Comparative fishing trials for invasive swimming crabs Charybdis japonica and Portunus pelagicus using collapsible pots

2006 ◽  
Vol 82 (1-3) ◽  
pp. 50-55 ◽  
Author(s):  
Miguel Vazquez Archdale ◽  
Cherry Pilapil Añasco ◽  
Shinji Hiromori
Keyword(s):  
Portunus Pelagicus ◽  
Charybdis Japonica ◽  
Swimming Crabs

Effect of two collapsible pot designs on escape rate and behavior of the invasive swimming crabs Charybdis japonica and Portunus pelagicus

2007 ◽  
Vol 85 (1-2) ◽  
pp. 202-209 ◽  
Author(s):  
Miguel Vazquez Archdale ◽  
Cherry Pilapil Añasco ◽  
Yousuke Kawamura ◽  
Sanae Tomiki
Keyword(s):  
Escape Rate ◽  
Portunus Pelagicus ◽  
Charybdis Japonica ◽  
And Behavior ◽  
Swimming Crabs

scholarly journals VARIABILITY OF CARAPACE WIDTH SIZE AND ABUNDANCE OF BLUE SWIMMING CRABS (Portunus pelagicus Linnaeus) IN PATI WATERS

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Dyah Ika Nugraheni ◽  
Achmad Fahrudin ◽  
. Yonvitner
Keyword(s):  
Coastal Waters ◽  
Accretion Rate ◽  
Carapace Width ◽  
Management Strategies ◽  
Fishing Effort ◽  
Swimming Crab ◽  
Nearshore Zone ◽  
Portunus Pelagicus ◽  
Males And Females ◽  
Swimming Crabs

<p><em>Fishing effort enhancement would put pressure on blue swimming crab resources and its ecosystem. The objective of this study was to determine the spatial distribution based on the size of the carapace width (CW), abundance, temperature, salinity, depth, and fishing intensity in Pati waters which was divided into two zones (zones 1=nearshore, zone 2=offshore). The result showed that the average of carapace width in zone 1 to zone 2 was significantly different (p &lt;0.05), as well as between males and females. Average number of individual (abundance) was significantly different according to fishing areas and sex (p &lt;0.05). The average of water temperature in zone 1 was higher than in zone 2, salinity in zone 1 was smaller than in zone 2, and the water depth in zone 1 was shallower than in zone 2. The higher the crab catch intensity leaded to the smaller the abundance and size of carapace width. Alternative management strategies were proposed such as to divert fishing grounds from coastal waters to offshore during low productivity season, to uphold rules on minimum legal size for catching (Lm = 107 mm),  to release of berried females catch, and to reduce accretion rate of gear and fishing fleet mainly in the coastal zone waters.</em></p><p><em><strong><em>Keywords:  </em></strong><em>blue swimming crab, carapace widht (CW), abundance, intensity of fishing</em></em></p>

scholarly journals Kajian Tingkat Kerentanan Rajungan (Portunus pelagicus) di Perairan Desa Tunggulsari Kabupaten Rembang

2021 ◽  
Vol 10 (1) ◽  
pp. 147-157
Author(s):  
Parameswari Iccha Nirmalabuddhi Wishnuputri ◽  
Sri Redjeki ◽  
Retno Hartati
Keyword(s):  
Water Quality ◽  
Growth Pattern ◽  
Economic Value ◽  
Quality Parameters ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Male And Female ◽  
Over Exploitation ◽  
The Village ◽  
Swimming Crabs

