Abstract The El Nino Southern Oscillation (ENSO) phenomenon causes changes in environmental conditions such as water temperature, salinity, and rainfall. In fisheries sector, the changing environment has affected the fishing seasons and Catch per Unit Effort (CPUE) of some pelagic species. This research was conducted by calculating CPUE and fishing season index for several small pelagic fishes in Makassar Strait, Bali Strait, and Aceh waters, then comparing the index value with the fishing season pattern in two extreme periods that are 2010-2011 and 2016 - 2017. An ANOVA test was conducted to assess the significant difference between normal and extreme conditions. The results of the analysis showed that there was a significant different in CPUE between average normal condition and ENSO period. Every single species showed different response to ENSO event, mostly decreased in CPUE relate to El Nino event, except for sardine in Bali and Makassar Strait and scad in Makassar Strait. ENSO affects shift in the fishing season of big-eye scad, scad, sardine, and neritic tuna in Makassar Strait, Bali Strait, and around Aceh waters. Indian mackerel in Makassar Strait showed no change in fishing season but the CPUE showed lower than normal condition. This study shows that ENSO was significantly affected fisheries in Indonesia waters.
Dalam kegiatan budi daya udang vannemei selalu terjadi proses terlepasnya udang ke perairan. Sebagai spesies baru yang masuk ke perairan Indonesia udang vanammei perlu dikaji keberadaan. Penelitian ini bertujuan untuk mempelajari dan kelimpahan keberadaan udang vannamei yang terlepas dari tambak ke perairan laut. Hasil penelitian menunjukkan bahwa udang vannamei ditemukan di perairan Teluk Pangpang Banyuwangi. Udang vannamei tertangkap oleh alat tangkap sero, seser, dan jala pada jarak kurang lebih 500 m dari garis pantai pada kedalaman kurang dari 1 m dengan dasar perairan berlumpur. Kelimpahan udang vannamei pada bulan Oktober lebih tinggi dibandingkan bulan Juli. Ukuran udang yang tertangkap pada bulan Oktober lebih kecil dibandingkan dengan udang yang tertangkap pada bulan Juli. In the vannamei culture processes, there are always some vannamei escapes to the sea. As a non indigenous species in Indonesia waters, the vannamei escape should be assessed. The purpose of this research is to study the present and abundance of the vannamei escape from pond or hatchery to the sea. Research results show that vannamei are found in the Pangpang Bay Banyuwangi near by the coastal around 500 m from coastal line down to a depth of approximately 1 m in the muddy bottom substrate. Vannamei are caught by trap net (sero, jala, and seser). The abundant of vannamei caught was in higher October are higher than July but the vannemei size was bigger in July than that in October.
Jaring bouke ami merupakan alat tangkap yang diklasifikasikan sebagai jaring angkat (lift Net) dengan target tangkapan cumi-cumi. Cirebon merupakan salah satu tempat pendaratan ikan yang didominasi kapal bouke ami. Penelitian model produksi dan laju tangkap kapal bouke ami yang berbasis di PPN Kejawanan Cirebon dilakukan pada bulan Juni dan Agustus 2011. Tujuan penelitian adalah untuk mengetahui hasil tangkapan, model dan faktor-faktor yang mempengaruhi hasil tangkapan serta laju tangkap kapal bouke ami. Analisis model produksi yang digunakan adalah model Cobb Douglas. Data yang dikumpulkan meliputi data spesifikasi kapal, produksi per jenis ikan, jumlah kapal dan total tangkapan. Hasil penelitian menunjukkan bahwa hasil tangkapan utama dari jaring bouke ami adalah cumi-cumi, dengan komposisi hasil tangkapan rata-rata sebesar 60,51% dari total hasil tangkapan. Analisis model produksi menunjukkan bahwa variable ukuran kapal (GT) berpengaruh secara signifikan (P F tabel =2,073) dan nilai koefisien determinasi (R 2 ) sebesar 0,53. Rata-rata laju tangkap jaring bouke ami tahun 2006-2010 adalah sebesar 6,72 ton/trip dengan laju tangkap cumi-cumi sebesar 3.907,5 kg/trip atau sebesar 58,5% dari total laju tangkap. Stick held dip net , classified as lift net is one of fishing gears used to catch squid as target species. Cirebon is one of fishing port for stick held dip net. The n umber of stick held dip net landed at Kejawanan Fishing Port is dominant . A study aimed to reveal information about catch, production factors that affecting the catch and catch rate of stick held dip net has been conducted in June and August 2011. Vessel specification, production by species and the number of vessel data were collected. Production model of the stick held dip net was analysed using Cobb Douglas model. The results showed that catch composition was dominated by squids with an average catch of squid reached up to 60,51% of the total catch. The model production showed that the variable size of the vessel (GT ) was significantly affected the catch (P F table =2,073, R 2 =0,53. An average catch rate of stick held dip net in the period 2006-2010 was 6,72 ton/trip with an average catch rate of squid was 3.907,5 kg/trip or 58,5% from the total catch rate.
