Seine Operations Research Articles

The Effect of Innovation Portable FADs on Purse Seine Operations in Tegal Regency Waters

The Effect of Innovation Portable FADs on Purse Seine Operations in Tegal Regency Waters

Unmanned surface vehicle (USV) with a fish attraction lamp to assist the purse seine operations

Unmanned surface vehicle (USV) with a fish attraction lamp to assist the purse seine operations

Analysis of Purse Seine Vessel Operations Based at PPI Dufa-Dufa

Fisheries activities in Ternate City are developing well, this is supported by the operation of the Fish Landing Base (PPI) and the Ternate Nusantara Fishing Port. Information on effective fishing units and operations that have high productivity is important in the development of capture fisheries in PPI Dufa-Dufa, so that purse seine fisheries in PPI Dufa-Dufa is expected to be profitable and sustainable, therefore research on purse seine vessel operations needs to be done by considering all related aspects. The research took place from June to August 2014 at PPI Dufa-Dufa Ternate City by using descriptive analysis and effectiveness and efficiency analysis using scoring method to determine the level of effectiveness and efficiency analysis of purse seine vessel operational activities. The results of the study found that larger vessels (GT more than 20) have higher effectiveness and efficiency values than small vessels (GT less than 20). Purse seine operations at PPI Dufa-Dufa still allow for the development of operational activities, namely the development of new areas for fishing, improving fishing technology and increasing the quality value of catches in the form of training in handling catches

Handling and Composition of Purse Seine Catches at Fishing Port, Batam City

Handling fish on board must be carried out properly to maintain the quality of the fish obtained. This study analyzed the handling process and composition of catches on purse seine vessels unloaded at the Fishing Port, Batam City. Handling of catches on purse seine vessels is carried out in the following stages, namely loading fish onto the ship, washing fish, sorting fish, washing fish before entering the Air Blasting Freezer (ABF) room, freezing using Air Blasting Freezer (ABF), packaging, and storage in cold storage rooms. The catch on trip 1st, with fishing operations from March 21st to April 15th 2022, resulted in a catch of 36,308 kg, with the following percentage of dominant catch composition, namely Indian scad of 78.61%, Bigeye scad of 7 .52%, Shrimp scad of 3.41%, Yellowtail scad of 3.05%, and Indian mackerel of 2.63%. The catch on trip 2nd, during the fishing operation period, from April 21st to May 13th, 2022, is presented in Table 2. The catch consisted of target and non-target species, with a total weight of 21,386 kg. The catch was dominated by Indian scad of 80.47%, Bigeye scad of 5.81%, Goldstripe sardinella of 5.29%, Bullet tuna of 2.63%, and Squid of 2.14%. Indian scad is the dominant species caught in the purse seine operation.

The Study of Fishing Vessel Behavior Identification Based on AIS Data: A Case Study of the East China Sea

The goal of this paper is to strengthen the supervision of fishing behavior in the East China Sea and effectively ensure the sustainable development of fishery resources. Based on AIS data, this paper analyzes three types of fishing boats (purse seine operation, gill net operation and trawl operation) and uses the cubic spline interpolation algorithm to optimize the ship trajectory and construct high-dimensional features. It proposes a new coding method for fishing boat trajectory sequences. This method uses the Geohash algorithm to divide the East China Sea into grids and generate corresponding numbers. Then, the ship trajectory is mapped to the grid, the fishing boat trajectory points are associated with the divided grid, and the ship trajectory ID is extracted from the corresponding grid. The extracted complete trajectory sequence passes through the CBOW (continuous bag of words) model, and the correlation of trajectory points is fully learned. Finally, the fishing boat trajectory is converted from coordinate sequence to trajectory vector, and the processed trajectory sequence is trained by the LightGBM algorithm. In order to obtain the optimal classification effect, the optimal superparameter combination is selected. We put forward a LightGBM algorithm based on the Bayesian optimization algorithm, and obtained the classification results of three kinds of fishing boats. The final result was evaluated using the F1_score. Experimental results show that the F1_score trained with the proposed trajectory vectorization method is the highest, with a training accuracy of 0.925. Compared to XgBoost and CatBoost, the F1_score increased by 1.8% and 1.2%, respectively. The results show that this algorithm demonstrates strong applicability and effectiveness in fishery area evaluations and is significant for strengthening fishery resource management.

