Troll Line Research Articles

An economic feasibility analysis of the automatic operation system development for hairtail trolling line in Jeju region, Korea

An economic feasibility analysis of the automatic operation system development for hairtail trolling line in Jeju region, Korea

Participatory Boat Tracking Reveals Spatial Fishing Patterns in an Indonesian Artisanal Fishery

The Spermonde Archipelago holds one of the largest artisanal fisheries in Indonesia, providing livelihoods for local communities and many other people involved in international trade networks of seafood. High demand and a lack of enforcement of existing fisheries regulations turn into high pressure for the coral reef ecosystem, contributing to its overall degradation. Estimations on the ecological impacts of different levels of fishing pressure, as well as fisheries stock assessments and marine resource management require precise information of the spatial distribution of fishing effort, which involves great uncertainty when only anecdotal information is considered. We explored the feasibility of applying participatory boat tracking to complement fisheries data during the NW monsoon season 2014-2015. We conducted interviews, measured catch landings and distributed GPS data loggers among hook and line fishermen to identify fishing grounds by gear-dependent patterns of boat movement. Most of the fishing activities involved two gears (octopus bait and trolling line for live groupers) and three fishing grounds. The mass of catch landings was dominated by Octopoda (CPUE=10.1 kg boatday-1) while the most diverse group was the fish family Serranidae, with Plectropomus leopardus being the main target species. In conclusion, boat tracking combined with interviews and catch surveys has proven a useful tool to reduce uncertainty in information on spatial resource use, while allowing a high level of participation by fishermen.

Conservation of small hairtail Trichiurus japonicas by using hooks with large artificial bait: effect on the trolling line fishery

Overfishing has reduced the stock of hairtail Trichiurus japonicus around the Bungo Channel, Japan. To determine whether using larger bait in the trolling line fishery could avoid catching small/undersize hairtail, we developed and trialled a new large artificial bait (a soft plastic bait, 6 inches long). A traditional lure with natural bait (type-1), a new lure of the new artificial bait hook without natural bait (type-2), and a new lure with natural bait (type-3) were tested in fishing operations around the Bungo Channel. Compared with type-1, type-2 and type-3 caught fewer undersized and immature female individuals. The number of fish caught, yield, and composition of commercial size grades per recruitment were calculated from field data for each lure and compared. The catch sizes (number of fish per recruitment) were smaller for type-2 and type-3 than for type-1, but yield per recruitment was higher for type-3 than for type-1. Compared with type-1, type-2 and type-3 caught more large individuals, which are more valuable. The newly developed artificial bait conserves hairtail stocks by targeting larger fish, which is economically beneficial for the hairtail trolling line fishery.

A transdisciplinary research of coastal fisheries co-management: the case of the hairtail Trichiurus japonicus trolling line fishery around the Bungo Channel, Japan

Under the coastal fisheries co-management regime in Japan, local fishers play important roles in deciding on and implementing local management measures. Therefore, using the case study of a hairtail trolling line fishery, we conducted a transdisciplinary research with fishers, processors, government officers, etc. Taking social and biological factors into account, we defined management criteria and targets (resource, economic, human community, and local food culture) in collaboration with local fishers. We chartered local fishing vessels to determine parameters that were easily understood by local fishers. We established a local consultative committee comprising fishers, processors, and distributors, and developed a fish distribution strategy to nurture the local hairtail food culture. The integrated effects of various management scenarios were evaluated by the operating model. We found that co-ordinated management by both the trolling line fishery and purse seiners in the neighbouring prefecture was required to achieve targets. Two realistic scenarios are recommended: a conservative scenario that could achieve targets even with few strong year classes, and an adaptive scenario that protects strong year classes, but relies on a higher frequency of these. We shared these results with the local fishers and government officers, which led to actual improvements in management measures.

Economic Analysis of the Hook and Line Fishery in Kombuthurai Coast, Tamil Nadu

The present investigation is about the economic analysis of the hook and line fishery along the coast of Kombuthurai, Thoothukudi district of Tamil Nadu. Inferences from the study indicated that that hook number 5, 6 and 7 were found ideal for commercial exploitation of Carangids, Grouper, Barracuda and Needlefish in angling by wielding fresh condition live bait. Using the artificial lure number 3.5, 4.0 and 4.5 applied in trolling line, the most dominant catch was seer fish (80%) and least in sailfish (8%). Significantly the study reports that the highest gross revenue ₹42060/trip was made in trolling line than that of the handline of ₹26400/trip ascribed by targeted of high market value species. The trolling line crew share per person was twice over than the handline fishing (₹3821/trip). Instead of unorthodox eye estimation of fish weight, a novel approach of weight based fish sale (for low to high market value species) was observed in Kombuthurai fishing village and this practiced also espoused by a neighbor fishing village.

