Ecosystem trophic structure and fishing effort simulations of a major fishing ground in the northeastern Mediterranean Sea (Thermaikos Gulf)

2021 ◽  
pp. 107667
Author(s):  
Donna Dimarchopoulou ◽  
Konstantinos Tsagarakis ◽  
Georgios Sylaios ◽  
Athanassios C. Tsikliras
Keyword(s):  
Mediterranean Sea ◽  
Trophic Structure ◽  
Fishing Effort ◽  
Fishing Ground

scholarly journals Spatial and temporal distribution of fishing resources exploited by the Manaus fishing fleet, Amazonas, Brazil

2007 ◽  
Vol 67 (4) ◽  
pp. 651-656 ◽  
Author(s):  
VS. Batista ◽  
M. Petrere Jr
Keyword(s):  
Amazon Basin ◽  
Temporal Distribution ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Rural And Urban ◽  
Environmental Variations ◽  
Fishing Resources ◽  
The Right ◽  
Urban People ◽  
Operational Aspects

Fishing resources are important generators of income and food for the rural and urban people in the Amazon. The present paper investigates fishing and environmental variables determining fishing production landed in Manaus and evaluates the relative abundance of commercial fishes in the different sub-systems of the Central Amazon basin. Information collected was used to test the new catch index derived from multiple regressions with the following significant variables: number of fisherman days fishing; distance of the fishing ground from Manaus; amount of ice carried during the trip; and river level. There were no significant differences between mean catch values of the Purus, Madeira and Juruá sub-systems. These results suggest that the tributaries of the right margin were very similar and were the most productive in commercial terms. The actual production varies according to the recent magnitude of fishing effort, environmental variations and operational aspects of fishing, particularly ice consumption.

scholarly journals A fishing ground benthic ecosystem improved during the economic crisis

2018 ◽  
Vol 76 (2) ◽  
pp. 402-409
Author(s):  
Irini Tsikopoulou ◽  
Chris J Smith ◽  
Nadia K Papadopoulou ◽  
Elena Eleftheriadou ◽  
Ioannis Karakassis
Keyword(s):  
Economic Crisis ◽  
Eastern Mediterranean ◽  
Ecological Status ◽  
Ecosystem Approach ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Ecological Studies ◽  
Ecological Quality Status ◽  
Traditional Fishing

AbstractFisheries have global socioeconomic and ecological effects. Long-term ecological studies could be beneficial to ecosystem approach management and biodiversity conservation, however, they are rare. In this study, the impacts of bottom trawling on a traditional fishing ground in the Eastern Mediterranean were addressed and an improvement in diversity metrics and ecological quality status were detected and ascribed to the Greek economic crisis. After 18 years, there was a modest increase in species richness, total abundance, and ecological status in the unaffected zone and more pronounced improvement in the trawled zone pointing at a possible link to a decrease in fishing effort. This upturn emphasized the strong link between financial activities and ecology. The present study underlines the multiple and variable effects of economy not only on countries and citizens but also on the environment and ecosystem conservation and management.

scholarly journals DAMPAK SUBSIDI SOLAR TERHADAP KEBERLANJUTAN USAHA PERIKANAN TANGKAP DI BITUNG DAN PELABUHANRATU

2017 ◽  
Vol 7 (2) ◽  
pp. 139
Author(s):  
Estu Sri Luhur ◽  
Yesi Dewita Sari
Keyword(s):  
Diesel Fuel ◽  
Secondary Data ◽  
Fishing Effort ◽  
Primary Data ◽  
Fishing Ground ◽  
Dummy Variable ◽  
Fishery Resources ◽  
North Sulawesi ◽  
Negative Effect

