scholarly journals Kajian Struktur Ukuran Dan Parametr Populasi Kepiting Bakau (Scylla serrata) di Ekosistem Mangrove Teluk Bintan, Kepulauan Riau

2015 ◽  
Vol 15 (2) ◽  
Author(s):  
M. Tahmid, Achmad Fahrudin Dan Yusli Wardiatno
Keyword(s):  
Growth Parameters ◽  
Economic Value ◽  
Data Retrieval ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Small Scale ◽  
Natural Mortality ◽  
Mud Crab ◽  
Mangrove Crab ◽  
The Status

ABSTRAKKepiting bakau (Scylla serrata) merupakan salah satu potensi komoditas perikanan skala kecilyang memiliki nilai ekonomi tinggi. Kelimpahan populasi dipengaruhi oleh upaya penangkapan dankondisi ekosistem mangrove sebagai habitat utamanya. Produksi kepiting bakau di Teluk Bintanmenurun dan penyebabnya belum diketahui dengan pasti. Oleh karena itu, perlu dilakukan kajiantentang biologi kepiting bakau di Teluk Bintan. Penelitian ini bertujuan untuk mengkaji statuspopulasi kepiting bakau yang meliputi struktur ukuran, parameter pertumbuhan dan laju mortalitasdan eksploitasi. Pengambilan data kepiting bakau dilakukan dengan pendekatan yaitu fisher-basedsurvey. Hasil penelitian menunjukkan ukuran kepiting bakau yang tertangkap mulai dari lebar karapas(CW) 64-172 mm, ukuran fase muda kepiting jantan yang tertangkap mencapai 46,62% dan betinamencapai 48,06%, keduanya hampir setengah dari tangkapan total, ini menunjukkan bahwa alattangkap yang digunakan belum selektif. CW∞ jantan mencapai 176,93 mm lebih tinggi dari kepitingbetina sebesar 169,58 mm, namun sebaliknya nilai koefesien K jantan (0,360) lebih kecil dari betina(0,390), sehingga pertumbuhan kepiting bakau betina lebih cepat dari jantan. Perkiraan angkakematian alami (M) jantan = 0,5566 dan kematian akibat penangkapan (F) jantan = 0,6434 sedangkanM betina = 0,59 dan F betina = 0,41. Laju eksploitasi (E) kepiting jantan mencapai 53,62%, ini dapatdikatakan telah terjadi lebih tangkap atau over eksploitasi.Kata kunci: Scylla serrata, parameter pertumbuhan, struktur ukuran, mangrove and Teluk BintanABSTRACTMud crab (Scylla serrata) is one of the potential of small-scale fishery commodities that havehigh economic value. The abundance of the population is affected by the fishing effort and conditionsmangrove ecosystem as its main habitat. Mud crab production in the Gulf of Bintan declined and thecause is not known with certainty. Therefore, it is necessary to study on the biology of mud crab in theGulf of Bintan. This study aims to assess the status of mangrove crab population that includes the sizestructure, parameters of growth and the rate of mortality and exploitation. Data retrieval is done witha mangrove crab fisher-based survey. The results showed that the size of mud crab caught fromcarapace width (CW) 64-172 mm, the size of the young phase male crabs caught females reached46.62% and reached 48.06%, both are almost half of the total catch, it indicates that fishing gearused is not selective. CW∞ males reach 176.93 mm higher than the female crabs of 169.58 mm, butinstead value koefesien K males (0.360) is smaller than females (0.390), so that the growth of femalemud crabs faster than males. Estimated natural mortality rates (M) male = 0.5566 and deaths fromarrest (F) male = 0.6434 while M females female F = 0.59 and = 0.41. The rate of exploitation (E)male crabs reached 53.62%, can be said to have occurred over fishing or over-exploitation.Keywords: Scylla serrata, growth parameters, structure size, mangrove and bay Bintan

scholarly journals Kajian Struktur Ukuran Dan Parametr Populasi Kepiting Bakau (Scylla serrata) di Ekosistem Mangrove Teluk Bintan, Kepulauan Riau