Rajungan (Portunus pelagicus) adalah salah satu sumber daya hayati laut Indonesia. Rajungan merupakan komoditas utama  perikanan di Indonesa, baik untuk lokal maupun ekspor. Nilai ekonomis rajungan yang tergolong tinggi mengakibatkan penangkapan rajungan dilakukan secara besar-besar dan dapat memicu terjadinya kepunahan. Penelitian bertujuan untuk mengetahui tingkat kerentanan rajungan di Perairan Desa Tunggulsari dan mengetahui karakteristik morfometri dari rajungan yang ditangkap pada lokasi tersebut. Metode yang digunakan dalam penelitian ini adalah metode Productivity and Susceptibility Analysis (PSA). Wawancara dilakukan kepada 60 nelayan di Desa Tunggulsari. Pengukuran parameter kualitas perairan meliputi suhu, oksigen terlarut, salinitas, dan pH. Pengukuran morfometri dilakukan pada salah satu pengepul di desa. Hasil dari wawancara diketahui bahwa nelayan di Desa Tunggulsari menggunakan 2 macam alat tangkap yaitu bubu lipat dan jaring insang dasar. Penilaian atribut produktivitas rajungan masuk dalam kategori tinggi, sedangkan penilaian atribut kerentanan tergolong pada resiko rendah untuk penggunaan kedua alat tersebut. Nilai MSC untuk alat tangkap bubu lipat adalah 96,0 dan 98,2 untuk alat tangkap jaring insang dasar. Nilai MSC > 80 menunjukkan bahwa tingkat kerentanan rajungan pada lokasi tersebut masuk pada kategori rendah. Selanjutnya, pola pertumbuhan rajungan di Desa Tunggulsari adalah allometrik negatif baik untuk rajungan jantan maupun betina. Hal ini menunjukkan pertumbuhan panjang dan lebar karapas lebih cepat dibandingkan penambahan berat rajungan. The blue swimming crab (Portunus pelagicus) is one of the Indonesian marine biological resources. The blue swimming crab is a main commodity of fisheries in Indonesia, both for local and export. Economic value of blue swimming crab classified as high involve over-exploitation of blue swimming crab and can lead to extinction. This research is aimed to determine level of vulnerability of blue swimming crab in Tunggulsari waters and to discover morphometry characteristic of blue swimming crab that caught at that location. The method used in this research is Productivity and Susceptibility (PSA) method. Interviews were conducted with 6 fishermen in the village of Tunggulsari. Measurement of water quality parameters including temperature, dissolved oxygen, salinity, and pH. Morphometry measurement was carried out in one of the collectors in the village. The results of the interview revealed that fishermen in the village of Tunggulsari used 2 fishing tools namely bubu lipat and bottom set gillnet. Assessment of blue swimming crab productivity attributes is included in the high category, while the assessment of vulnerability attributes is classified as low risk for the use of both tools. The MSC value for bubu lipat is 96,0 and 98,2 for bottom set gillnet. The MSC value is more than 80 indicates that the level of blue swimming crab vulnerability at that location is in the low category. Further, blue swimming crab growth pattern in the village of Tunggulsari are negative allometrics for both male and female blue swimming crabs. This shows the growth in length and width carapace is faster than the addition of blue swimming crab weight.

scholarly journals Survival and metamorphosis rate of swimming crab Portunus pelagicus larvae with the use of phytoecdysteroid in the artificial feed

2017 ◽  
Vol 16 (2) ◽  
pp. 261 ◽  
Author(s):  
Andi Nikhlani ◽  
Komsanah Sukarti
Keyword(s):  
Survival Rate ◽  
Analysis Of Variance ◽  
Swimming Crab ◽  
Larval Metamorphosis ◽  
Portunus Pelagicus ◽  
Crab Larvae ◽  
Swimming Crabs

<p class="NoParagraphStyle"><strong>ABSTRACT</strong></p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle">The survival rate of blue swimming crabs and the larval metamorphosis processes are still low in hatcheries. The objective of this study was to evaluate the effects of different phytoecdysteroids doses on both the survival and the rate of Blue swimmer crab larvae metamorphosis. The study consisted of four different phytoecdysteroids treatments, namely: control (0 mg/100 g of feed), 1 mg/100 g of feed, 2 mg/100 g of feed, and 4 mg/100 g of feed. Each treatment was replicated three times. The survival rate of the larvae was analyzed through analysis of variance, while the rate of larval metamorphosis was descriptively analyzed. The results showed that the dose of phytoecdysteroid of 2 mg/100 g of artificial feed resulted in the highest survival and the fastest metamorphosis speed of crab larvae for zoea-2 and zoea-3, and the dose of 4 mg/100 g of artificial feed for stadia megalopa and crablet.</p><p class="NoParagraphStyle"> </p><p class="NoParagraphStyle">Keywords: phytoecdysteroids, survival rate, metamorphosis, blue swimming crab</p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle"><strong>ABSTRAK</strong><strong></strong></p><p class="NoParagraphStyle"><strong> </strong></p><p class="NoParagraphStyle">Kelangsungan hidup rajungan dalam pembenihan masih rendah, dan proses metamorfosis larva masih lambat. Tujuan penelitian ini adalah untuk mengevaluasi pengaruh pemberian fitoekdisteroid dosis berbeda terhadap kelangsungan hidup dan kecepatan metamorfosis larva rajungan. Penelitian ini terdiri atas empat perlakuan dosis fitoekdisteroid yang berbeda, yaitu: kontrol (0 mg/100 g pakan), 1 mg/100 g pakan, 2 mg/100 g pakan, dan 4 mg/100 g pakan dengan masing-masing perlakuan dilakukan tiga kali ulangan. Kelangsungan hidup larva dianalisis menggunakan analisis sidik ragam, sedangkan kecepatan metamorfosis larva dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa dosis fitoekdisteroid sebanyak 2 mg/100 g pakan buatan menghasilkan kelangsungan hidup tertinggi dan proses metamorfosis larva rajungan tercepat untuk stadia zoea-2 dan zoea-3, serta  dosis 4 mg/100 g pakan buatan untuk stadia megalopa dan crablet.</p><p class="NoParagraphStyle"> </p><p>Kata kunci: fitoekdisteroid, kelangsungan hidup, metamorfosis, rajungan</p>