Penelitian ini bertujuan untuk mengkaji peranan subsidi harga solar terhadap keberlanjutan usaha perikanan tangkap. Penelitian dilakukan pada tahun 2010 di dua lokasi dengan tingkat pemanfaatan sumber daya perikanan yang berbeda, yaitu Bitung dan Palabuhanratu. Data yang digunakan terdiri dari data primer dan data sekunder. Data primer diperoleh melalui wawancara kepada nelayan yang menggunakan alat tangkap berbeda di kedua lokasi penelitian, kemudian dianalisis dengan menggunakan regresi linier berganda. Hasil penelitian menunjukkan bahwa adanya subsidi harga solar menyebabkan semakin besar keuntungan yang diterima oleh nelayan karena biaya operasional yang ditanggung oleh nelayan semakin rendah. Di Bitung hasil analisis menunjukkan bahwa variabel dummy (D) berpengaruh signifikan terhadap penerimaan sebesar 2,28 yang artinya bahwa pemberian subsidi solar kepada nelayan dapat meningkatkan penerimaan sebesar 2,28%. Dengan demikian, subsidi solar mampu mendorong usaha perikanan tangkap nelayan di Bitung secara berkelanjutan. Sementara itu di Palabuhanratu menunjukkan bahwa jumlah hari melaut (trip) dan subsidi solar (D) berpengaruh negatif terhadap penerimaan. Makin lama hari melaut di fishing ground Teluk Palabuhanratu justru mengurangi penerimaan nelayan. Hasil ini menunjukkan bahwa pemanfaatan sumber daya perikanan di Teluk Palabuhanratu terindikasi adanya kelebihan upaya penangkapan sehingga subsidi yang diberikan seharusnya bertujuan memfasilitasi nelayan untuk menangkap di luar Teluk Palabuhanratu. Title: Role of Price Subsidies on Diesel Fuel to Sustainability of Fishing Effort in Bitung, North Sulawesi and Palabuhanratu, West JavaThis study aims to assess the role of price subsidies on diesel fuel to the sustainability of fishing. Research was carried out at two locations of Bitung and Palabuhanratu representing different level of fishery resources utilization in 2010. Data used consists of primary and secondary data. Primary data were obtained through interviews with fishers using different gear on both sites and then analyzed using multiple regression. Results showed that diesel price subsidies causes the greater benefits received by the fishermen because the operational costs incurred by the fishermen are getting lower. In Bitung result of the analysis shows that the dummy variable (D) significant on revenue of 2.28 which means that the provision of diesel subsidies for fishermen to increase their revenue to 2.28%. Thus, the diesel subsidies could encourage fishermen fishing effort in Bitung in a sustainable manner. Meanwhile, in the Palabuhanratu result showed that number of days at sea (trip) and diesel subsidies (D) have negative effect to the revenue. The longer days at sea in the fishing ground Palabuhanratu Bay instead reduce fishing revenue. It means, utilization of fishery resources in the Palabuhanratu Bay have indicated on excess fishing effort, so that subsidy given should be aimed at facilitating fisher to fishing outside the Palabuhanratu Bay.

scholarly journals Evidence that spillover from Marine Protected Areas benefits the spiny lobster (Panulirus interruptus) fishery in southern California

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hunter S. Lenihan ◽  
Jordan P. Gallagher ◽  
Joseph R. Peters ◽  
Adrian C. Stier ◽  
Jennifer K. K. Hofmeister ◽  
...  
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Spiny Lobster ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Catch Per Unit Effort ◽  
Panulirus Interruptus ◽  
The Status ◽  
Larval Production ◽  
And Behavior

AbstractMarine Protected Areas (MPAs) are designed to enhance biodiversity and ecosystem services. Some MPAs are also established to benefit fisheries through increased egg and larval production, or the spillover of mobile juveniles and adults. Whether spillover influences fishery landings depend on the population status and movement patterns of target species both inside and outside of MPAs, as well as the status of the fishery and behavior of the fleet. We tested whether an increase in the lobster population inside two newly established MPAs influenced local catch, fishing effort, and catch-per-unit-effort (CPUE) within the sustainable California spiny lobster fishery. We found greater build-up of lobsters within MPAs relative to unprotected areas, and greater increases in fishing effort and total lobster catch, but not CPUE, in fishing zones containing MPAs vs. those without MPAs. Our results show that a 35% reduction in fishing area resulting from MPA designation was compensated for by a 225% increase in total catch after 6-years, thus indicating at a local scale that the trade-off of fishing ground for no-fishing zones benefitted the fishery.