CALCULATION OF PURSE LINE DRAWING TIME WITH SHIP CAPACITY 30-50 GT AT NORTH ACEH

The main problem with purse seine operations is the erratic purse line pull time. This greatly affects the total catch obtained in each trip. Therefore, this study aims to analyze the correlation value of purse line pull time and total catch, then analyze the effect between the two. The research method used is experimental fishing for 3 months. The implementation time was carried out in March-June 2020. The data analysis used was correlation analysis, ANOVA and regression. The correlation value (r) between purse line pulling time and total catch is 0.72 (strong). Based on the ANOVA value, which resulted in significantly different values, the purse line pull time significantly affected the total catch. The purse line pull time factor affects the total catch by 52% and 48% is influenced by other factors. The linear regression equation is y = 6261.2 - 2.3102x. The value of constant b has a negative value, so each additional purse line pull time will reduce the total catch. The results of this study can be used as the basis for the development of purse seine puller technology to improve the effectiveness and efficiency of purse seine operations.

PRODUKTIVITAS DAN MUSIM PENANGKAPAN IKAN DOMINAN MENGGUNAKAN PURSE SEINE DI PELABUHAN PERIKANAN PANTAI TAMPERAN, PACITAN

Purse seine fishing significantly contribute to fish production at Tamperan fishing port, Pacitan. However decreasing production trend is threatening as a result of overfishing and poor information about fishing seasonal patterns. Purse seine at Tamperan port mostly catch highly valued pelagic fish. Those fish are popular in the region and caught its respective seasonal patterns. The research aims at calculating the fishing productivity and identifying the seasonal pattern of the major targeted species of purse seine based at the Tamperan fishing Port, Pacitan. The research was conducted by interviewing 18 fishers, head of fish auction center and some offers of Tamperan fishing port. Data collection incorporated catch production, types of fish, fishing trips and other data. Productivity was calculated according to KEPMEN N0.61/2014 while fish season patterns were projected using time series and moving average methods. During the last 5 years the fish production landed at PPP Tamperan were skipjack, mackerel scad, and tuna. The number of productions decreased as well as the level of productivity. Factors affecting productivity included the number of crew members, fishing trips, gross tonnage, engine, and net length. Purse seine productivity based on the number of fishing trips (ton/trip) has increased while others have decreased. According to the fish seasons, the best period to conduct purse seine operations in Pacitan Regency are in March, May-September (skipjack), December-February, April-May (mackerel scad), and January-April, July, August (tuna).
 Keywords: Purse seine, productivity, dominant fishing season, Pacitan.

SPECIFICATIONS AND OPERATIONS PURSE SEINE IN KM KARYA MAJU DISTRICT SIBOLGA

Fish landing activities in Sibolga Fishing Port are dominated by small pelagic fish, used purse seine. Purse seine is one of the most widely used fishing gear in Sibolga. The reason for the large number of fishing gears is because this fishing gear is considered to be quite effective in use and also the availability of potential to support it in carrying out its operation. Fishing using purse seine is one of the fishing methods aimed at large schools of pelagic fish. The purpose of this study was to determine the specifications of the purse seine at KM Karya Maju and to determine the method of operation of the purse seine at KM Karya Maju. The research was carried out March-April 2019 at KM Karya Maju. The purse seine specifications at KM Karya Maju consist of upper rope, lower rope, buoys, ballast rope, self edge, ring rope, ropes, buoys, sinkers, rings. The purse seine operation area is located at WPP 572, from Nias island to North Natuna. Purse seine at KM Karya Maju is operated at night, using FADs. The principle of operation of KM Karya Maju's purse seine is by circling a group of fish into a pocket- shaped net.
 
