Distribusi spasio-temporal populasi rajungan betina yang mengerami telur (BEF) telah dikaji di perairan pesisir Lampung Timur. Penelitian dilakukan pada tiga stratifikasi kedalaman perairan: <5 m (strata S1), antara 5-10 m (strata S2), dan >10 m (strata S3) serta empat sub-area (A1-A4) di setiap stratum dari bulan Maret 2012-Februari 2013. Kelimpahan populasi rajungan BEF diindikasikan dengan proporsi rajungan BEF/betina tidak mengerami telur (NBF) dan BEF/total individu. Perbedaan proporsi dianalisis dengan uji ANOVA satu arah. Hasil penelitian menunjukan bahwa proporsi rajungan BEF bervariasi secara spasial, ditemukan mulai dari strata S1 dan meningkat ke strata S3. Daerah pemijahan dan pembiakan yang dominan terdapat pada kedalaman air >5 m dan di sub-area A2 dan A3. Secara agregat, BEF ditemukan sepanjang tahun dengan dua puncak kelimpahan (Mei dan September-Oktober) sebagai puncakmusimpemijahan dan pembiakan. Proporsi rajungan BEF secara spasio temporal tumpang tindih dengan daerah penangkapan rajungan pada hampir semua musim. Diperlukan strategi pengelolaan pemanfataan yang sesuai untukmenunjang keberhasilan reproduksi, diantaranya penangkapan menggunakan alat yang dapat mempertahankan BEF dalam keadaan hidup selama terperangkap, kemudian melepaskannya atau memeliharanya di area tertentu sampai menetaskan telurnya sehingga dapat meningkatkan produksi larva dan pada akhirnya dapat mempertahankan populasi dan stok.Spatial-temporal distribution of berried females (BEFs) Portunus pelagicus was studied in East Lampung coastal waters. An investigation was conducted at three water depth stratifications, i.e., less than 5 m (stratum S1), between 5-10 m (stratum S2) and more than 10 m (stratum S3), as well as four sub-areas (A1 A4) in each of stratifications from March 2012 to February 2013. The abundance of BEF population was indicated by their proportion to non-berried females (NBFs) and to the total individual crabs, while the differences among the results were tested by one-way ANOVA test. The results showed that the proportions of BEFs varied spatially, increased from stratum S1 to S3. Spawning and breeding seemed to dominantly occur at water depth more than 5 m and A2 and A3 sub-areas. BEFs were found throughout the year with two peaks of its occurrence, i.e. in May and in September to October, and those months were considered as peak of spawning and breeding seasons. The spatial and temporal occurrence of BEFs overlapped with crab fishing grounds in most fishing seasons. An appropriate fisheries management strategy is required for their reproduction success. Capturing crab by using eco-friendly fishing gear that render caught BEFs alive and releasing them or keeping them in certain area for hatching their eggs would enhance larvae production to maintain population and stock.
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.
The blue swimming crab (BSC), Portunus pelagicus (Linnaeus 1758), inhabits coastal areas of Southeast and East Asia, and is one of high fisheries commodities with an export value for Indonesia and an increasing global market demand, annually. However, the data of genetic diversity and their spatial connectivity of populations in Indonesia are not yet known, even when it is important to inform stock unit management and sustainable use. This study aimed to determine the genetic diversity and differentiation of blue swimming crabs across Indonesian populations in different Fishery Management Area (FMA), and their spatial genetic connectivity, as well as to deliver implications for sustainable fishery. A total of 297 individuals were collected and amplified using cytochrome oxidase I mitochondrial DNA. This study has showed the highest values for haplotype and nucleotide diversity in the eastern part of Indonesia, where exploitation is relatively low. Significant genetic differentiation between populations (FST = 0.954; p < 0.001) and the fisheries management areas (FST = 0.964; p < 0.001) were revealed. Low spatial connectivity was observed between populations in a distance of at least more than 60 kilometers. This study suggests that BSC populations in Indonesia, likely have several stock units, and preferably different fisheries management plans and actions across the region thoroughly and simultaneously. This would be effective for management and their sustainable conservation.