<p>Kearifan lokal merupakan suatu nilai budaya yang tidak terlepas dari kehidupan masyarakat Indonesia dan diakui keberadaannya oleh hukum negara. Kearifan lokal yang masih berlakudi dalam kehidupan masyarakat Sumatera terkait dengan pengelolaan perikanan perairan umum daratan terdiri dari lelang lebak lebung (Sumatera Selatan), lubuk larangan (Jambi dan Sumatera Barat), rantau larangan (Riau), ma’uwo (Riau), dan upacara semah terubuk (Riau).Dari kelima kearifan lokal tersebut, lubuk larangan termasuk sistem pengelolaannya sudah menjadi salah satu kegiatan pemerintah sampai di tingkat nasional.Penguatan kearifan lokal dengan kajian ilmiah dapat menjadikan kearifan lokal sebagai bagian dari sistem pengelolaan perikanan yang efektif dan efisien berbasis masyarakat.Kajian ilmiah terhadap kearifan lokal yang berhubungan dengan pengelolaan perikanan dapat didekati dengan etnobiologi (analisis emik dan analisis etik).Selanjutnya, kearifan lokal dapat diperkuat secara hukum dan perundang-undangan yang berlaku secara nasional.</p><p><em>Local wisdom is a cultural value that can not be separated from the life of the Indonesian people and its existence is recognized by state law. Local wisdoms found in Sumatra related to inland fisheries management are lebak lebung (South Sumatra), lubuk larangan (Jambi and West Sumatra), rantau larangan (Riau), ma'uwo (Riau), and upacara semah terubuk (Riau).Lubuk larangan including its management system has become one of the government's activities to the national level. Strengthening local wisdom with scientific studies can make it is as part of effective and efficient community-based fisheries management system. Scientific studies on local wisdom related to fisheries management could be analyzed by applying ethnobiology approach (emic and etic analysis).</em></p>
Zooplankton is the main prey of fish larvae. The match between fish larvae and its prey depends on the size and the composition of zooplankton. The study aims to investigate the biomass and species composition of zooplankton and their relationship to the environmental conditions in Pulau Pari Lagoon. Research was conducted from June to November 2010. Results showed that 63,9% of zooplankton biomass consisted of microzooplankton, dominated by the class of Crustacea with subclass of Copepoda, and 36,1% of zooplankton biomass consisted of mesozooplankton, dominated by the class of Crustaceasu with subclass of Malacostraca. The biomass peak occurred at the end of July indicating the highest food availability and this could support fish larve survival.
The grouper species holds considerable potential for aquaculture due to its high value. The significant challenge of high mortality rates among groupers is addressed by utilizing buoy devices for water quality monitoring. Technical issues with buoys frequently result in data loss, impacting the dataset. Machine learning techniques, particularly transfer learning, are being explored as a potential solution to address the challenges posed by limited datasets. The objective of this study is to create a fish mortality prediction model by utilizing transfer learning from the Habs event model in Lampung in situations where data is limited. Observational discrepancies exist in the distribution patterns of fish mortality across different study parameters. This observation implies that certain parameters, such as current, salinity, conductivity, chlorophyll, and turbidity, have a notable impact on the risk of fish mortality. The transfer learning model with fine-tuning has achieved excellent results in model evaluation metrics, such as area under curve (AUC) (94.545%) and mean squared error (MSE) (0.1108). The proposed model demonstrates superior performance compared to deep learning without transfer learning and transfer learning model without fine-tuning.
Abstract The sardine fishery in Bali is influenced by fishing effort and environmental conditions including temperature and chlorophyll a (chl‐a). Bali's sardine, Sardinella lemuru Bleeker, production decreased significantly during the extreme conditions that occurred in 2010 and 2016. This study assesses the impact of extreme conditions on the sardine fishery of the Bali Strait. Fisheries data were collected from two landing places: Muncar fishing port (Banyuwangi District, East Java Province) and Pengambengan fishing port (Jembrana District, Bali Province) between January 2007 and December 2017. Temperature and chl‐a data were downloaded from satellite readings. Fishing locations were observed by an onboard observer to investigate shifts in fishing grounds. A modified Cobb–Douglas regression model and profile analyses were used to estimate the impact of environmental variables on sardine production and to assess how extreme periods affect the catch composition in the Bali Strait. Seawater temperature and chl‐a concentration had significant impacts on sardine production, but temperature is likely to be less correlated with sardine production than chl‐a concentration. To adapt to extreme weather, purse seiners prefer to modify the vessel type rather than change their fishing ground.
