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Small-scale capture fisheries condition is multi gear and multispecies has an impact on increasing the pressure of fish condition. The information related to fisheries resource status is very essential in order to build sustainable fisheries management planning. This study aims to analyze the level of fishing gear productivity, clustering of fishing gear based on the number of catch fish in Prigi, East Java. These study results are expected as sustainable small-scale fisheries management recommendations. This research methods were used the analyzed of diversity by Shannon-Wiener index, catch per unit effort (CPUE) and clustering of fishing gear based on a combination between principal component analysis (PCA) and hierarchical cluster. The results showed that the composition of the catch in each fishing gear was varied. The highest diversity of fish used gillnet as fishing gear. In general, the type of fishing gear with the most catches in AFP Prigi is handline, meanwhile scoop net became the highest CPUE of fishing. Clustering of fishing gear tends to be the same with varying proximity and gillnet fishing gear is a fishing gear that tends not to group with other tools. This study resulted that the clustering of fishing gear tends not to change in the last 10 years, however the correlation between groups are dynamic and this case has an impact on the variations of catch fish and fishing gear productivity.

Fringe-scale sardine (Sardinella fimbriata) is one of the dominant species landed in Prigi fishing port. However, in recent years the sardine fishery management might deal with some overfishing indicators of this species . The purpose of this study was to determine the trend of catches, fluctuations in catch per unit effort (CPUE), and the pattern of the fringe-scale fishing season using catch-effort data of purse seine and gillnet landed at PPN Prigi in the period 2011-2020. The results showed that the catch fluctuated every year . CPUE has tended to increase over the last ten years but decreased in 2014 and 2020. The highest CPUE value occurred in 2019 which was 0,21kg/trip. The Peak fishing season occurs in December – March.

A stationary lift net requires an effective fishing light attractor. The intensity and distribution of light are important factors to increase the effectiveness of fishing light attractors. This study aimed to probe the distribution of light intensity and its effect on the effectiveness of fishing light attractors. This research employed a descriptive-comparative method by comparing the effectiveness of LED lights with kerosene lights. The results showed that the concentration of fish school in LED lights was at a depth of 4–10 m with a light intensity of 1x10-8– 10x10-8 W/cm2, while the kerosene lights was deeper than LED lights at a depth of 8–12 meters with a light intensity of 1x10-8– 10x10-8 W/cm2. The distribution of fish schools from LED lights tends to be concentrated and form larger schools than kerosene lights. The optimum light intensity of LED and kerosene lights was almost the same, in the range of 1x10-8– 10x10-8 W/cm2, with concentrations of fish schools reaching 65% and 64%, respectively. The total catch of LED lights fish during eight fishing trips was 168.5 kg or an average of 21.06±2.32 kg/trip, while the total catch of kerosene lights was 139.6 or an average of 17.5±1.98 kg/trip.

Perikanan layang yang didaratkan di Pelabuhan Perikanan Nusantara (PPN) Prigi merupakan perikanan pelagis yang disusun oleh tiga spesies sumber daya ikan layang yaitu layang anggur ( Decapterus kuroides ), layang benggol ( Decapterus ruselli ) dan layang deles ( Decapterus macrosoma ). Aturan kendali tangkap pada perikanan layang kerap menggunakan model konvensional spesies tunggal, meski secara teknis tidak sesuai digunakan pada perikanan layang tercampur yang disusun oleh lebih dari satu spesies (multispesies). Aplikasi feedback harvest control rule ( HCR ) merupakan alternatif aturan kendali tangkap yang tervalidasi yang dapat digunakan untuk perikanan multispesies. Pada penelitian ini dilakukan estimasi jumlah tangkapan yang diperbolehkan ( allowable biological catch /ABC y ) dengan menggunakan dua aturan kendali tangkap yaitu feedback HCR dan model konvensional surplus produksi Schaefer (1954) dengan menggunakan data hasil tangkapan dan upaya penangkapan (trip) dalam kurun waktu 2011 – 2020. Hasil estimasi model Schaefer (1954) menunjukkan ABC y bahwa hanya dapat diestimasi untuk layang anggur, sementara dua spesies layang lainnya, tidak memenuhi asumsi model Schaefer (1954). Penggunaan aplikasi feedback HCR pada ketiga spesies layang lebih praktis karena mampu mengestimasi ABC y tanpa perlu dilakukan pemisahan data hasil tangkapan dan upaya penangkapan berdasarkan spesies.

Cakalang (Katsuwonus pelamis) is one of the leading export commodities landed at the Prigi Fishing Port (PPN Prigi). Skipjack tuna fisheries management conducted the conventional single-species Schaefer model which is often applied although it is not technically suitable for multispecies fishery. The application of feedback harvest control rule (HCR) is an alternative harvest strategy that has been successfully implemented and validated for multispecies fishery. This study estimated allowable biological catch by applying two harvest strategies, HCR feedback and Schaefer surplus production model using catch-effort data of skipjack tuna landed at PPN Prigi in the period 2010 - 2019. Model Schaefer pointed out that catches have exceeded the maximum sustainable yield () even employed low the fishing effort which was under the fishing mortality consistent with achieving MSY (). The application of feedback HCR that has been previously validated can be an alternative of harvest strategy for use in fisheries where only mixed species data is available. Key words: multispecies fishery, harvest strategy, Schaefer model, maximum sustainable yield, single-species approach