FISHING ZONE IN KARIMUNJAWA NATIONAL PARK

<p align="center"><strong><em>ABSTRACT</em></strong><em></em></p><p><em>Karimunjawa National Park (KNP) consists of 7 zones i.e., core, protection, tourism, residence, rehabilitation, cultivation, and traditional fisheries utilization zone. Fishing activities in the traditional fisheries utilization zone (TFUZ) was not optimal because of limited of fishing zone information. The objective of this study was to determine the fishing zone based on major fish for each fishing gear. This study was conducted in KNP from October to December 2009. The major fish resources were determined through analyses of comparative performance index (CPI). Fish resource potential was analyzed by bio-economic model. The existence of fish resources were used as a basis of arrangement of fishing gear arround the fishing zone, through consideration of fishing gear characteristics, the characteristics of waters, the probabilities of conflict, degradation of fish resources, and regulations. Map of fishing zones were created using geographicl information system. Results showed that potential fishes around the TFUZ were reef fishes such as trevallies, yellow tail, and grouper. The potency of r</em><em>eef fishes was about 149 tons/year and pelagic fish of 19,080 tons/year.</em><em> Fishing zones around the TFUZ consisted of (1) area of 0-3 miles from coastal line which was allocated as the fishing zone of reef fishes using hand line and fish trap, (2) area of 3-4 miles from coastal line which was allocated as demersal fishing zone using bottom gillnet, (3) area of 0-4 miles from coastal line which was allocated as pelagic fishing zone using surface gillnet, and (4) area that more than 4 miles which was allocated as pelagic fishing zone using</em><em> dynamic fishing gear (troll line), and boat lift net.</em></p><p> </p><p><strong><em>Keywords: </em></strong><em> fishing zone, reef fish, pelagic fish, gillnet, Karimunjawa</em></p>

FISHING ZONE IN KARIMUNJAWA NATIONAL PARK

ABSTRACTKarimunjawa National Park (KNP) consists of 7 zones i.e., core, protection, tourism, residence, rehabilitation, cultivation, and traditional fisheries utilization zone. Fishing activities in the traditional fisheries utilization zone (TFUZ) was not optimal because of limited of fishing zone information. The objective of this study was to determine the fishing zone based on major fish for each fishing gear. This study was conducted in KNP from October to December 2009. The major fish resources were determined through analyses of comparative performance index (CPI). Fish resource potential was analyzed by bio-economic model. The existence of fish resources were used as a basis of arrangement of fishing gear arround the fishing zone, through consideration of fishing gear characteristics, the characteristics of waters, the probabilities of conflict, degradation of fish resources, and regulations. Map of fishing zones were created using geographicl information system. Results showed that potential fishes around the TFUZ were reef fishes such as trevallies, yellow tail, and grouper. The potency of reef fishes was about 149 tons/year and pelagic fish of 19,080 tons/year. Fishing zones around the TFUZ consisted of (1) area of 0-3 miles from coastal line which was allocated as the fishing zone of reef fishes using hand line and fish trap, (2) area of 3-4 miles from coastal line which was allocated as demersal fishing zone using bottom gillnet, (3) area of 0-4 miles from coastal line which was allocated as pelagic fishing zone using surface gillnet, and (4) area that more than 4 miles which was allocated as pelagic fishing zone using dynamic fishing gear (troll line), and boat lift net. Keywords: fishing zone, reef fish, pelagic fish, gillnet, Karimunjawa

TREND TINGKAT KESEJAHTERAAN NELAYAN DI WILAYAH PESISIR KABUPATEN KUTAI KARTANEGARA (Trend of Welfare Fishermen at Coastal Area of Kutai Kartanegara Regency)

