Growth, mortality, recruitment pattern, and exploitation rate of shared stock flying fish (Exocoetidae) at border area of Indonesia and Timor Leste in Ombai Strait

Dinamika populasi merupakan aspek penting sebagai dasar pengelolaan perikanan dan informasi tentang aspek tersebut pada lobster pasir masih minim di perairan Palabuhanratu. Tujuan penelitian ini adalah mengkaji aspek pertumbuhan, pola rekrutmen, mortalitas dan laju eksploitasi lobster pasir (Panulirus homarus) di perairan Palabuhanratu. Penelitian ini dilakukan periode Juni 2015-Mei 2016 dengan metode sensus. Lobster pasir hasil tangkapan jaring insang dasar dengan jumlah total sampel 483 ekor mempunyai panjang karapas antara 28-100 mm. Pola pertumbuhan berdasarkan hasil regresi linear memperlihatkan allometrik negatif. Hasil analisis menggunakan metode ELEFAN I (Electronic Length Frequency Analysis) menunjukan koefisien pertumbuhan lobster pasir jantan (K = 0,29 per tahun), lebih kecil dibandingkan dengan betina (K = 0,40 per tahun). Rekrutmen terindikasi dua puncak dalam setahun: yaitu pada Februari-Mei dan September-Oktober). Laju mortalitaskarena penangkapan (F) mencapai 1,9-2,2 kali laju mortalitas alami (M). Nilai Lc<Lrmemperlihatkan lobster pasir sudah tertangkap sebelum mencapaiukuran rata-rata mengerami telur atau ukuran kematangan reproduktif. Laju eksploitasi lobster pasir mencapai 32-38% di atas laju eksploitasi optimum, sehingga lobster pasir sudah mengalamieksploitasi yang berlebih.Population dynamics is an important aspect as basic of fisheries management and little information of this aspect for spiny lobster fishery in Pelabuhanratu waters. This research aims to evaluate of growth aspects, recruitment pattern, mortality, and exploitation rate of scalloped spiny lobster (Panulirus homarus) in Palabuhanratu waters. This research was conducted in June 2015 until May 2016 using census method. The size of P. homarus captured using bottom gill-net with total sample 483 specimen was between 28-100 mm carapace lengths (CL). Linear regression showed that growth pattern was negative allometric. The growth coefficient of male (K = 0.29 per year) was found smaller than female (K = 0.40 per year) based on ELEFAN I (Electronic Length Frequency Analysis) method. Recruitment seems to be accrued twice peaks a year (February to May and September to October) and the highest was at February to May. Fishing mortality (F) reached 1.9 to 2.2 times of natural mortality (M). The LcÂLr value showed that female has been caught before reached the average size of bearing eggs or reproductive maturity size. The exploitation rate of spiny lobsters reaches 32-38% above optimum level. This study suggests that the spiny lobster fishery in Palabuhanratu in the state of overexploitation.

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

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d200511 ◽

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.

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

Bangladesh Veterinarian ◽

10.3329/bvet.v27i2.7558 ◽

1970 ◽

Vol 27 (2) ◽

pp. 82-90 ◽

Cited By ~ 2

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

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PREVENTION OF ILLEGAL FUEL SMUGGLE IN THE BORDER OF EAST NUSA TENGGARA AND TIMOR LESTE

de Jure Jurnal Ilmiah Ilmu Hukum ◽

10.33387/dejure.v2i2.3132 ◽

2021 ◽

Vol 2 (2) ◽

pp. 15

Author(s):

Evelyn Bellatrix Sumby

Keyword(s):

Natural Resources ◽

Oil And Gas ◽

Task Force ◽

Gas Production ◽

Fuel Oil ◽

Border Area ◽

Small Communities ◽

Timor Leste ◽

The Government ◽

Oil And Gas Sector

Indonesia is one of the countries with abundant natural resources, this can be seen from the abundant human resources that are able to improve the management of existing natural resources. This is also emphasized in Article 33 paragraph 3 of the 1945 Constitution of the Republic of Indonesia (UUD RI 1945). A different fact is faced by small communities in the border area between Nusa Tenggara Timur Indonesia and Timor Leste. The problem is that the small communities there are not unable to enjoy subsidy relief due to wrong targets but because of smuggling carried out to neighboring countries. In several criminal cases that occurred in the border area between East Nusa Tenggara and Timor Leste, one of them was the Indonesian National Armed Forces (Satgas Pamtas) RI-RDTL East Sector Border Security Task Force, Yonif Raider 408 / Sbh, thwarted the smuggling of thousands of liters of fuel oil. (BBM) in the RI-RDTL border area.There have been many efforts made by the government to improve the welfare of its citizens by utilizing existing natural resources, especially in the oil and gas sector, one of which is in terms of access to energy consumption through fuel oil (BBM) subsidies which are still being debated. Some are of the view that state assistance must be maintained, but on the other hand, they still think that fuel subsidies are still not on target. A different fact is faced by small communities in the border area between Nusa Tenggara Timur Indonesia and Timor Leste. In addition, at the opening of the International Convention on Indonesian Upstream Oil and Gas 2020, which was organized by SKK Migas, the Government also supported the improvement of the investment climate in Indonesia's upstream oil and natural gas (oil and gas) sector, amid a decline in national oil and gas production and sluggish movement of strategic industries due to the the Covid-19 pandemic.