Lobster batu (Panulirus penicillatus) merupakan salah satu sumberdaya perikanan yang ada di Teluk Palabuhanratu. Informasi mengenai dinamika populasi lobster batu masih minim. Penelitian ini bertujuan menganalisis tingkat pemanfaatan lobster batu (Panulirus penicillatus) di Teluk Palabuhanratu, serta membandingkan ukuran saat pertama kali tertangkap (Lc50) terhadap ukuran lobster batu betina saat pertama kali mengerami telur (Lr50). Penelitian dilaksanakan pada Oktober 2016 hingga Maret 2017. Estimasi parameter populasi menggunakan FiSAT II. Pendugaan Lc50 dan Lr50 menggunakan metode kurva logistik. Lobster yang tertangkap memiliki ukuran 40–102 mm panjang karapas, serta umur maksimum jantan dan betina yaitu 8,0 dan 7,0 tahun. Puncak rekrutmen terjadi pada Agustus hingga September. Laju eksploitasi lebih dari 0,50. Lobster jantan dan betina memiliki Lc50 62,5 mm dan 61,0 mm. Nilai Lr50 betina adalah 65,3 mm. Sumberdaya lobster batu di Teluk Palabuhanratu terindikasi sudah mulai tangkap lebih, dan lobster batu betina sudah tertangkap sebelum mencapai ukuran rata-rata mengerami telur.
Kembaren DD, Zairion, Kamal MM, Wardiatno Y. 2018. Abundance and spatial distribution of blue swimming crab (Portunuspelagicus) larvae during east monsoon in the East Lampung waters, Indonesia. Biodiversitas 19: 1326-1333. The blue swimmingcrab/BSC, Portunus pelagicus, is an economically important species in fishery industry and continuously being exploited, particularly inthe East Lampung waters. BSC research in Indonesia during the last decade was only restricted to the adult phase, while research ontheir larval dynamics in nature has not been done yet. This study aimed to assess the abundance and the distribution of BSC larvae, andto describe their correlation to its environmental conditions. This study was conducted in June 2017 (during east monsoon) in the EastLampung waters. Sampling was done in surface water during the daylight hours on nine sites with three replicates on each site. Planktonabundance and oceanographic profile were also recorded from the same sampling site. The result from this study showed that the waterquality from the environment was suitable for the development of BSC larvae. The abundance of the early-stage larvae (Z1-Z3) wasrelatively higher than the late-stage larvae (Z4 and M). The larval stages of BSC were dispersed and completed their development in themid-shore and offshore waters. There was a tendency that the early-stage was more abundant in the northern part, while the late-stagewas more abundant in the southern part of the study area. The highest larval abundance was found in the mid-shore, particularly in sitenumber five, which was influenced by the water mass density and current direction during the east monsoon. Moreover, oxygenconcentration and salinity of the water environment influenced the early-stage larvae abundance more than the late-stages abundance.