<p>The factors affecting the welfare can be classified into economic factors, social, and psychological. One measurement welfare from an economic perspective can done with the exchange rate approach. Value. The exchange must be able to describe the fishery ability of fisheries (catching and aquaculture) to meet the needs of (goods and services) with resources derived from fisheries activities. Measurements with this concept is considered more reflect the actual conditions, because measurements by just looking at the changes income (households) without notice changes in the costs not comprehensively describe their welfare. When the concept of exchange rate fishermen (NTN) and exchange rate farmers fish (NTPi) describes the indicators for measuring the purchasing power of the need goods and services required, then when the value the higher the index of the exchange rate will be more welfare. Location of activities carried out in coastal areas Kutai Kartanegara regency covers Sub District of Muara Badak, Anggana, Sanga-Sanga, Muara Jawa, Samboja, and Marangkayu. The data obtainedin the field (primary) and secondary data is then compiled, categorized and analyzed. The focus of the study consisted of two analytical resultsare Exchange Fishermen (NTN) and Fishermen Exchange RateIndex (INTN) were divided into 3groups: Household Fishermen, fishing by fishing fleet, and fishing based on the type of fishing gear. The exchange rate fisherman (NTN) in total revenues and receipts fishery in 2012 based on their fishing geareach consisting of mini trawl of 1.13 and 1.76; trammel net of 1.16 and 1.69; guiding barrier was 1.04 and 1.94; bottom longline 1.28 and 2.07; crab traps of 1.02 and 1.97; troll line of 1.04 and 1.50; and step on the chart of 1.14 and 1.88. Exchange Rate Index fishermen (INTN) total revenues and receipts fishery in 2012 by fishing geareach consisting of mini trawl of 80.65 and 82.19; trammel net of 74.90 and 72.32; guiding barrier at 68.89 and 68.06; bottom longline at 62.78 and 62.20; crabs traps of 75.01 and 75.17; troll line for 71.64 and 69.18; and step on the chart at 69.29 and 69.76.</p><p><br />Key words: fishermen, trend, welfare,</p>

Subsistence fishing methods of Nicobari tribes using traditional knowledge

Abstract Nicobarese are one of the six aboriginal tribes inhabiting Andaman and Nicobar Islands. They account for over 95% of the total tribal population in the islands and majority of them inhabit at Car Nicobar, which is the capital of Nicobar district and popularly called as Coconut Island. The Nicobari tribes are hunters and gatherers who use their indigenous knowledge for exploitation of marine fishery resources using locally available materials. The common fishing methods in vogue are tamatu (trap), thanam kak (spear with rope) chok / linreny kak (spear with rubber), kinyav (icthyotoxic seed), thakua kak (line), kel thakua kak (hand line), tamarotha thakua kak (long line), Hanak Inhal Kak (shore seine), Inruon thakua kak (troll line) and Inhal (gill net). The Nicobari tribes have inherited the skill for designing and operating these gears from their forefathers. This paper summarises the traditional knowledge existing and commonly practiced among the Nicobari tribes for exploitation of marine fish at Car Nicobar.

DYNAMICS OF GEARS, FLEETS, CATCH AND FISHING SEASON OF SMALLSCALE TUNA FISHERIES IN LABUHAN LOMBOK, WEST NUSA TENGGARA

In Indonesia, about 80% of fishing activities are small-scale and play major role both economically and socially. Previous studies mostly concentrated in Java, while in eastern part of Indonesia the information still scarce and limited. The study was conducted from January to December 2013, describes in detail the gears, fleets and catch dynamics of the small-scale tuna fisheries operating based in Labuhan Lombok Coastal Fishing Port (PPP. Labuhan Lombok). Small-scale tuna fishery in Labuhan Lombok are characterized by the small boats less than 10 GT, operating both troll line and hand line simultaneously, targeting large tuna, skipjack tuna and small tuna. Fishing season starts from April to August and influence by southwest monsoon wind and the presence of middleman as the connector between fishers and the market are the main character of the small-scale fisheries business in this area.

KONSTRUKSI DAN PRODUKTIVITAS RUMPON PORTABLE DI PERAIRAN PALABUHANRATU, JAWA BARAT

Fish Aggregating Device (FAD) usually used by small and large scale fishermen in Indonesia are FAD shallow and deep sea water which fix in the water. Effectiveness and efficiency research activity about portable FAD in the water to catch Thunnus spp. and skipjack have never been done in Indonesia. This research divided into two stages : portable FAD design, fishing trial with portable FAD used handline and troll line in Palabuhanratu waters. The purpose of this research was to make portable FAD design, fishing trial used Electric Fish Attractor (EFA) with different frequency and to compared effectiveness of catch composition with handline and troll line. The result of this study were design FAD portable with length and width 1 m, the material is manglid wood, the attractors are raffia line and attractor and sinker line used PE with diameter 4 mm and tin sinker, EFA with frequency 10-1.000 Hz catch Caranx fasciatus and Trichiurus sp., whereas EFA with frequency 1.000-20.000 Hz catch 2 fish of Thunnus albacares with length 30 cm and weight 40 kg, catch composition used handline was Trichiurus sp. 63%, Nemiptarus sp. 10%, Caesio cuning 7%, Euthynnus spp. and semar 4%, Lutjanus spp. and Thunnus albacares 2%, whereas catch composition with troll line was Rastrelliger spp, Caesio cuning, and Selaroides spp. 1%.