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
M. Tahmid, Achmad Fahrudin Dan Yusli Wardiatno
Keyword(s):  
Size Structure ◽  
Growth Parameters ◽  
Carapace Width ◽  
Data Retrieval ◽  
Mangrove Ecosystem ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Small Scale ◽  
Mud Crab ◽  
Mangrove Crab

ABSTRAKKepiting bakau (Scylla serrata) merupakan salah satu potensi komoditas perikanan skala kecil yang memiliki nilai ekonomi tinggi. Kelimpahan populasi dipengaruhi oleh upaya penangkapan dan kondisi ekosistem mangrove sebagai habitat utamanya. Produksi kepiting bakau di Teluk Bintan menurun dan penyebabnya belum diketahui dengan pasti. Oleh karena itu, perlu dilakukan kajian tentang biologi kepiting bakau di Teluk Bintan. Penelitian ini bertujuan untuk mengkaji status populasi kepiting bakau yang meliputi struktur ukuran, parameter pertumbuhan dan laju mortalitas dan eksploitasi. Pengambilan data kepiting bakau dilakukan dengan pendekatan yaitu fisher-based survey. Hasil penelitian menunjukkan ukuran kepiting bakau yang tertangkap mulai dari lebar karapas (CW) 64-172 mm, ukuran fase muda kepiting jantan yang tertangkap mencapai 46,62% dan betina mencapai 48,06%, keduanya hampir setengah dari tangkapan total, ini menunjukkan bahwa alat tangkap yang digunakan belum selektif. CW∞ jantan mencapai 176,93 mm lebih tinggi dari kepiting betina sebesar 169,58 mm, namun sebaliknya nilai koefesien K jantan (0,360) lebih kecil dari betina (0,390), sehingga pertumbuhan kepiting bakau betina lebih cepat dari jantan. Perkiraan angka kematian alami (M) jantan = 0,5566 dan kematian akibat penangkapan (F) jantan = 0,6434 sedangkan M betina = 0,59 dan F betina = 0,41. Laju eksploitasi (E) kepiting jantan mencapai 53,62%, ini dapat dikatakan telah terjadi lebih tangkap atau over eksploitasi. Kata kunci: Scylla serrata, parameter pertumbuhan, struktur ukuran, mangrove and Teluk Bintan ABSTRACTMud crab (Scylla serrata) is one of the potential of small-scale fishery commodities that have high economic value. The abundance of the population is affected by the fishing effort and conditions mangrove ecosystem as its main habitat. Mud crab production in the Gulf of Bintan declined and the cause is not known with certainty. Therefore, it is necessary to study on the biology of mud crab in the Gulf of Bintan. This study aims to assess the status of mangrove crab population that includes the size structure, parameters of growth and the rate of mortality and exploitation. Data retrieval is done with a mangrove crab fisher-based survey. The results showed that the size of mud crab caught from carapace width (CW) 64-172 mm, the size of the young phase male crabs caught females reached 46.62% and reached 48.06%, both are almost half of the total catch, it indicates that fishing gear used is not selective. CW∞ males reach 176.93 mm higher than the female crabs of 169.58 mm, but instead value koefesien K males (0.360) is smaller than females (0.390), so that the growth of female mud crabs faster than males. Estimated natural mortality rates (M) male = 0.5566 and deaths from arrest (F) male = 0.6434 while M females female F = 0.59 and = 0.41. The rate of exploitation (E) male crabs reached 53.62%, can be said to have occurred over fishing or over-exploitation. Keywords: Scylla serrata, growth parameters, structure size, mangrove and bay Bintan

scholarly journals Pengaruh ablasi mata terhadap kecepatan kematangan gonad kepiting bakau (Sylla serrata) betina

2014 ◽  
Vol 1 (1) ◽  
pp. 14
Author(s):  
Muhammad Robi ◽  
Erlangga Erlangga
Keyword(s):  
Survival Rate ◽  
Economic Value ◽  
Gonadal Development ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Average Value ◽  
Gonadal Maturity ◽  
Mangrove Crab ◽  
Randomized Design ◽  
Completely Randomized Design