 Keywords: KM Karya Maju, Operation, PPN Sibolga, Purse seine, Specification

Balık morfolojisine göre gırgır boylama eleğinin alıkoyma olasılığı

The retention-releasing patterns of the double-grid grating sieve placed on the deck of the purse seiners were revealed for four case species (Sardina pilchardus, Sardinella aurita, Engraulis encrasicolus and Boops boops) using a simulated data predicted from total length (TL) – maximum height (Hmax) and TL – maximum width (Wmax) regressions. To calculate these relationships, samples were collected during commercial purse seine operations between 3 April 2017 and 21 March 2018 in Izmir Bay, Aegean Sea (Turkey). Optimal Bar Spacing (OBS) values corresponding to minimum landing sizes or the length at first maturity were calculated separately for each species. OBS values were found 10.97 mm for sardine (Sardina pilchardus), 11.29 mm for round sardine (Sardinella aurita), 7.78 mm for anchovy (Engraulis encrasicolus) and 17.89 mm for bogue (Boops boops). The bar spacing regulations may constitute a promising management measure to release undersized fish for the purse seine fishery in the Aegean Sea.

Spatial Analysis of the Fishing Behaviour of Tuna Purse Seiners in the Western and Central Pacific Based on Vessel Trajectory Data

The Western and Central Pacific Oceans are the primary operational areas of tuna purse seiners worldwide. Describing and analysing the fishing behaviour of vessels is highly significant for the protection of sustainable tuna resources. This study uses Automatic Identification System (AIS) data of 130 tuna purse seiners from July 2017 to May 2018 and uses data mining methods to identify the operating status of tuna purse seiners; describes the spatial characteristics of fishing intensity and the distribution of hot spots; and analyses vessel spatial characteristics to describe their fishing behaviour. The results show that the tuna purse seiner speed has a marked bimodal distribution, which corresponds to high-speed transiting and low-speed seine operation. Additionally, from July to September 2017, the amount of fishing effort invested by tuna purse seiners was lower than that in other months. The tuna purse seiner activity range includes 120° E–60° W, 30° S–30° N, and the activities for fish and seine operations are primarily concentrated at 140° E–150° W, 15° S–15° N. There are differences between the space for fishing search operations and space where fishing events took place in each month. Spatial analysis shows that the high-speed transiting fishing effort map covers a large area, while seine fishing covers a small area. The global spatial autocorrelation analysis shows that the fishing effort devoted to searching for fish stocks has a spatial distribution pattern of aggregation and close aggregation. The results of a hot-spot analysis show that the hot spots on a heat map for finding fish, which are closely spatially clustered, correspond to vessels searching for fish concentration areas and seine operation areas. Correlation testing shows that under a 5° × 5° grid, there is a high positive correlation between the fishing effort invested in finding fish stocks and the yield data, nets (r > 0.8), and a moderate correlation with catch per unit of effort(CPUE) (r > 0.3). Based on vessel behaviour, the location of the fish school can be directly determined, and the distribution of fish clusters and fishing grounds can be predicted. This study can aid in managing tuna purse seiners in the Western and Central Pacific Oceans and analysing changes in fishery resources.

An Adapted Slipping Process to Exclude Jellyfish in the Sea of Marmara Purse Seine Fishery