Effect of oceanographic parameters on daily albacore catches in the Northeast Atlantic

In recent years, albacore (Thunnus alalunga) catches decreased strongly in the Eastern part of the Bay of Biscay. In order to understand the drivers of local albacore catches by fisheries in this area, we analyzed the influence of temperature, salinity and trophic parameters on albacore daily catches by three fleets (baitboat, trolling line and pelagic trawling) traditionally operating in the Bay of Biscay and its surrounding waters. For this, we used oceanographic data obtained from the operational model Regional Ocean Model System (ROMS), for each catch date and location. A Principal Component Analysis performed on these oceanographic data, on Julian day, latitude and longitude, yielded three synthetic variables used as explanatory variables in Generalized Additive Models (GAMs). The first one synthesized most of the variability related to temperature, plankton concentration and longitude. The second one synthesized most of the variability related to surface mixing associated with a seasonal trend. The third one synthesized most of the variability related to salinity and latitude. GAMs revealed a non-linear effect of salinity and latitude on daily catches for all fleets. The effect of mixing was negative for surface gear catches and positive for trawl catches. The trophic and planktonic component had a clear influence only on baitboat and trolling catches. The results are discussed in terms of albacore habitat preferences, vertical distribution and feeding behavior. We suggest that these environmental influences should be considered when using albacore catch data for stock assessment and extrapolating the effects of climate change on albacore abundance in the Bay of Biscay.

The rare, giant gorgonian Ellisella paraplexauroides: demographics and conservation concerns

A striking occurrence of the gorgonian coral Ellisella paraplexauroides off the Chafarinas Islands (western Mediterranean) requires serious conservation attention owing to considerable damage initiated by small fishing operations. Although this gorgonian is among the largest Atlantic-Mediterranean invertebrates, its biology remains virtually unknown. The studied population, established within an area of regulated fishing, was in unusually shallow waters (12−32 m). Density averaged 0.5 colonies m −2 (max 5 m −2 ); colony volume averaged 48 ml (max 511 ml), height averaged 76 cm (max 167 cm), and number of branches averaged 16 (max 72). Allometric growth revealed increasing branching and thickening once colonies reached approxi- mately 60 cm in height. Size distribution suggested moderate to low recruitment. Three geo- graphic zones of fishing pressure (A−C) were semi-quantitatively identified, based on the activity of a small-scale fishing fleet: 'A' had the highest level of fishing pressure (frequent gillnetting, trolling lines, and occasional trawling); 'B' had the lowest level (occasional gillnetting and fishing lines), and 'C' an intermediate level. Most fishing gear was tangled in the gorgonians in zones A and C. Mortality and colony damage were significantly higher in zones with intensive and poorly regulated fishing activity and appeared unrelated to predation or disease. In high-pressure zone A, about half (44.6%) of the colonies were dead, while about 82% of the surviving colonies showed significant damage, with a large number of epibionts disrupting colony functioning. The Chafarinas population of E. paraplexauroides is likely a unique Mediterranean relic from a Mau- ritanian-Senegalese Pleistocene interglacial expansion but is now being seriously impacted by illegal fishing.

EFEKTIVITAS PEMANFAATAN RUMPON PADA OPERASI PENANGKAPAN IKAN DI PERAIRAN KEI KECIL, MALUKU TENGGARA

One of ways to increase the fishing operation effectiveness is done by using fish aggregating device (FAD) called rumpon. The types of FAD used in Kei Kecil waters made from bamboos or plastic drum material. This research objectives are (1) determining catch composition around FAD, (2) comparing the effectiveness of two types of FAD on fishing operation, and (3) comparing the effectiveness of fishing gears, operated around the FAD. The method that used in this research was doing survey through observing fishing activities around the FAD. Fishing gear and FAD samples were determined through purposive sampling method. These data were collected from August to October 2007 in Kei Kecil Waters of South East Maluku. The kind of fish catch around FAD were scad mackerel, frigate mackerel, and barred spanish mackerel. The most dominant of catch was scad mackerel (80%), whereas percentage e of frigate mackerel and barred spanish mackerel were 19% and 1%. The composition of the length size of scad mackerel, frigate mackerel, and barred spanish mackerel were dominated by the large size. Type of bamboo FAD was more efective compared with the plastic drum FAD type. Purse seine fishing was more efective compared with gillnet and troll line fishing that operated around rumpon.