scholarly journals Growing Pattern of Blue Swimming Crab, Portunus pelagicus at Two Different Locations in Manado Bay

2018 ◽  
Vol 6 (1) ◽  
pp. 149
Author(s):  
Frank Rijkaard Makahinda ◽  
Rose O.S.E Mantiri ◽  
Boyke H. Toloh
Keyword(s):  
Growth Pattern ◽  
Carapace Width ◽  
Market Demand ◽  
Swimming Crab ◽  
Chi Square ◽  
Portunus Pelagicus ◽  
Relationship Analysis ◽  
Weight Relationship ◽  
Relationship Of ◽  
Swimming Crabs

Portunus pelagicus (blue swimming crab) is one of the important economical marine commodities produced from Indonesian coastal waters that has increasing market demand among fishery commodities. The purpose of this research is to reveal the relationship of carapace width and weight, the growth pattern and the carapace width-weight ratio of P. pelagicus crabs at two different research sites in Manado Bay. The benefits of this study, can be a reference for further studies on blue swimming crabs, P. pelagicus, and information obtained in this study could become important information needed for the maximum sustainable utilization of blue swimming crab, P. pelagicus.This research was conducted at two locations, namely Kelurahan Bahu, Sub-district of Malalayang with coordinates of 1 ° 27'49.86 "North and 124 ° 49'35.79" East and second location in Tumumpa Dua, Sub-district of Tuminting with coordinates 1 ° 31'14.51"North - 124 ° 50'28.67"East. Samples of blue swimming crabs were collected by deploying traps which are placed at 5-7 meters with the distance between traps 10 meter. Traps were placed at 17.00 pm and lifted on the next day at 06.00 am. Measurement of the width of the carapace conducted by using the ruler with 0.1 cm accuracy and weight measurement using the scales with 0.1 gram accuracy.The correlation value obtained for the wide and weight relationship of blue swimming crabs in the Sub-district of Malalayang is 0.953 for males and 0.898 for females. In Kelurahan Tumumpa Dua, Sub-dis ittrict of Tuminting 0.829 for males and 0.920 for females respectively. Based on these values the increase in the width of the carapace will affect the weight gain of the crab. The growth pattern of P. pelagicus crab in Kelurahan Bahu, Sub-district of Malalayang and Tumumpa Dua Sub-district Tuminting showed negative allometric growth pattern with b <3 value which means faster carapace growth compared to the weight of crab. From the result of chi square test on wide body and weight relationship analysis, is found same for both locations with value x2 table = 7.815 <x2 count = 112.3134. This is presumably due to one of the external factors is the availability of food.Keywords: Rajungan, growth pattern, Manado Bay AbstrakPortunus pelagicus merupakan salah satu komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Indonesia dengan permintaan pasar terhadap komoditas rajungan yang terus meningkat. Adapun tujuan penelitian ini yaitu mengetahui hubungan lebar berat rajungan P. pelagicus, pola pertumbuhan rajungan P. pelagicus dan perbandingan lebar berat rajungan P. pelagicus di dua lokasi penelitian yang berbeda di Teluk Manado. Manfaat penelitian ini, dapat menjadi bahan acuan untuk studi lebih lanjut mengenai rajungan P. pelagicus serta infomasi yang didapat dalam penelitian ini bisa menjadi bahan kajian untuk pemanfaatan rajungan P. pelagicus secara maksimal serta berkelanjutan.Penelitian ini dilaksanakan pada dua lokasi yakni di Kelurahan Bahu Kecamatan Malalayang dengan koordinat 1°27'49.86"LU - 124°49'35.79"BT dan lokasi kedua di Kelurahan Tumumpa Dua Kecamatan Tuminting dengan koordinat 1°31'14.51"LU - 124°50'28.67"BT. Pengambilan sampel dilakukan dengan alat tangkap bubu yang diletakan pada kedalam 5-7 meter dengan jarak antara bubu 10 meter. Bubu diletakan pada pukul 17.00 wita dan diangkat pada esok harinya pukul 06.00 wita. Pengukuran lebar karapas menggunakan mistar dengan ketelitian 0,1 cm dan pengukuran berat tubuh menggunakan timbangan 0,1 gr.Nilai korelasi yang didapat untuk hubungan lebar berat rajungan P. pelagicus di Kelurahan Bahu Kecamatan Malalayang 0,953 untuk jantan dan 0,898 untuk betina. Di Kelurahan Tumumpa Dua Kecamatan Tuminting 0,829 untuk jantan dan 0,920 untuk betina. Berdasarkan nilai tersebut pertambahan lebar karapas akan berpengaruh pada kenaikan berat tubuh dari rajungan. Pola pertumbuhan rajungan P. pelagicus di Kelurahan Bahu Kecamatan Malalayang dan di Kelurahan Tumumpa Dua Kecamatan Tuminting menunjukan pola pertumbuhan yang bersifat allometrik negatif dengan nilai b < 3 yang berarti pertumbuhan karapas lebih cepat dibandingkan pertambahan berat rajungan. Dari hasil analisis chi square lebar berat tubuh, sama untuk kedua lokasi penelitian dengan nilai x2 tabel =  7,815 < x2 hitung = 112,3134. Hal ini diduga karena salah satu faktor eksternal yakni  ketersediaan makanan.Kata  kunci : Rajungan,  Pola pertumbuhan, Teluk Manado.