Excluding the jellyfish from the bunt-end is a common slipping process used in the Sea of Marmara purse seine fishery. For this aim, a sheet of netting piece, larger mesh size and thicker diameter, is rigged on the bunt-end of the purse seine net. The jellyfish mass on the netting piece are slipped by rolling over the headline (floating line) after partially hauling or drying-up the net while it is still in the water. In this study, the catch amount of this slipping was roughly estimated with the introduction of the slipping process only used by the purse seiners in the Sea of Marmara. There were eight successful purse seine operations conducted between 8 and 11 September 2018 in depth ranged 77 to 677 m. The percentage of landed species versus to jellyfish varied between 23% and 85%. The mean landed anchovy amount is 4379 (3756.6) kg for per operation. The mean slipped amount of jellyfish is 3812.5 (2404.4) kg. However, both anchovy (99.8%) and jellyfish (96.3%) are the vast majority species that landed and slipped, respectively. In the operations totally 100 boxes of anchovy (1180 kg) unintentionally was slipped with the jellyfish. In addition, two sharks with larger size were slipped to the sea as alive over the floating line of the net. Although slipping practised rarely in Turkey, all the purse seiner in the Sea of Marmara have to use the adapted slipped process to get rid of jellyfish. However, there are no records and scientific findings regarding slipped amount of the jellyfish. For this reason, this study is important to presented preliminary results regarding amount of the jellyfish. In conclusion, this study is extended completely the Sea of Marmara practised to understand the dimensions of jellyfish amount and slipping process.

Characterization of Beach Seine Operations in Pangandaran Beach, Indonesia

The coastal area in Pangandaran Regency, in general, has been developed as an area for tourism conservation and fisheries activities. Pangandaran beach which facing the oceans has potential in the fisheries sector which is quite potential so that Pangandaran regency is one of the regions in Indonesia that has potential in capture fisheries. There are various types of fishing gear used in fishing activities in Pangandaran, one of them is beach seine. Beach seine is local wisdom that is still maintained in Pangandaran so that this fishing gear is still operated. The purpose of this research is to investigate the operation of beach seine in Pangandaran water. The research was carried out in August 2018 on the East Coast of Pangandaran. The method used in this research is a survey method and analyzed descriptively. The beach seine operation phase is divided into three stages, preparation, stocking nets, and catching catches. The main catches of beach seine in Pangandaran consist of hairtail fish (Trichiurus spp) with an average of 172 fish and white pomfret (Pampus argentus) with an average of 99 fish. The bycatch is 7 species of fish with a total average of 1990 fish. The beach seine in Pangandaran has an average catch rate of 31.05 km/hour.

Fish species difference around the light of metal halide lamps and LED lamps with mini purse seine operation

Purse seine (PS) at Lamongan District Indonesia uses lights as a fish attractor. The types of lamp used are a metal halide (MH). This lamp is very bright but has a large electric power so that fuel consumption is also high. Therefore, it is necessary to do research about the use of an LED lamp that is more energy efficient. This study aims to determine the fish species that are in the vicinity of MH lamps compared to LED lamps based on its swimming layer. The study used the experimental method to obtain catch data from both lamp types, and descriptive method to identify fish species composition. The present study found 16 species coming to both types of lamps. It indicates that the LED lamp as a new lamp can attract the same fish species as a MH lamp. The fish species attracted to both light types of lights were dominated by pelagic fish (88.77% and 81.71%) consisting of small pelagic (7 species) and large pelagic fish (4 species), 4 species of demersal fish (7.81% and 13.26%) and 1 species squid of non-fish (3.42% and 5.03%). Small pelagic fish species are plankton feeder and positive phototaxis fish, while big pelagic fish are carnivorous fish that come for much small fish. Demersal fish also caught in the purse seine are those rising to the upper water column at night.

Spatial and temporal distribution of mobulid ray species in the eastern Pacific Ocean ascertained from observer data from the tropical tuna purse-seine fishery