Kepiting bakau (Scylla serrata) merupakan jenis golongan Crustaceae   yang mengandung protein hewani yang cukup tinggi dan memiliki nilai ekonomis yang tinggi. Ablasi mata merupakan salah satu cara untuk menghilangkan hambatan perkembangan telur (gonad) pada kepiting bakau. Rancangan penelitian yang digunakan adalah Rancangan Acak Lengkap (RAL) non factorial dengan 4 perlakuan dan 3 ulangan. Adapun perlakuan dalam penelitian ini adalah perlakuan A (ablasi satu pasang mata), perlakuan B (ablasi mata kiri), C (ablasi mata kanan), D (tanpa ablasi).   Hasil penelitian menunjukkan bahwa kecepatan kematangan gonad tertinggi pada perlakuan C (ablasi mata kanan) yaitu pertumbuhan gonad mencapai 21,53% dan terendah terjadi  D (tanpa ablasi)  pertumbuhan gonad hanya 14,8%. Analisa statistik dengan uji F menunjukan bahwa ablasi mata berpengaruh terhadap kecepatan kematangan gonad kepiting bakau. Pertambahan bobot tertinggi  terdapat pada perlakuan C (ablasi mata kanan) yaitu sebesar 2,67 gr kemudian disusul oleh D (tanpa ablasi)  sebesar 1,89 gr  dan terakhir  pada B (ablasi mata kiri) dengan nilai rata-rata sebesar 0,77 gr. Tingkat kelangsungan hidup terbaik terdapat pada perlakuan D (tanpa ablasi)   yaitu 100%, perlakuan B (ablasi mata kiri) 77,77%, perlakuan C (ablasi mata kanan) 66,66% dan kelansungan hidup terendah terjadi pada perlakuan A (ablasi satu pasang mata) 0%. Rata-rata kualitas air selama penelitian adalah suhu 27 0C dan Ph 7,65.Mangrove crab (Scylla serrata) have been classifying in Crustaceae clas that containing high animal protein and high economic value. Ablation of the eye is an solution to eliminate the egg development (gonads) barriers in the mangrove crab. The research design used a completely randomized design (CRD) non- factorial with 4 treatments and 3 replications. Treatment in this study were the treatment of A (ablation of the pairs of eyes), treatment B (left eye ablation), treatment C (right eye ablation), D (without ablation). The results showed that the highest rate of gonadal maturation was in treatment C (right eye ablation) where gonadal development growth reached 21.53 %, whereas the lowest was in treatment D (without ablation) where gonadal development growth was only 14.8 %. Statistical analysis by F test showed that ablation of the eye was affected the mud crab gonadal maturity. The Weight gain was found highest in the treatment C (right eye ablation) that reached 2.67 g and followed by treatment D (without ablation) 1.89 grams and the last in the treatment B (left eye ablation) with was an average value 0.77 grams. The higest survival rate was found in treatment D (without ablation) 100 %, treatment B (left eye ablation) 77.77 %, treatment C (right eye ablation) 66.66 % and the lowest survival rate was occurred in treatment A (ablation of the pairs of eyes) 0 %. The avarge values of water quality during the study showed that the temperature was reched 27 0C and pH was 7, 65.

scholarly journals PARAMETER POPULASI DAN TINGKAT PEMANFAATAN KEPITING BAKAU (Scylla serrata Forsskal, 1775) DI PERAIRAN SEBATIK, KALIMANTAN UTARA

2018 ◽  
Vol 24 (3) ◽  
pp. 187
Author(s):  
Tirtadanu Tirtadanu ◽  
Umi Chodrijah
Keyword(s):  
Growth Parameters ◽  
Carapace Width ◽  
Fishing Effort ◽  
Scylla Serrata ◽  
Von Bertalanffy ◽  
Population Parameters ◽  
Mud Crab ◽  
Female Crab ◽  
Male Crab ◽  
Exploitation Rate