scholarly journals ANALISIS BIOEKONOMI SUMBER DAYA IKAN TENGGIRI (Scomberomorus commerson) DI PERAIRAN KABUPATEN INDRAMAYU JAWA BARAT)

2014 ◽  
Vol 4 (2) ◽  
pp. 117
Author(s):  
Lugas Lukmanul Hakim ◽  
Zuzy Anna ◽  
Junianto Junianto
Keyword(s):  
Natural Resources ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Survey Method ◽  
Fishing Gear ◽  
Total Allowable Catch ◽  
Spanish Mackerel ◽  
Management Regime ◽  
Gill Net ◽  
Scomberomorus Commerson

Penelitian ini memaparkan analisis bioekonomi pemanfaatan sumber daya ikan tenggiri pada berbagai rezim melalui Model Gordon Schaefer dengan model estimasi parameter biologi CYP serta arah kebijakan pengelolaannya di Kabupaten Indramayu. Penelitian ini dilaksanakan pada Bulan Februari-Juli 2014 dengan metode survey melalui analisis kuantitatif deskriptif. Hasil penelitian menunjukkan laju pertumbuhan intrinsik (r) adalah 10,291 ton/tahun, koefisien daya tangkap (q) adalah 0,001673 ton/trip, daya dukung lingkungan adalah 250,028 ton/tahun, biaya (c) adalah 1,762 Rp/trip dan harga (p) adalah 30,750 Rp/ton. Upaya maksimum lestari (EMSY) yaitu 3076 trip/tahun dengan nilai produksi maksimum lestari (hMSY) sebesar 643,260 ton/tahun. Upaya MEY (EMEY) sebesar 2654 trip/tahun dengan produksi (hMEY) sebesar 631,141 ton/tahun. Upaya penangkapan perikanan terbuka (Eoa) adalah 5.308 trip/tahun dengan produksi (hOA) sebesar 304,689 ton/tahun. Kegiatan pemanfaatan menunjukkan tangkap lebih secara biologi dan ekonomi. Implementasi kebijakan dari penelitian ini adalah pembatasan upayasebesar 314-736 trip, pengaturan armada alat tangkap jaring insang hanyut adalah 353-409 unit, payang 0-5 GT adalah 409-474 unit, payang > 5-10 GT adalah 73-85 unit, Jumlah tangkapan diperbolehkan ikantenggiri sebesar 514,608 ton dengan kuota jaring insang hanyut sebesar 485,680 ton, payang 0-5 GT sebesar 5,772 ton, payang > 5-10 GT sebesar 23,156 ton, pengaturan teknis lainnya (perlindungan SDAdan DPI, pengawasan pemanfaatan sumber daya dan pungutan perikanan tangkap).Title: Bioeconomic Analysis of Narrow-barred Spanish Mackerel (Scomberomorus commerson) in The Water of Indramayu Regency West JavaThis research analyzed bioeconomic modelling of narrow-barred spanish mackerel in every fisheries management regime through Gordon Schaefer Model and CYP Parameter Estimation model, also a direction of its management policy in Indramayu Region. This research was conducted from February to July 2014, survey method and descriptive quantitative analysis were used in carrying out this research. The results of this research indicated that intrinsic growth parameter (r) of narrow-barredspanish mackerel approximately 10,291 ton/year, catchability coefficient (q) was about 0,001673 ton/trip, carrying capacity (K) reached at 250,028 ton/year, cost (c) was 1,762 Rp/trip and price (p) was 30,750Rp/ton. Maximum sustainable yield fishing effort (EMSY) reached at 3,076 trip/year with productionof MSY (hMSY) approximately 643,260 ton/year. MEY fishing effort (EMEY) reached 2,654 trip/year with MEY production (hMEY) Approximately 631,141 ton/year. Open access fishing effort (Eoa) reached about 5.308 trip/year with production (hOA) approximately 304,689 ton/year. Harvesting of narrow-barred spanish mackerel indicated biological and economic overfishing. The implementation from this research results were conducting limited entry for 314-736 trip; controlling fishing fleet for each fishing gear: gill net (< 5 GT) was about 353-409 unit, seine net (< 5 GT) was about 409-474 unit, others seine net (>5- 10GT) was 73-85 unit; Total Allowable catch of narrow-barred spanish mackerel was about 514,608 ton with quote for every fishing gear: gill net was about 485,680 ton, seine net (<5GT) approximately 5,772 ton,others seine net (>5-10GT) was about 23,156 ton; and others in technical control (natural resources and fishing ground conservation, controlling of natural resources harvesting and fishing fee aplication).