Harlyan LI, Badriyah L, Rahman MA, Sutjipto DO, Sari WK. 2021. Harvest control rules of pelagic fisheries in the Bali Strait, Indonesia. Biodiversitas 23: 947-953. Multispecies pelagic fisheries have contributed as the main fishery production for the Bali Strait fisheries. To maintain the sustainability of the fish stock, sets of harvest control rules (HCRs) have been introduced in terms of fishery management. Conventional single-species surplus production models have been used extensively to determine the future annual allowable biological catch (ABC). However, they may not technically apply to multispecies fishery management. The feedback harvest control rule HCR has been validated and applied to maintain the catch variability of the multispecies fishery. This study aims to technically compare the use of the surplus production model and the feedback HCR in the ABC estimation. The catch and effort data series of the three dominant species from 2010-2019, collected from Pengambengan and Muncar fishing port, were analyzed by two HCRs, the Schaefer surplus production model and the feedback HCR to obtain the ABC. As a result, the Schaefer model showed a higher estimation of ABC than the feedback HCR because the feedback HCR may reflect the recent historical catch consistent with precautionary principles. The feedback HCR showed an initial step toward sustainably managing multispecies fisheries while dealing with unavailability in species-specific data conditions.

Perubahan garis pantai merupakan salah satu bentuk dinamisasi pada kawasan pantai yang dapat terjadi secara terus menerus. Faktor penyebab terjadinya perubahan garis pantai dapat diakibatkan oleh adanya abrasi dan akresi. Faktor hidro – oseanografi yang juga mempengaruhi perubahan garis pantai yaitu gelombang dan pasang surut air laut. Secara umum, penyebab terjadinya gelombang laut yang dominan yaitu diakibatkan oleh faktor aingin. Tujuan dari penelitian ini adalah untuk mengetahui perubahan garis pantai serta hubungan antara perubahan garis pantai dengan pasang surut dan gelombang laut yang terjadi di Pantai Gampong Lhok, Aceh. Metode yang digunakan dalam penelitian ini yaitu metode thresholding untuk memisahkan antara daratan dengan lautan dan pengaplikasian Digital Shoreline Analysis System (DSAS). Hasil penelitian yang didapatkan yaitu pada tahun 2016 – 2020 kawasan pesisir Pantai Gampong Lhok mengalami akresi maksimum sebesar 30,16 m/tahun, sedangkan abrasi maksimum terjadi sebesar -34,49 m/tahun. Hasil penelitian ini dapat digunakan sebagai penelitian awal dalam pembuatan kebijakan oleh pemerintah untuk kawasan pesisir Pantai Gampong Lhok.

Skipjack tuna (Katsuwonus pelamis) is one of high economic valued pelagic fish on the south coast of Malang waters. This fish is usually caught by purse seine. This study was conducted at Sendang Biru Coastal Fishing Port Malang Regency from February to May 2021, aiming to find out the utilization rate and bioeconomic conditions of the skipjack tuna fishery. The study used descriptive methods. Statistical data on catches from 2011 to 2020 were used to apply bioeconomic analysis to calculate the maximum sustainable yield (MSY), maximum economic yield (MEY), total allowable catch (TAC), and free access equilibrium (FAE). Results showed that values of catch and effort at MSY level were 1,800 tons and 3,191 trips respectively with a value of TAC as much as 1,440 tons. While values of catch and effort at MEY reached 1,774 tons and 2,814 trips respectively with the highest profit obtained as much as IDR 34.12 billion. In addition, catch and effort at FAE level took place at 751 tons and 5,627 trips respectively. The utilization rate of skipjack tuna (K. pelamis) was 123%. In conclusion, the fish is in over-exploited condition hence the amount of effort must be decreased to maintain resources sustainability.

Kondisi perikanan tangkap skala kecil yang bersifat multigear dan multispecies menyebabkan meningkatnya tekanan terhadap kondisi sumberdaya ikan. Informasi mengenai status sumberdaya ikan yang ada sangat diperlukan untuk perencanaan pengelolaan perikanan yang berkelanjutan. Penelitian ini bertujuan untuk mengkaji diversitas hasil tangkapan, tingkat pemanfaatan sumberdaya ikan, serta pengelompokkan alat tangkap di PPN Prigi. Data diperoleh dari statistik perikanan PPN Prigi periode 2010-2014. Hasil penelitian menunjukkan bahwa rata-rata indek keragaman hasil tangkapan paling besar adalah pancing ulur yaitu 1,64. Secara umum nilai CPUE menurun setiap tahunnya dengan rata-rata CPUE tertinggi adalah jaring insang yaitu 0,30 ton/trip/tahun. Sedangkan pengelompokkan alat tangkap yang sering terjadi yaitu antara pancing ulur dengan jaring klitik. Kondisi tersebut dipengaruhi oleh tingkat keragaman hasil tangkapan masing-masing alat tangkap tinggi. Most of small-scale fisheries are multispecies and multi gear so that small-scale fisheries management is very complex. However, information on small-scale fisheries is scarce. Therefore, information on small-scale fisheries is indispensable for sustainable fisheries management planning. This study aims to describe the condition of small-scale fisheries, primarily examine the diversity of the catch, the level of utilization of fish resources, and the grouping of fishing gear in Prigi Fishing Port. Data were analyzed from fisheries statistic data of Prigi fishing port during 2010-2014. The result of this study showed that the greatest diversity of fishing gear ctches occured in handlines is 1,64. In generally, the CPUE deccline annualy by an average of the highest CPUE is a gillnets of 0.30 ton/trip/year. On the other hand, the results of PCA analysis shows that in general, hand lines is often grouped with monofilament gillnet (klitik). The grouping was expected caused by the similarities of target catches between of the fishing gears.