of analysis indicate that asymptotic size (L∞) for F. indicus was 44.1 mm CL for zone 1, zone 2 and Bagamoyo while Nyamisati was 48.3 mm CL. The growth coefficient (K) was 0.42, 0.83, 0.3 and 0.65 per year for zone 1, zone 2, Bagamoyo and Nyamisati respectively. The natural mortality (M) value was low in Bagamoyo and high in zone 2 while exploitation rate (E) and was high at Nyamisati area and low at Bagamoyo site. The study observed high exploitation levels on the two land-based sites (Bagamoyo and Nyamisati) despite the existing moratorium on prawn commercial fishing activities since 2008 hence seasonal closure for artisanal fishers was recommended.

scholarly journals Demographic Structure and Level of Exploitation of the Small Pelagic Pellonula leonensis Boulenger, 1916 (Pisces; Clupeidae) Fishery in the Aghien lagoon, West Africa

2018 ◽  
Vol 10 (1) ◽  
pp. 39
Author(s):  
Assi Sonan Romuald ◽  
Boussou Koffi Charles ◽  
Konan Koffi Félix ◽  
Aliko N’Guessan Gustave ◽  
Bony Kotchi Yves ◽  
...  
Keyword(s):  
Condition Factor ◽  
Growth Parameters ◽  
Fish Population ◽  
Demographic Structure ◽  
Recruitment Pattern ◽  
Growth Coefficient ◽  
Mean Values ◽  
Von Bertalanffy Model ◽  
Exploitation Rate ◽  
One Year

Demographic structure and level of exploitation of Pellonula leonensis in the Aghien lagoon were examined by applying length-weight relationship (LWR), Condition factor, Von Bertalanffy model, Mortality parameters, Exploitation rate, Recruitment pattern and Beverton and Holt analysis. Fish population were sampled monthly during one year between June 2014 and May 2015 from artisanal and experimental captures in the Aghien Lagoon. Except LWR and the condition factor, studied parameters were provided by the FiSAT II package. The negative allometric growth (b = 2.61) was reported for Pellonula leonensis. Mean values of the condition factor (CF) vary significantly from one month to another (Anova, p ˂ 0.05). Concerning growth parameters, results indicated that the asymptotic length (L∞) has been estimated at 126.84 mm SL, growth coefficient (K) was 0.67 year -1 and growth performance index (Φ') was 2.03. Growth modelization revealed 4 cohorts for Pellonula leonensis. The estimates of the total (Z), natural (M) and fishing (F) mortalities were 1.87, 0.92 and 0.95 year -1 respectively. The recruitment pattern was continuous throughout the year with two Gauss curve. The exploitation rate obtained (E = 0.51) was close to E0.1 (E0.1 = 0.55), thus indicating that the P. leonensis stock is in an optimum state of exploitation.

scholarly journals Population dynamics of Bombay duck Harpodon nehereus (Hamilton, 1822) of the Bay of Bengal along Bangladesh coast

2018 ◽  
Vol 45 (2) ◽  
pp. 101-110
Author(s):  
MN Sarker ◽  
Md Humayun ◽  
Md Atiar Rahman ◽  
Md Sharif Uddin
Keyword(s):  
Growth Parameters ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Frequency Data ◽  
Length Frequency ◽  
Recruitment Pattern ◽  
Exploitation Rate ◽  
Bombay Duck ◽  
Two Peaks ◽  
Length Frequency Data

Population parameters of Harpadon nehereus were estimated using FiSAT-II. length-frequency data collected from different landing centers along the coast of Bangladesh. The Von Bertalanffy growth parameters L∞and K for the species were 45.05 cm and 1.30/year, respectively. The annual rate of natural mortality (M) and fishing mortality (F) were found to be 1.86 and 2.58, respectively. The estimated value of the exploitation rate (E) using the lengthconverted catch curve was 0.58 and E max was found to be 0.582. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E > 0.50) condition for H. nehereus in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.003199 L3.Bangladesh J. Zool. 45(2): 101-110, 2017

scholarly journals Population Parameters Of Distichodus Rostratus (Gunther, 1864) From The Hydrosystem Located Between The Hydroelectric Dams Of Kossou And Taabo (Bandama River; Côte d’Ivoire)

2016 ◽  
Vol 12 (24) ◽  
pp. 157
Author(s):  
Berte Siaka ◽  
Kone Naminata ◽  
Ouattara Nahoua Issa ◽  
Kouamelan Essetchi Paul ◽  
N’douba Valentin
Keyword(s):  
Sustainable Management ◽  
Goodness Of Fit ◽  
Growth Parameters ◽  
Hydroelectric Dams ◽  
Fishing Mortality ◽  
Age At Maturity ◽  
Length Frequency ◽  
Growth Constant ◽  
Recruitment Pattern ◽  
Exploitation Rate

Growth and mortality parameters, exploitation rates and annual recruitment patterns were estimated using FiSAT program from monthly length-frequency and weight samples of Distichodus rostratus captured from the hydrosystem located between the hydroelectric dams of Kossou and Taabo (Bandama River). Samples were collected from July 2004 to June 2005. The aim was to estimate growth parameters, mortality rates, exploitation rate and recruitment pattern of D. rostratus for sustainable management. The von Bertalanffy growth parameters asymptotic length L∞ (cm) and growth constant K (per year) were 69.30 and 0.27 respectively. Goodness of fit (Rn) was 0.27. The growth performance index (φ’) value was 3.11. Age at maturity was estimated at 2.87 years for males and 3.78 years for females. The maximum age estimated was 11.095 years. The annual rate of fishing mortality (F = 0.10) was low compared to the relatively high natural mortality (M = 0.60). The exploitation rate (E = 0.14) shows that the species was not over-exploited in the Bandama River.

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

2019 ◽  
Vol 25 (3) ◽  
pp. 191
Author(s):  
Tirtadanu Tirtadanu ◽  
Umi Chodrijah
Keyword(s):  
Growth Parameters ◽  
Penaeus Monodon ◽  
Biological Characteristics ◽  
Nursery Ground ◽  
Population Parameters ◽  
Biometric Data ◽  
Stock Status ◽  
Tiger Prawn ◽  
Spawning Potential Ratio ◽  
Exploitation Status

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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