scholarly journals STRATEGI PENGELOLAAN SUMBER DAYA UDANG LAUT DALAM SECARA BERKELANJUTAN DI INDONESIA

2013 ◽  
Vol 5 (1) ◽  
pp. 47
Author(s):  
Ali Suman ◽  
Fayakun Satria
Keyword(s):  
Deep Sea ◽  
Early Stage ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Total Allowable Catch ◽  
Shallow Marine ◽  
Management Measures ◽  
Long Run ◽  
Sea Area ◽  
Untapped Resource

<p>Pemanfaatan sumber daya udang di Indonesia dilakukan pada wilayah perairan laut dangkal dan status pengusahaannya sudah dalam tahapan jenuh (over-fishing). Apabila kondisi ini dibiarkan dalam jangka panjang tanpa adanya usaha pengelolaan yang berkelanjutan, maka akan menyebabkan kelestarian sumber daya udang akan terancam dan bahkan bisa punah. Salah satu hal yang harus dilakukan dalam mengantisipasinya adalah mencari daerah penangkapan baru di perairan laut dalam, berupa sumber daya udang yang potensial dan belum pernah dimanfaatkan (untapped resources). Komposisi jenis udang laut dalam di perairan Indonesia lebih dari sekitar 38 jenis dengan jenis udang yang mendominasi adalah Plesiopenaeus edwardsianus dan Aristeus virilis serta alat tangkap yang disarankan untuk pemanfaatannya adalah bubu laut dalam tipe silinder. Potensi penangkapan udang laut dalam di Kawasan Barat Indonesia (KBI) sebagai 640 ton per tahun dan di Kawasan Timur Indonesia (KTI) sebagai 2.840 ton per tahun. Agar pengelolaan sumber<br />daya udang laut dalam dapat dilakukan berkelanjutan, maka harus dikelola dari awal pemanfaatannya. Strategi pengelolaan yang harus dilakukan adalah membatasi upaya penangkapan pada tingkat upaya sekitar 285 armada bubu laut dalam di KBI dan sekitar 1.250 armada bubu laut dalam di KTI. Selain itu harus dilakukan penutupan musim dan daerah penangkapan serta dilakukan penetapan kuota penangkapan.</p><p>The utilization of Indonesia’s shrimps resources are commonly taking from shallow marine water while its status is currently on overfishing stage. In the long run without appropriate management will threat its sutainability and may be worsen to become extinct. A possible anticipition is finding a new fishing ground at deep sea area for potential deep sea shrimps as untapped resource. Deep sea shrimps species composition have been identified for more than 38 species with mainly dominated by Plesiopenaeus edwardsianus and Aristeus virili. Recommended fihing gear for utilizing those resource is deep sea cylinder pots. Deep sea shrimps fishing potency whithin Western Indonesia Area (WIA) was estimated for 640 mt/year and Eastern Indonesia Area (EIA) was 2.840 mt/year. Asssuring the sustainability of deep sea shrimp resource require right and apropriate management apply since the early stage. It is proposed to adopt several management measures such as limit the fishing effort for 285 deep sea pots within WIA and 1.250 deep sea pots within EIA, apply close area and fishing season and determine total allowable catch.</p>

scholarly journals Discard composition associated with the deep water rose shrimp fisheries (Parapenaeus longirostris, Lucas 1846) in the south-central Mediterranean Sea