This research focuses on the description of the spatial and temporal distributions of mobulid ray species (Mobula birostris, Mobula mobular, Mobula thurstoni, Mobula tarapacana and Mobula munkiana) using data from the observer program (1993–2014) of the Inter-American Tropical Tuna Commission (IATTC). The tuna purse seine operations in the region extend from 70 to 150°W to 20°S-30°N. Significant differences on the captures per sets between fishing modes and species were found. Results showed that the most common species taken are M. thurstoni, M. mobular and M. birostris in School sets (sets on unassociated tuna schools). The temporal distributions showed high variability of the catches by species and years. The spatial distribution showed several areas of importance depending of the type of fishing, such as the coast of Peru, Galagapos or the Costa Rica Dome, and possible relationships with some oceanographic processes of the eastern Pacific Ocean (i.e. coastal and seasonal upwelling systems). The frequency of the captures per set showed that, although the greatest numbers caught in a set were very low (around 53.7% of sets with one capture), in some areas and periods there were captures of aggregates of hundreds of individuals of some of these species, such as Galapagos Islands during December, Costa Rica Dome during August, or Baja California during June. These events are of biological interest, and may offer good opportunities for conservation. This project has been developed with the aim of identifying the most important areas for these bycatch species and thus, improving the knowledge on them to reduce their mortality.

Properly designed effort management for highly fluctuating small pelagic fish populations: a case study in a purse seine fishery targeting chub mackerel

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 617-618:265-276 (2019) - DOI: https://doi.org/10.3354/meps12688 Properly designed effort management for highly fluctuating small pelagic fish populations: a case study in a purse seine fishery targeting chub mackerel Momoko Ichinokawa*, Hiroshi Okamura National Research Institute of Fisheries Science, Fisheries Research Agency, 2-12-4 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236-8648, Japan *Corresponding author: ichimomo@fra.affrc.go.jpAdvance View was available online September 6, 2018 ABSTRACT: Proper fisheries management is difficult in fisheries targeting small pelagic fish that are subject to climate-induced oceanic regime shifts. A favourable regime tends to induce capacity investments, but the results of these investments turn out to be irreducible overcapacity under the next unfavourable regime. The Japanese purse seine fishery studied here, which targets small pelagic fish, is a typical example of such overcapacity. However, we demonstrate that this fishery represents a best practice of properly designed effort management in recent years through its quantitative evaluation. Generalized linear mixed models (GLMMs) applied to daily logbook data revealed that effort restrictions on daily purse seine operations (in terms of the duration and the total number of operations per ship and day) significantly reduced total fishing efforts on chub mackerel. Stochastic simulations based on the parameters estimated in GLMMs quantified the extent of the potential catch reduction by the effort reductions at approximately 20%. Combined with the effect of another concurrently implemented management measure, i.e. day closures, the net effects of the effort management on the total catch reduction were estimated at 30%. Because the quota uptake percentages in this fishery were 60-80% during the study period, we conclude that the effort management helped avoid overshooting of the quota and consequent seasonal closures. KEY WORDS: Input control · Effort limitations · Race to fish · Catch shares Full text in pdf format Supplementary material PreviousNextCite this article as: Ichinokawa M, Okamura H (2019) Properly designed effort management for highly fluctuating small pelagic fish populations: a case study in a purse seine fishery targeting chub mackerel. Mar Ecol Prog Ser 617-618:265-276. https://doi.org/10.3354/meps12688 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 617-618. Online publication date: May 16, 2019 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2019 Inter-Research.

Record of ocellated shrimp goby, Tomiyamichthys russus (Actinopterygii: Perciformes: Gobiidae), from the Andaman Islands, India

The ocellated shrimp goby, Tomiyamichthys russus (Cantor, 1849), is reported for the first time from the Andaman Islands, India based on a single, female specimen collected during a shore seine operation at Port Blair, South Andaman. The examined specimen is described taking into account the meristics, morphometry, sensory pore arrangement, and the papillae pattern. This finding constitutes the first report of the genus Tomiyamichthys from the Andaman Sea, with a range extension towards Andaman coast. Plain.