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

Indian Journal of Animal Research ◽

10.18805/ijar.v0iof.9139 ◽

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.

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Population dynamics of Sardinella aurita (Val., 1847) within Ghana’s coastal waters

Research in Agriculture Livestock and Fisheries ◽

10.3329/ralf.v4i3.35103 ◽

2017 ◽

Vol 4 (3) ◽

pp. 237-248

Author(s):

Samuel KK Amponsah ◽

Patrick K Ofori Danson ◽

Francis KE Nunoo ◽

Godfred A Ameyaw

Keyword(s):

Mortality Rate ◽

Coastal Waters ◽

Total Mortality ◽

Mesh Size ◽

Reference Points ◽

Recruitment Pattern ◽

Commercial Fish ◽

Management Interventions ◽

Exploitation Rate ◽

Sardinella Aurita

Following the declining stocks of Sardinella aurita within the coastal waters of Ghana, this study aimed at examining some population parameters of Sardinella aurita as a guide for managing this important stock sustainably. Length-frequency data of 717 samples were obtained from June, 2014 to January 2015 and measured for total length with the resultant data analyzed using FiSAT II. The asymptotic length (L∞) and growth rate (K) were 21.53 cm SL and 0.25yr-1 respectively. The theoretical age at birth (t0), longevity (tmax) and growth performance index (ϕ) were -0.74yr-1, 12 years and 1.849 respectively. Total mortality rate (Z), natural mortality rate (M) and fishing mortality rate (F) were 3.17, 0.76 and 2.41yr-1 respectively. The ages at first recruitment and first capture signaled future collapse of the stock, in the absence of proper management interventions. VPA outcome showed that mid- lengths of 11 cm and 12 cm SL experienced the highest harvesting rate with MSY estimated at 7733 tons. The recruitment pattern was continuous with two major recruitment pulses. Exploitation rate (Ecurr=0.76) was higher than the maximum exploitation rate (Emax=0.56), indicating unsustainable exploitation. Further, the fishing regime fell within the overfished stage based on the Quadrant Rule. For sustainable exploitation of this commercial fish species, implementation of relevant biological reference points through reduction in fishing efforts, creation of marine protected areas and mesh size regulation are urgently advocated.Res. Agric. Livest. Fish.4(3): 237-248, December 2017

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Population Parameters of Two Commercially Important Species belonging to the Family Sciaenidae Encountered in the Coast of Ghana

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2020/v6i330098 ◽

2020 ◽

pp. 21-29

Author(s):

Samuel K. K. Amponsah ◽

Selasi Yao Avornyo ◽

Kofi Ferni Anyan

Keyword(s):

Mortality Rate ◽

Fish Species ◽

Coastal Waters ◽

Total Mortality ◽

Population Parameters ◽

Recruitment Pattern ◽

Important Species ◽

The Family ◽

Exploitation Rate ◽

Commercially Important

Population parameters for two commercially important fishes of Sciaenidae from the coastal waters of Ghana were assessed using length-frequency data obtained from August 2017 to June 2019. Samples of the assessed fish species were obtained through experimental fish trawl along the coast of Greater Accra, Ghana. Trawling was performed every quarter for an average of one hour at an average speed of 3.0 km/hr. In all, a total of 399 samples were measured and the obtained data were analyzed with FiSAT II. The assessed fish species included Pteroscion peli (165 samples) and Pseudotolithus senegalensis (234 samples). The asymptotic length (L∞) was 19.4 cm and 41.5 cm forPteroscion peli and Pseudotolithus senegalensis. Pteroscion peli and Pseudotolithus senegalensis recorded growth rate (K) of 0.48 and 0.50 per year respectively. Both assessed fish species exhibited continuous recruitment pattern with minor and major recruitment peaks. The total mortality rate (Z) was 1.86 and 1.63 per year for Pteroscion peli and Pseudotolithus senegalensis. The fishing mortality rate (F) was estimated at 0.66 and 0.63 per year for Pteroscion peli and Pseudotolithus senegalensis. The natural mortality rate (M) estimated for Pteroscion peli and Pseudotolithus senegalensis was 1.20 and 1.00 per year respectively. The exploitation rate (E) of Pseudotolithus senegalensis (0.39) and Pteroscion peli (0.36) respectively was far below the maximum exploitation rate (Emax), indicating under-exploitation of its fishery in the coastal waters of Ghana, hence the need to enhance the exploitation of these species.