2017 ◽  
Vol 18 (1) ◽  
pp. 53 ◽  
Author(s):  
G. MILISENDA ◽  
S. VITALE ◽  
D. MASSI ◽  
M. ENEA ◽  
V. GANCITANO ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Deep Water ◽  
Fishing Ground ◽  
P Value ◽  
Total Catch ◽  
The South ◽  
Central Mediterranean ◽  
South Central ◽  
Central Mediterranean Sea ◽  
Shrimp Fisheries

Discarding in fisheries is believed to be a waste of natural resources, as it is the part of the total catch brought on board but then returned to the sea dead or alive for any reason. This study aims to advance knowledge of the discards associated with the deep water rose shrimp fisheries in the south-central Mediterranean Sea. We address this issue by examining the data collected within the module of commercial catch monitoring (Campbiol) of European data collection framework (DCF) between January 2009 and December 2013. Multivariate data analysis and the generalized additive model (GAMs) were used to assess the spatio-temporal composition of the discard and factors influencing its distribution. Overall, discard represented 32.9±15.4% of the total catch. Multiple analysis of variance highlighted the significant effect on discard assemblage only for the factor of depth (p-value <0.05). In general, bony fish were the most discarded organisms (23.5±14.4%). Cartilaginous fish, crustaceans and other invertebrates represented approximately 13% of the total catch. The fraction of discard in the catch presented significant variation regarding the years, depth and fishing ground. Our results showed that most of the discards in the deep water rose shrimp (DPS) fisheries are due to species that have a minimum legal size (Hake, DPS, Trachurus spp.), and are consequently subjected to the discard ban (art. 15 of the reg. EU 1380/2013). To avoid the landing of discards, specific measures aimed to minimize the unwanted catches of undersized species should be implemented.

scholarly journals Can we infer dredge fishing effort from macrobenthic community structure?

2009 ◽  
Vol 66 (10) ◽  
pp. 2121-2132 ◽  
Author(s):  
M. B. Gaspar ◽  
S. Carvalho ◽  
R. Constantino ◽  
J. Tata-Regala ◽  
J. Cúrdia ◽  
...  
Keyword(s):  
Community Structure ◽  
Trophic Structure ◽  
Species Abundance ◽  
Taxonomic Diversity ◽  
Fishing Effort ◽  
Macrobenthic Community ◽  
Commercial Fishing ◽  
Macrobenthic Communities ◽  
Macrobenthic Community Structure ◽  
Closed Season

Abstract Gaspar, M. B., Carvalho, S., Constantino, R., Tata-Regala, J., Cúrdia, J., and Monteiro, C. C. 2009. Can we infer dredge fishing effort from macrobenthic community structure? – ICES Journal of Marine Science, 66: 2121–2132. The effects of commercial fishing effort (FE) on macrobenthic community structure were analysed in geographically related fishing grounds separated into three groups: non-exploited (NE), moderately exploited (ME), and highly exploited (HE). Number of species, abundance, Margalef species richness, and Shannon–Wiener diversity were significantly higher in NE than in exploited areas. The first two were also significantly higher in HE than in ME areas. Measures of taxonomic diversity differed depending on whether annelids, molluscs, and crustaceans were combined or analysed separately. Crustaceans seemed to be the most vulnerable to bivalve dredging because significantly lower values were observed for them in the HE areas than in the ME and NE areas for this group. Although the samples were taken at the end of the closed season, macrobenthic communities still showed differences that may be related to FE, especially in trophic structure. Carnivory was particularly dominant in HE areas. The ratio of carnivory to filter-feeding was significantly correlated with FE, with higher values being observed in HE areas and lower values in NE areas.

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