Cumi-cumi merupakan hasil tangkapan sampingan bagi sektor perikanan di Laut Jawa, namun memiliki nilai ekonomi cukup penting. Pengamatan ini bertujuan untuk mengetahui aspek biologi cumi-cumi mencakup komposisi jenis, morfometrik, rasio kelamin dan tingkat kematangan gonad yang tertangkap di perairan utara Jawa di sekitar periaran Rembang, Cirebon dan Belanakan Subang. Ada empat jenis cumi-cumi ditemukan dalam pengamatan ini yaitu Loligo duvauceli sebagai jenis dominan, disusul oleh L. edulis, L. chinensis dan L. singhalensis. Hubungan panjang mantel dan berat jenis L. duvauceli menunjukkan nilai koefisien pertumbuhan b sebesar 2,003 untuk jantan dan 1,942 untuk betina. Hasil tangkapan individu jantan pada bulan Juni dan Oktober lebih tinggi. Pengamatan tingkat kematangan gonad menunjukkan bahwa cumi-cumi memijah sepanjang tahun. Karakteristik biologi cumi-cumi di perairan Rembang tidak berbeda nyata dengan cumi-cumi di perairan Cirebon dan Subang, serta memiliki karakteristik yang sama dengan cumi-cumi yang tertangkap di Selat Alas dan perairan India, kecuali waktu puncak pemijahan yang lebih lambat di perairan Rembang dan Cirebon dibandingkan dengan di lokasi lainnya.Squid are not the main target of cath fiesheries in the Java Sea, but it has high economic value. The aim of this observation is to study the biological aspect of squid, such as species composition, morfometric, sex rasio and maturity which were caught in Rembang, Cirebon and Subang. There are four species of squid were recorded during sampling dominated by Loligo duvauceli while the others were L. edulis, L. chinensis and L. singhalensis. The Length-weight relatioship of L.duvauceli showed that the growth coeffiicient were 2,003 and 1,942 for male and female respectively. Male were found common in June and October compare to female. Squid were spawned all over the year. There were no significant differences among squid caught in the waters around Rembang, Cirebon and Subang, and it seems also the same biological characters with squid in Alas Strait Nusa Tenggara Barat (NTB) and Indian waters, but the peak of spawning season in Rembang and Cirebon was late than others.
With 17,504 islands, 108,000 kilometers of coastline, and three-quarters of its territory at sea, Indonesia's prosperity is deeply entwined with its oceans. Yet the future for Indonesia's oceans, like those worldwide, is increasingly uncertain. Climate change is driving increases in water temperatures, storm severity, and sea level rise, causing shifts in coastal ecosystems and fisheries. These trends pose challenges for Indonesia's ocean economy and the people it supports. Indonesia's fisheries are at the center of these challenges. The fisheries sector contributes US26.9 billion dollars annually to the national economy (around 2.6 percent of GDP), 50 percent of the country's protein, and over 7 million jobs (World Bank 2021). The impact of climate change on the fisheries sector will thus have important implications for livelihoods, food security, and economic growth. While this is true around the world, few countries have fishery resources as vast as Indonesia's or depend as much as Indonesia does on fisheries for jobs and protein. As this report highlights, the importance of ensuring productive and sustainable fisheries in the face of a changing climate is well-recognized. The Government of Indonesia is taking steps toward a climate-resilient marine and coastal economy through investment in infrastructure, technology, capacity-building, and governance. Strategies and actions are outlined in the Enhanced Nationally Determined Contribution (NDC), the Climate Resilient Development Policy 2020- 2045, and the List of Priority Locations and Climate Resilient Actions prepared by the Ministry of National Development Planning (Bappenas). Climate resilience is being prioritized by the Ministry of Marine Affairs and Fisheries (MMAF).
Penelitian ini dilakukan pada bulan April dan Oktober 2011 dengan tujuan untuk mendeskripsikan perikanan cumi-cumi (Loligo spp.) yang meliputi produksi, musim penangkapan dan komposisi jenis cumi-cumi. Data yang dihimpun meliputi data produksi perjenis hasil tangkapan dan trip penangkapan kapal pukat cincin tahun 1996-2011. Data dianalisis menggunakan analisis runtun waktu. Hasil penelitian menunjukkan bahwa komposisi cumi-cumi di Rembang tahun 2005-2009 sebesar 27,36% dari produksi Jawa Tengah dan hanya sekitar 2,91% dari produksi di perairan utara Jawa. Selama periode 1996-2011, produksi tahun 2002 merupakan produksi tertinggi dan produksi tahun 1996 merupakan produksi terendah, sedangkan rata-rata produksi bulanan, tertinggi pada bulan Juni dan produksi terendah pada bulan Januari-Februari. Musim penangkapan cumi-cumi di Rembang terjadi pada bulan Maret sampai Mei, dan November. Jenis cumi-cumi yang didaratkan di Rembang adalah jenis Loligo chinensis, Loligo singhalensis, Loligo edulis dan Loligo duvaucelli, dimana L. duvaucelli merupakan jenis yang paling dominan. The research was conducted in April and October 2011, to investigate the production, fishing seasons and composition of squids (Loligo spp). Data of production by effort (trip) and species composition of purse seine was collected. The data were analyzed using time series analysis. The results showed that the squid production in Rembang was 27.36% of the total production in Central Java and was 2,91% of production in the northern waters of Java (2005-2009). During the period of 1996-2011, the highest squids production occurred in 2002 and the lowest production occurred in 1996. The average monthly production of the squids was highest in June and was lowest in January- February. The Squid fishing season occurs in March-May, and November. There were four species of squids in the catch i,e. Loligo chinensis, Loligo singhalensis, Loligo edulis and Loligo duvaucelli. Among them L. duvaucelli is the dominant species.