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Problematika Pembelajaran Sejarah Sastra di Kampus Wilayah Perbatasan Negara Kesatuan Republik Indonesia-Republik Demokratik Timor Leste

DIGLOSIA Jurnal Kajian Bahasa Sastra dan Pengajarannya ◽

10.30872/diglosia.v4i3.133 ◽

2021 ◽

Vol 4 (3) ◽

pp. 351-364

Author(s):

Uman Rejo

Keyword(s):

Border Region ◽

Study Program ◽

Border Area ◽

Learning History ◽

Language And Literature ◽

Timor Leste ◽

History Of ◽

Literature Education ◽

The Republic ◽

History Of Literature

This research aims to explore and describe some of the problems experienced in the learning History of Literature courses in Indonesian Language and Literature Education courses on the campus of the border region of the Unitary State of the Republic of Indonesia-Democratic Republic of Timor Leste (NKRI-RDTL). One of the campuses located in the border area is the University of Timor (Unimor). The problems explored will be balanced with several solutions and recommendations, to reduce some of the problems represented. In this case, the method used is a qualitative descriptive method using an e-ethical paradigm. This paradigm was used by Clifford Geertz in The Religion of Java which was presented to Abangan Santri dan Priyayi dalam Masyarakat Jawa (1981) by Aswab Mahasin. About Timorese culture, Gregor Neonbasu applied this paradigm in his monograph entitled Citra Manusia Berbudaya: Sebuah Monografi tentang Timor dalam Perspektif Melanesia (2017). The subject of this research is the study activity learning History of Literature inactive students of the first semester (odd) study program of Indonesian Language and Literature Education Faculty of Educational Sciences, University of Timor academic year 2019—2020. Based on the results of the study concluded that the problem faced in the learning History of Literature courses on the campus of the border area of NKRI-RDTL is due to five aspects, namely material aspects or teaching materials, methods, media, students, and literacy.

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Population Dynamics of Five Important Commercial Fish Species in the Sundarbans Ecosystem of Bangladesh

Journal of Applied Life Sciences International ◽

10.9734/jalsi/2019/v22i230122 ◽

2019 ◽

pp. 1-13

Author(s):

Md. Golam Mustafa ◽

Imran Ahmed ◽

Mohammod Ilyas

Keyword(s):

Population Dynamics ◽

Fish Species ◽

Total Mortality ◽

Assessment Tools ◽

Natural Mortality ◽

Lates Calcarifer ◽

Recruitment Pattern ◽

Exploitation Rate ◽

Acanthopagrus Latus ◽

The Sundarbans

Aims: To determine the population dynamics and assess the exploitation level of Mystus gulio, Acanthopagrus latus, Chelon parsia, Otolithoides pama and Lates calcarifer in the Sundarbans ecosystem of Bangladesh. Study Design: Monthly length-frequency data of five fish species were collected from the Sundarbans ecosystem. The lengths of five fish species were recorded to the nearest one cm intervals in each month. Place and Duration of Study: The study was conducted from January to December 2011 in the Sundarbans ecosystem in Bangladesh. Methodology: The FAO-ICLARM Fish Stock Assessment Tools (FiSAT II) software was used to estimate the von Bertalanffy growth parameters (L∝ and K), mortality coefficients (Z, M and F), probability of capture, recruitment pattern and Yield/Biomass-per-recruit for five commercially important fish species caught by fishers in the Sundarbans ecosystem of Bangladesh. Results: In the Sundarbans ecosystem of Bangladesh area the values of asymptotic length (L∝) for Mystus gulio, Acanthopagrus latus, Chelon parsia, Otolithoides pama and Lates calcarifer were found to be 23.0 cm, 33.6 cm, 30.0 cm, 32.5 cm and 55.0 cm respectively while the growth co-efficient (K) were 0.75, 0.85, 1.1, 0.8 and 0.5 respectively. The estimates for L∝ (23.00 – 55.0 cm) and K (0.5-1.1 year-1) obtained were consistent with those available in the literature. Relatively high K and low L∝ values, typical of short-lived tropical fishes, were obtained for Mystus gulio, Acanthopagrus latus, Chelon parsia and Otolithoides pama. The length growth performance index (ϕ’) of the Pauly and Munro’s function was in the range of 2.599 – 3.180. Natural mortality, fishing mortality and total mortality were in the range of 0.956-1.89, 0.55-1.58 and 1.52-3.3 respectively. Estimates for total mortality (Z) and natural mortality (M) imply low annual rates of survival and high turnover rates. The recruitment pattern suggested one main pulse of annual recruitment. The exploitation rate was estimated to be between 27% and 47% and the length at first capture was estimated to be approximately 19-54% of L∝. The exploitation rate obtained for five fish species are relatively lower compared to other available studies in the coastal areas of Bangladesh. The growth and exploitation rates obtained were compared with available estimates to evaluate the consistency of the results with current knowledge about the species in the region. Conclusion: The study indicated that the length-at-first-capture/L∝ seem to be a simple parameter, which could be used to make a rapid assessment of the status of the stocks. All together, the present study reveals that the population of these five studied species attains acceptable sustainability levels in the Sundarbans ecosystem and scope for a slight increase in catch efforts.

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