Salah satu informasi yang diperlukan untuk merumuskan pengelolaan kepiting bakau (Scylla serrata Forsskal, 1775) yang berkelanjutan adalah parameter populasi dan tingkat pemanfaatannya. Penelitian ini bertujuan untuk mengkaji parameter populasi dan tingkat pemanfaatan kepiting bakau di perairan Sebatik. Penelitian dilakukan pada Maret-Desember 2017. Sampel kepiting bakau di peroleh dari hasil tangkapan nelayan dengan alat tangkap bubu di perairan Sebatik. Pertumbuhan dianalisis berdasarkan persamaan Von Bertalanffy dengan mengamati pergeseran struktur ukuran kepiting tiap bulan dan tingkat pemanfaatan diperoleh dari metode kurva konversi panjang dengan hasil tangkapan. Hasil penelitian menunjukkan kepiting bakau yang tertangkap bubu di perairan Sebatik berukuran lebar karapas (carapace width) antara 84-144 mmCW dengan rata-rata ukuran yang tertangkap adalah 107,05±12,3 mmCW pada kepiting jantan dan 110,2±8,86 mmCW pada kepiting betina. Pertumbuhan berat kepiting bakau jantan lebih cepat dibandingkan ukurannya (b=3,6) sebaliknya pertumbuhan berat kepiting bakau betina lebih lambat dibandingkan ukurannya (b=2,5). Nisbah kelamin kepiting bakau menunjukkan kondisi tidak seimbang (5,5 : 1) dengan proporsi jantan lebih dominan dibandingkan betina. Lebar karapas asimptotik (CW) kepiting bakau jantan adalah 151,2 mmCW dan betina adalah 140,5 mmCW. Laju pertumbuhan (K) kepiting bakau adalah 0,75 tahun-1 pada kepiting jantan dan 0,79 tahun-1 pada kepiting betina. Status pemanfaatan kepiting bakau telah berada dalam tahapan mendekati lebih tangkap (E=0,5-0,55) sehingga disarankan tidak melakukan penambahan upaya penangkapan kepiting bakau di perairan Sebatik. One of the information needed for formulating the sustainable management of mud crab is the availability of information on the population parameters and its exploitation rate. The current research aimed to study the population parameters and the exploitation rate of mud crab in Sebatik Waters. Field research was conducted in March – December 2017. Samples of mud crab were obtained from the catch of fisherman by trap in Sebatik Waters. The Von Bertalanffy growth parameters were constructed through monthly modals progression analysis of the size of carapace width frequencies distributions and the exploitation rate was estimated through the method of length converted catch curve. The results showed that the carapace width of mud crabs caught by trap in Sebatik Waters ranged between 84 to 144 mmCW with the mean size of 107.05±12.3 mmCW for male and 110.2±8.86 mmCW for female. The growth of weights of male crab (b=3.6) is faster than its size, while the growth of weight of female crab was slower than its size (b=2,5). The sex ratio of mud crab was unbalanced (5.5 : 1) that the proportion of male was more dominant than female. Asymptotic carapace width (CW) of mud crab was 151.2 mmCW for male and 140.5 mmCW for female. The growth rate (K) of mud crab was 0.75 year-1 for male and 0.79 year-1 for female. The exploitation status of mud crab was starting to overfishing (E=0,5-0,55) so it suggest to not increase the fishing effort of mud crab fishery  in Sebatik Waters.

scholarly journals Yield per recruit of the peacock bass Cichla monoculus (Spix and Agassiz, 1831) caught in Lago Grande at Manacapuru (Amazonas – Brazil)

2014 ◽  
Vol 74 (1) ◽  
pp. 226-230 ◽  
Author(s):  
CP Campos ◽  
CEC Freitas
Keyword(s):  
Growth Parameters ◽  
Fishing Effort ◽  
Maximum Sustainable Yield ◽  
Minimum Size ◽  
Small Scale ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Yield Per Recruit ◽  
Peacock Bass ◽  
Actual Size

We evaluated the stock of peacock bass Cichla monoculus caught by a small-scale fishing fleet in Lago Grande at Manacapuru. The database was constructed by monthly samplings of 200 fish between February 2007 and January 2008. We measured the total length (cm) and total weight (gr) of each fish. We employed previously estimated growth parameters to run a yield per recruit model and analyse scenarios changing the values of the age of the first catch (Tc), natural mortality (M), and fishing mortality (F). Our model indicated an occurrence of overfishing because the fishing effort applied to catch peacock in Lago Grande at Manacapuru is greater than that associated with the maximum sustainable yield. In addition, the actual size of the first catch is almost half of the estimated value. Although there are difficulties in enforcing a minimum size of the catch, our results show that an increase in the size of the first catch to at least 25 cm would be a good strategy for management of this fishery.