Investigations on purse seine operations off central Kerala during late 1990s and recent technological changes

Purse seining is one of the important fishing methods for pelagic fishery resources. The results of investigations on mechanised purse seine operations during late 1990s off central Kerala are presented in this paper along with recent technological changes in the sector. Since its introduction in commercial fisheries, several changes and improvements have taken placein the design and operation of purse seines. The dimensions of the gear which was about 320x28 m during early 1970s, increased to 823x73 m during late 1990s and further to 1200x100 m towards 2015. Mesh sizes used in the main body of the seine which were 12-13 mm during the early days of introduction of the gear, increased to 20-46 mm in recent years. Therewas an upward shift in vessel sizes which reached up to 22 m LOA in recent years, with a significant escalation in installed engine horsepower to 285-510 hp. Mechanised purse seine vessels started using fish finding equipment, navigational and communication facilities like Echosounder, global positioning system (GPS) and very high frequency (VHF) radio, inrecent years. The role of technological skill of skipper and crew are very important in ensuring the success of purse seining operation and there is a need for technological facilitation in terms of the use of fish finding equipments like sonar, potential fishing zone (PFZ) information based on satellite based remote sensing, possible use of fish aggregating devices and adoption of gear handling equipment such as power blocks.

The effect of environmental variables, gear design and operational parameters on sinking performance of tuna purse seine setting on free-swimming schools

There are three main types of tuna purse seine operations: setting on free-swimming schools, setting on fish aggregation devices, or setting on marine mammal associated schools. In this research, we measured sinking performance of 88 purse seine sets on free-swimming skipjack (Katsuwonus pelamis) schools in the western and central Pacific Ocean from October 2006 to May 2013. The sinking behavior of a purse seine is influenced by many factors (e.g. netting materials, sinker weight, length-height ratio, mesh size, purse line length, setting position, setting speed, current, wind, etc.), it may be difficult to quantify the effect these factors have on the sinking performance. A purse seine set is considered to have a better sinking performance if its purse line reaches a greater depth in a shorter time period, i.e., higher sinking speed and greater sinking depth. A generalized additive model (GAM) was used to analyze sinking depth and sinking speed under different sea conditions (current speed and direction at different layers), gear design (length-height ratio, towing line length and purse line length), and operational methods (shooting duration and setting speed). The results in this study showed that the sinking performance of a purse seine with a lower length-height ratio was better than a seine with a higher ratio, current speed at 120m depth was the most important environmental factor affecting sinking depth of the purse seine. Sinking depth was strongly associated with length-height ratio, shooting duration and purse line length. Sinking speed was related to length-height ratio, shooting duration, current speed at 60m, purse line length and towing line length. The sinking performance models obtained from this study can be used to predict sinking behavior in relation to operational and environmental conditions, which is essential for the success of tuna purse seine operation on free-swimming tuna schools.

Catch composition and discard of the boat seine in the İstanbul Strait (Turkey)

This study attempted to determine certain characteristics of the species caught in the boat seine fishery in the İstanbul Strait during the 2009-2010 fishing season, including catch composition, commercial and nontarget catch ratios, catch per unit effort (CPUE), and the length distributions of commercial species. A survey of 20 boat seine operations detected species belonging to the following 3 different taxonomic groups: 26 Osteichthyes, 2 Crustacea, and 1 Mollusca. Of all of the nontarget species, 13 were commercial, 14 were noncommercial, and only 1 was under threat. Of the total catch, the proportion of the commercial species in the nontarget catch was 31.3%, and that of the discarded catch, which the fishermen did not take into account, was 2.8%. According to the Spearman rank correlation test, there was a significant correlation between the total catch and the discarded catch (r = 0.759); the size of discarded catch increased as the catch increased (P = 0.000). It was clear from the data that overfishing was seen in the commercial species.

Impacts of Traditional Shore Seine Operation along the Tuticorin Coast, Gulf of Mannar, Southeast India

Fishing pressure on marine ecosystems has increased drastically all over the world, especially in developing countries and particularly in India. Shore seine, a traditional fishing method, involves bottom trawling which makes huge impact on the ecosystems and consequently on fishing yield. It was observed that important habitats such as seagrasses and coral reefs are affected severely by this shore seine operation. Most of the catch was observed to be juvenile in nature or very small in size. Immediate measures are needed to check this operation by creating awareness among the fishermen coupled with providing alternative livelihood options.