Leading Commodity Analysis of Capture Fisheries in Karimunjawa National Park

K a r imunjawa National Parks (TNKJ) is a marine conservation area which has 111.625 ha area with the majority of r esidents work as fishermen. Utilization of traditional fisheries zone intended for fishing activities. Therefore, fishing activities in TNKJ should be conducted in accordance with the principles of conservation. The aim of this study was to determine the winning fish fishery commodities in TNKJ. The selection of commodities was done by using comparative performance index (CPI). Analysis of potential fish resources is done with bioeconomic model. Optimizing the amount of fishing equipment was done by using linear goal programming (LGP). Feasibility of the business conducted by financial analysis. The results showed commodities TNKJ reef fisheries are pompano, and for pelagic fisheries are anchovies. Reef fish resource potential of 174 tons / year and pelagic fish of 22 069 tons / year. Appropriate fishing technologies for reef fisheries is the fishing rod elongation and traps, while for the pelagic fishery and gillnet fishing minnows on trolling lines. Financial analysis shows that all fishing gear is still viable to continue the effort. Key words: Selection commodities, fishing activities, Karimunjawa National Parks

PENGARUH POSISI TALI UTAMA DAN KECEPATAN ARUS TERHADAP GERAKAN SWINGING DAN DIVING DARI MODEL TROLLING BOARD

Trolling board is an important troll line accessory which can produce swinging and diving movements of the lure. A laboratory study on the effect of trolling board main line position and current speed on swinging and diving movements was done in a water circulating tank at the Faculty of Fisheries and Marine Science, Sam Ratulangi University. At low speed, the widest swing reached at main line position near the center of trolling board, but at high speed, it reached main line position near the fore tip. Swinging frequency decreased with the current speed. The depth of diving increased as the main line position got closer to the tip and increased with current speed.

Underwater Observation of Fish Behavior to Artificial Bait of Trolling Line by Towed Video Camera

Underwater Observation of Fish Behavior to Artificial Bait of Trolling Line by Towed Video Camera

Age and growth of blackfin tuna (Thunnus atlanticus) caught under moored fish aggregating devices, around Martinique Island

Daily growth increments measured in the otolith of Thunnus atlanticus were used to estimate the age and growth of individuals, which were sampled from an artisanal fishery operating around fish aggregating devices (FADs) moored off Martinique Island. In this study, 76 otoliths were analysed for fish ranging from 20 to 68 cm fork lengths (FL). The fish were caught using trolling lines at depths ranging from 0 to 10 m. Counts were made, under a light microscope, on the external part of the transverse section of the sagittae, from the primordium to the ventral edge. The mean coefficient of variation of the age reading was 2.4%. To validate readings, the number of increments for 11 individuals was counted using both optic and scanning electron microscopes. The calculated relationship between readings of both methods was found to be linear, with a slope of 1.03 and R 2 = 0.99. Frequency of growth increment formation could not be validated. Growth rates derived from otolith readings were, however, compared to those obtained using a modal progression analysis, which was performed on the length-frequency distributions of the landings over a period of two months. The corroboration between the growth rates was good. One increment was assumed to represent one day. The parameters of the von Bertalanff yg rowth curve for both sexes wereL∞ = 71. 4c mFL, k = 0.002 day −1 and t0 = −80 days. According to our results, there is no evidence that Martinican moored FADs act as ecological traps for blackfin tuna. Instead, young blackfin tuna probably leave the vicinity of Martinican moored FADs to undergo a trophic migration at 7 to 8 month-old, and then come back about 8 months later to breed in the Lesser Antilles area.

The Locus of the Movement for the Trolling Depressor Estimated by the Tension of the Trolling Line

The Locus of the Movement for the Trolling Depressor Estimated by the Tension of the Trolling Line

New source of colour coded signal wire sleeving for cryogenic applications

Wire sleeving made from Pb core nylon fishing line is presented. Signal wires can easily be sheathed in the nylon outer of weighted trolling line by drawing them through the outer attached to the core. Such line comes with a selection of colours on a single spool.