scholarly journals Incorporating the Ecological, Socio-economic and Institutional Conceptual Model Framework for Sustainable Management of Small-scale Mud Crab (Scylla serrata) Fishery in Western Seram Regency, Indonesia

2021 ◽  
Vol 19 (3) ◽  
pp. 207-219
Author(s):  
Yuliana Natan ◽  
◽  
Johannes M.S. Tetelepta ◽  
Jesaja A. Pattikawa ◽  
Ong T.S. Ongkers ◽  
...  
Keyword(s):  
Conceptual Model ◽  
Sustainable Management ◽  
Economic Value ◽  
State Level ◽  
Scylla Serrata ◽  
Small Scale ◽  
Consumer Attitude ◽  
Mud Crab ◽  
Model Framework ◽  
Management Actions

Mud crab Scylla serrata of Kotania Bay and Pelita Jaya Bay of Western Seram District, has been harvested by local fishermen for more than 25 years. The mud crab has high economic value, and there is always a market for this fishery. The economic dependence of the fishermen forces them to harvest this resource extensively. No existing management strategy and extensive exploitation leads to unsustainable conditions of this fishery. With inadequate data condition, the Driver-Pressure-State-Impact-Response (DPSIR) model constructs an ecological, social-economy, and institutional conceptual model framework for sustainable management of this fishery. The driving force (D) in this fishery comes from the local fishers harvesting the mud crab. The two most sensitive attributes that affected mud crab sustainability from Rapfish analysis were used as state-level of DPSIR methodology. The result shows that the most sensitive variables from ecological, socio-economy, and institution were: caught before maturity, mud crab size, consumer attitude towards sustainability, just management, government quality, and monitoring and reporting, respectively. It was concluded that this conceptual model allows a better understanding of how the mud crab S. serrata system works and management actions taken at different system components. This conceptual model framework can be a useful tool to incorporate the participation of stakeholders, managers, and scientists in the process of a sustainable management plan.

scholarly journals Study of Long Weight Relation of Scylla serrata In Mangrove Forest Around The Wet Laboratory FPIK Eeast Likupang District North Minahasa

2017 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Stivensian M. Tumbel ◽  
Gaspar D. Manu ◽  
Alex D. Kambey
Keyword(s):  
Mangrove Forest ◽  
Economic Value ◽  
Growth Patterns ◽  
Scylla Serrata ◽  
Fishing Gear ◽  
Aquatic Biota ◽  
Mud Crab ◽  
Mangrove Crab ◽  
Relationship Of ◽  
The Relationship

Mud crab (Scylla serrata) is a ten-legged crustacean animal from Brachura infraordo, known to have a very short tail (in Greek: brachy = short, ura = tail). Mangrove crab is one of the aquatic biota that has significant economic value and its life is strongly influenced by the existence of mangrove forest. The purpose of this study is to identify and analyze the relationship of weight and growth patterns of mangrove crab (Scylla serrata). Sampling is obtained by catching activities using fishing gear that is bubu (chang). Based on the results of research conducted in the area of Mangrove Forest around Wet Laboratory Faculty of Fisheries and Marine Sciences, Likupang Timur in August - September 2017. Mangrove crab (Scylla serrata) in the can through research obtained as many as 32 individuals.Keywords: Mangrove Crab (Scylla serrata), Long Weight Relation, Growth Pattern, East Likupang ABSTRAKKepiting bakau (Scylla serrata) adalah binatang anggota crustasea berkaki sepuluh dari infraordo Brachura, yang dikenal mempunyai ekor yang sangat pendek (dalam bahasa Yunani : brachy = pendek, ura = ekor). Kepiting bakau adalah salah satu biota perairan yang bernilai ekonomis penting dan kehidupannya sangat dipengaruhi oleh keberadaan hutan mangrove. Adapun tujuan dari penelitian ini yaitu untuk mengidentifikasi dan menganalisis hubungan panjang berat berserta pola pertumbuhan dari kepiting bakau (Scylla serrata). Pengambilan sampel diperoleh dengan melakukan kegiatan penangkapan menggunakan alat tangkap yaitu bubu (chang). Berdasarkan hasil penelitian yang dilakukan di Daerah Hutan Mangrove sekitar Laboratorium Basah Fakultas Perikanan dan Ilmu Kelautan, Likupang Timur pada bulan Agustus – September 2017. Kepiting bakau (Scylla serrata) yang di dapat selama melalukan penelitian diperoleh sebanyak 32 individu. Kata Kunci : Kepiting Bakau (Scylla serrata), Hubungan Panjang Berat, Pola  Pertumbuhan, Likupang Timur.