Pesisir timur Lampung merupakan salah satu daerah penghasil rajungan di Indonesia. Jumlah hasil tangkapan yang rendah menghasilkan keuntungan yang rendah pada setiap upaya penangkapan. Tujuan dari penelitian ini adalah untuk menganalisis nilai aktivitas perikanan rajungan dalam bentuk trip optimal dan keuntungan untuk pengelolaan perikanan rajungan di pesisir timur Lampung. Pengumpulan data dilakukan dengan menggunakan metode purposive sampling. Karakteristik aktivitas penangkapan rajungan didapatkan jumlah kapal (40-250 unit) dan jumlah hari melaut (16-27 trip/bulan) pada setiap lokasi. Nilai produksi pada musim puncak di pendaratan rajungan Way Seputih dan Sungai Burung lebih tinggi dibandingkan 3 lokasi lainnya. Jumlah alokasi spasial tertinggi pada musim puncak di S1 adalah di Sungai Burung dengan jumlah 1974 trip/musim dan di strata 2 tertinggi di Kuala Penet dengan jumlah 2763 trip/musim. Musim sedang di S1 dan S2 tertinggi di Way Seputih 3540 trip/musim, dan Labuhan Maringgai 2883 trip/musim. Musim paceklik S1 dan S2 Sungai Burung 10088 trip/musim dan Kuala Penet 4708 trip/musim. Penetapan alokasi upaya penangkapan (trip/musim) dapat dijadikan acuan pembatasan upaya penangkapan rajungan pada setiap stratifikasi di 5 lokasi pendaratan rajungan.The eastern coast of Lampung is one of the blue swimming crabs (Portunus pelagicus) wild catch producing areas in Indonesia. Low catch weight causes a small profit to be gained on each fishing effort. Spatial allocation in fisheries seen from the location or distance and costs of activities. The purpose of this study was to analyze the value of BSC fishing activities in the form of optimal trips and benefits for the management of BSC fisheries on the east coast of Lampung. Data collection is done using purposive sampling method. Characteristics of BSC fishing activities obtained the number of ships (40-250 units) and number of days of fishing (16-27 trip/month) at each location. The production value in the peak season at the Way Seputih and Sungai Burung landings had a higher number compared to the catch per-trip in 3 other locations. The highest spatial allocation value in the peak season at S1 in the Sungai Burung with 1974 trips/season and the highest 2 in Kuala Penet with 2763 trips/season. The highest season in S1 and S2 is highest in Way Seputih 3540 trips/season, and Labuhan Maringgai is 2883 trips/season. Famine season in S1 and S2 is highest in Sungai Burung as many 10088 trips/season and Kuala Penet 4708 trips/season. Determination of alocation for fishing effort (trip/season) can be used as a reference for limiting the effort to catch of BSC in each stratification in 5 crab landing sites.
Information on habitat preferences of the blue swimming crab (BSC) juvenile and its spatial distribution is one of the factors behind the successfulness of its sustainable management. This information is needed to provide input for management strategy by considering juvenile crabs and their habitat as important aspect. The purpose of this study is to elucidate habitat preferences, abundance and biomass distribution of BSC juvenile in the east Lampung coastal waters. The research was conducted in September-October 2018, which was located in east Lampung coastal waters, Province Lampung. Spatial distribution through estimation of abundance and biomass of BSC juvenile were relatively high and concentrated in the Gambas and Wako regions at stratification of 2-4 miles from the coastline. The BSC juvenile does not appear to have a high preference to the Kuala Penet coastal habitat condition; it is considered because of low value of abundance, biomass, and Habitat suitability index (HSI). The value of HSI in the Kuala Penet Coastal region is also lower than other locations due to abiotic and biotic factors for supporting the crabs at juvenile stage.
Exploitation rate of the blue swimming crab (BSC) in Indonesian Fisheries Management Area (FMA) 712 is over-optimum level in 2016. Stocks concern in sustainable management is needed as an effort to maintain its availability. The objective of this study is to identify the stock unit of BSC based on Truss Network Analysis (TNA) of morphometric characters in FMA 712. The BSC was collect in five different locations, i.e. East Lampung, Lancang Island, Cirebon, Rembang, and Southern Madura. Measurements on TNA were carried out at 14 landmark points with 29 characters in carapace to analyze its morphometric characters. The cluster analysis showed that TNA method revealed two stocks units of BSC in FMA 712. The first stock was the BSC population of Southern Madura, and the other stock was the other four population. The longest Euclidean distance was found at Southern Madura indicating similarity level with other populations was low. The discriminant analysis demonstrated the different result. There were three group populations, which every population in one group were able to represent the other population, namely Lancang Island-Cirebon, East Lampung-Rembang, and Southern Madura. Regarding to this study, it is recommended to manage BSC in Southern Madura separately.
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