scholarly journals Monsoon cycle influences on catch and size of blue swimming crabs (Portunus pelagicus) from crab gillnets in Phetchaburi Province

ScienceAsia ◽  
2021 ◽  
Vol 47 (4) ◽  
pp. 496
Author(s):  
Supatcha Lurkpranee ◽  
Krerkkrai Songin ◽  
Sansanee Wangvoralak ◽  
Urairathr Nedtharnn ◽  
Monissa Srisomwong ◽  
...  
Keyword(s):  
Portunus Pelagicus ◽  
Swimming Crabs

scholarly journals KESESUAIAN DAERAH PENANGKAPAN RAJUNGAN (Portunus pelagicus) MENGGUNAKAN ANALISIS SPASIAL PARAMETER LINGKUNGAN DAN HASIL TANGKAPAN DI PULAU LANCANG

2019 ◽  
Vol 10 (2) ◽  
pp. 165-176
Author(s):  
Insaniah Rahimah ◽  
Vincentius Siregar ◽  
Syamsul Agus
Keyword(s):  
Sex Ratio ◽  
Geospatial Analysis ◽  
Fishing Ground ◽  
Physical Parameters ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Species Preservation ◽  
Phosphate Nitrate ◽  
Substrate Types ◽  
Swimming Crabs

The blue swimming crab in the waters of Lancang Island is indicated as being overfished. Hence, the major challenge is managing its utilization in a proper manner. The purpose of this study is to explore the water's characteristics which is suitable for blue swimming crab fishing. Accordingly, the potential fishing ground around Lancang Island waters can be mapped spatially as an initial effort for species preservation. Geospatial analysis was applied to assess the physical parameters of the existing habitat. The results show that parameters such as MPT, TDS, brightness, phosphate, nitrate, depth and substrate types were remarkably suitable to support the growth of blue swimming crabs. Meanwhile, parameters such as salinity, DO, and temperature show lower quality which implied that the habitat is less suitable. However, the result of weighting and reclassification conclude that Lancang island waters is a decent habitat for blue swimming crab. Catch data show that 40% blue swimming crabs have small carapace size (7-11.83 cm) which is undersized and prohibited by law. Furthermore, about 68% of catch are quite light (30-147 gr) and the sex ratio of males to females was 1:2. It was also revealed that approximately 35% of female species were carrying eggs (BEF/barried female). Keywords: geospatial, fishing ground, suitability, Lancang Island, blue swimming crab.

scholarly journals VARIABILITY OF CARAPACE WIDTH SIZE AND ABUNDANCE OF BLUE SWIMMING CRABS (Portunus pelagicus Linnaeus) IN PATI WATERS

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Dyah Ika Nugraheni ◽  
Achmad Fahrudin ◽  
. Yonvitner
Keyword(s):  
Coastal Waters ◽  
Accretion Rate ◽  
Carapace Width ◽  
Management Strategies ◽  
Fishing Effort ◽  
Swimming Crab ◽  
Nearshore Zone ◽  
Portunus Pelagicus ◽  
Males And Females ◽  
Swimming Crabs