scholarly journals Distribusi Scylla spp. di perairan estuari Sungai Donan Segara Anakan Bagian Timur, Cilacap

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Sulistiono Sulistiono ◽  
Nurul Musyariafah Yahya ◽  
Etty Riani
Keyword(s):  
Economic Value ◽  
Scylla Serrata ◽  
Mangrove Forests ◽  
Mud Crab ◽  
Mangrove Species ◽  
Central Java ◽  
Rhizophora Apiculata ◽  
Mangrove Ecosystems ◽  
Avicennia Alba ◽  
Mangrove Crabs

Mangrove forests are ecosystems that make up coastal areas and river estuaries. The examples of mangrove ecosystems found in Indonesia are in Segara Anakan, Central Java. One of the aquatic biota with the economic value found in the mangrove forest ecosystem is the mud crab (Scylla spp.). The purpose of this study was to assess the distribution of mangrove crabs (Scylla spp.) to the presence of mangrove species in the mouth of the Donan River, Segara Anakan. A sampling of crabs and observations of mangrove vegetation were carried out at five stations spread from the river to the sea. The results showed that there were three types of mangrove crabs caught in the vicinity of the study, namely Scylla tranquebarica, S. olivacea, and S. serrata. The types of mangroves found include Rhizophora apiculata, R. mucronata, Avicennia rumphiana, A. alba, A. officinalis, and Nypa. Regression analysis showed that mangrove density correlated with the abundance of Scylla tranquebarica and Scylla olivacea, but contradicts the abundance of Scylla serrate. PCA analysis showed that the Crab species Scylla tranquebarica and Scylla olivacea were associated with mangroves of Avicennia alba, Avicennia rumphiana, and Rhizophora apiculata. Meanwhile, Scylla serrata crabs are associated with Avicennia officinalis.

scholarly journals KAJIAN RESIKO KEPITING BAKAU (Scylla serrata) DI ESTUARI MAHAKAM, KALIMANTAN TIMUR

2019 ◽  
Vol 25 (1) ◽  
pp. 15
Author(s):  
Aisyah Aisyah ◽  
Setiya Triharyuni ◽  
Eko Prianto ◽  
Husnah Husnah
Keyword(s):  
Natural Resource ◽  
Scylla Serrata ◽  
Risk Level ◽  
Mud Crab ◽  
Susceptibility Analysis ◽  
Fish Resources ◽  
Mangrove Crab ◽  
Medium Level ◽  
Mangrove Crabs ◽  
Ecosystem Changes

Kawasan estuari merupakan wilayah yang kaya akan unsur hara di daerah pantai. Perubahan ekosistem pantai, seperti terjadinya pendangkalan menyebabkan penurunan luasan mangrove. Dampak yang terjadi merupakan penyumbang bagi kerentanan sumberdaya kepiting bakau di daerah tersebut. Tujuan penelitian ini adalah untuk mengetahui tingkat resiko potensi kerentanan sumber daya kepiting bakau dan keberlanjutannya di estuari Sungai Mahakam Kalimantan Timur. Analisis kerentanan menggunakan perangkat lunak PSA (Productivity and Susceptibility Analysis). Hasil analisis menunjukkan bahwa potensi kepiting bakau di Eestuari Mahakam mempunyai kerentanan tingkat rendah (tingkat kerentanan =1,3). Nilai produktivitas (kemampuan pulih sumber daya) menunjukan nilai yang lebih tinggi (2,1) dari pada nilai susceptabilitas (tingkat resiko sumber daya ikan terhadap aktivitas perikanan di perairan tersebut) yaitu 1,9. Dengan kondisi tersebut maka peluang keberlanjutan ketersediaan kepiting bakau di estuari Mahakam berada dalam tingkat sedang.Estuaries constitute an extremely valuable natural resource in the coastal areas. The coastal ecosystem changes such as deforestation of the estuarine caused the decrease of mangrove forestry. These impacts directly contribute to the vulnerability of mud crab resources. The purpose of this research was to determine the risk level of potential vulnerability of mangrove crab resources in the Mahakam estuary. Vulnerability analysis using Productivity and Susceptibility Analysis (PSA) software. The results showed that mangrove crabs in the Mahakam estuary were low vulnerable (vulnerability level of 1.3). Value of productivity (the ability to recover resources) higher than susceptibility (level of risk of fish resources to fisheries activities in those areas). It, means that the chances for sustainability of mangrove crab in Mahakam estuary were medium level.

scholarly journals Study of Growth and Survival of Mud Crab (Scylla serrata, Forskal) with Different Salinity Levels in culture media

2021 ◽  
Vol 934 (1) ◽  
pp. 012015
Author(s):  
Eddiwan ◽  
T Dahril ◽  
Adriman ◽  
Budijono ◽  
Efawani ◽  
...  
Keyword(s):  
Culture Media ◽  
Salt Content ◽  
Optimal Level ◽  
Scylla Serrata ◽  
Mud Crab ◽  
Growth And Survival ◽  
Mangrove Crab ◽  
Salinity Levels ◽  
B 31 ◽  
Mud Crabs

Abstract The aim of this study to find out the optimal level of salinity for the growth and survival of the mud crab (Scylla serrata). The weight of crab seeds were about 47.65-51.32 grams and the carapace length ranged from 64.35-71.30 mm, then put into 12 tanks (1 m x 1 m x 0.4 m) with a density of 4 crab seed per tank. During the maintenance of this test, mangrove crab was fed with fresh chicken intestines as much as 10% of its body weight per day. Water changes are carried out more than 150% per week. At the beginning of the experiment, each tank was conditioned to the same water salinity in all experimental units, namely 33 ppt. To see the effect of differences in salinity levels on the growth and survival of mud crabs, 4 treatments were made consisting of (A) 33 ppt salt content, (B) 31 ppt salt content, (C). The salt content is 29 ppt, and (D) the salt content is 27 ppt. From the results of this experiment, it is known that a decrease in the salt content of 4 ppt is the best treatment for the growth of mud crabs, but has no effect on the survival value.

scholarly journals Seasonal dynamics of small-scale fisheries in the Adriatic Sea

2018 ◽  
Vol 19 (1) ◽  
pp. 21 ◽  
Author(s):  
FABIO GRATI ◽  
ADMIR ALADZUZ ◽  
ERNESTO AZZURRO ◽  
LUCA BOLOGNINI ◽  
PIERLUIGI CARBONARA ◽  
...  
Keyword(s):  
Seasonal Dynamics ◽  
Adriatic Sea ◽  
Economic Value ◽  
Fishing Effort ◽  
Small Scale ◽  
Target Species ◽  
Frequency Distributions ◽  
Small Scale Fisheries ◽  
Blue Growth ◽  
Physical And Chemical

The main aim of the present study is to increase the knowledge on the seasonal dynamics of the set gears used by Adriatic small-scale fisheries (SSFs) through the collation of data (landings, fishing effort, composition of catches, length-frequency distributions of target species and economic value of landings) on target species,. The study focused on the three set gears mainly used in the basin: gillnets, trammel nets and traps. The results confirmed that SSFs are diverse, complex and dynamic, representing an economic and social engine and providing seafood and employment to local economies. In the Adriatic Sea, SSFs exploit coastal fishing grounds where the seasonal fluctuations of the physical and chemical parameters of the water column strongly influence the occurrence of the different species. Because of this, many different types of set gears are currently used to catch a pool of target species over the year. Fishermen use more than one set gear during the year and tend to increase the fishing effort when the target species concentrate inside the coastal areas during the recruitment or the spawning season. Accordingly, landings reached the highest values during such periods and often include a large portion of juveniles and/or spawners. The study highlighted that the lack of appropriate data and complete statistics is still one of the main constraints for most of the Adriatic coastal countries, as few countries have in place routinely monitoring programs while others are dealing mostly with estimates. These gaps often have the effect of marginalizing and undervaluing the real role of SSFs in a Blue Growth process.

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