Fishing effort enhancement would put pressure on blue swimming crab resources and its ecosystem. The objective of this study was to determine the spatial distribution based on the size of the carapace width (CW), abundance, temperature, salinity, depth, and fishing intensity in Pati waters which was divided into two zones (zones 1=nearshore, zone 2=offshore). The result showed that the average of carapace width in zone 1 to zone 2 was significantly different (p <0.05), as well as between males and females. Average number of individual (abundance) was significantly different according to fishing areas and sex (p <0.05). The average of water temperature in zone 1 was higher than in zone 2, salinity in zone 1 was smaller than in zone 2, and the water depth in zone 1 was shallower than in zone 2. The higher the crab catch intensity leaded to the smaller the abundance and size of carapace width. Alternative management strategies were proposed such as to divert fishing grounds from coastal waters to offshore during low productivity season, to uphold rules on minimum legal size for catching (Lm = 107 mm),  to release of berried females catch, and to reduce accretion rate of gear and fishing fleet mainly in the coastal zone waters.Keywords:  blue swimming crab, carapace widht (CW), abundance, intensity of fishing

scholarly journals Perbandingan Hasil Tangkapan Rajungan Pada Alat Tangkap Bubu Kerucut dengan Umpan yang Berbeda (The Comparison Catch of Swimming crab In Trap with Different Bait)

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Fransisco P.T. Pangalila ◽  
Ivor L. Labaro
Keyword(s):  
Data Analysis ◽  
Comparative Analysis ◽  
Coastal Waters ◽  
Experimental Methods ◽  
T Test ◽  
Fishing Gear ◽  
Swimming Crab ◽  
Portunus Pelagicus ◽  
Test Analysis ◽  
Swimming Crabs

Swimming Crab (Portunus pelagicus) is one of the economically important marine commodities produced from the coastal waters of Indonesia. The Catching of swimming crabs directly from nature carried out using various types of fishing gear, one of which is a trap. Methods using experimental methods. Therefore, the objective of this research was to study the effect of  type of bait to catch swimming crab. Two kinds of bait, the scad mackerel and chicken intestines. Catch data were collected using 6 units of  trap, operated in coastal waters of Manado bay; and data analysis is based on a  t-test is done using a comparative analysis of the value of the middle observation sample pairs. Besides evaluation carapace size and weight (legal size) swimming crab based Permen KP nomor 1 tahun 2015. The catch was 76 swimming crabs in total, and the results of t-test analysis showed that the use of bait scad mackerel and chicken intestines on traps caused high significant effect in catch. The size of swimming crabs showed that nearly all eligible allowable catch of 71 individuals (93%) both carapace size and weight, and only 5 individuals (7%) who do not eligible allowable catch. Keywords : swimming crab, carapace size, trap baits, chicken intestines.   ABSTRAK Rajungan (Portunus pelagicus) merupakan salah satu komoditi hasil laut ekonomis penting yang dihasilkan dari perairan pantai Indonesia.  Penangkapan rajungan langsung dari alam dilakukan dengan menggunakan berbagai jenis alat tangkap, salah satunya adalah bubu.  Metode Penelitian menggunakan metode eksperimental. Penelitian ini bertujuan untuk mempelajari pengaruh jenis umpan terhadap hasil tangkapan rajungan. Dua jenis umpan yang digunakan, yaitu ikan layang dan usus ayam. Data tangkapan dikumpulkan dengan menggunakan 6 unit bubu, yang dioperasikan di perairan pantai Malalayang Teluk Manado; dan analisis data didasarkan pada uji t yang dikerjakan menggunakan analisis perbandingan nilai tengah contoh pengamatan berpasangan.  Selain itu dilakukan evaluasi ukuran karapas dan berat (legal size) rajungan berdasarkan Permen KP nomor 1 tahun 2015. Total hasil tangkapan 76 ekor, dan hasil analisis uji t menunjukkan bahwa penggunaan umpan ikan layang dan usus ayam pada bubu kerucut memberikan hasil tangkapan rajungan yang sangat berbeda nyata.  Ukuran hasil tangkapan rajungan yang diperoleh menunjukkan bahwa hampir semuanya memenuhi persyaratan tangkapan yang diperbolehkan yaitu 71 ekor (93 %) baik ukuran karapas maupun berat, dan hanya 5 ekor (7 %) yang tidak memenuhi persyaratan. Kata-kata kunci : rajungan, ukuran karapas, umpan bubu, usus ayam.

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