Project Plan of Study on Catch Composition in Bottom Gillnet Fisheries, Ban Phe, Rayong Province

This is abstract on the Project Plan of Study on Catch Composition in Bottom Gillnet Fisheries, Ban Phe, Rayong Provinc

Guide for Fishing Gear Survey

The Guide for Fishing Gear Survey is a fishing technology manual developed for fishing gear technologists who have responsible to manage and undertake field survey of fishing technology. People who interested in fishing technology could use the part of appendix; Knowledge of Fishing Gear Material for Fishing Gear Surveyor, to be reference and manual of fishing technology

Standard Operating Procedures of Collapsible Fish Trap

In early times, flowing water caused by tidal movement and changes in river and lake levels were probably used to trap fish behind rudimentary barriers, often made from sticks and stones. It is likely that early humans found that fish catches could be improves by driving fish in to these barriers. They would have found that catches from these barriers decreased over time, as fish became accustomed to them, and would have had to move the traps to fresh areas where more fish could be caught. It would have been hard work to construct new traps, either by moving stones from the old trap or finding new ones. Primitive fishers probably tried making barriers from lighter, more readily available material such as tree branches, brunch and vines. This led to the fishers inventing lighter, movable traps made from brush and nets made from vines which they could carry with them when they moved to new areas. They may even tried bigger, more complicated corral-type fish traps in lake, rivers and coastal waters

National report of preliminary investigation to estimate the abandon, lost, and discard gillnet and trap (pots) along the coast of Thailand (Phang Nga and Krabi province)

Abandoned, Lost, or otherwise Discarded Fishing Gear (ALDFG) is widely recognized as a significant component of marine litter and has serious impacts on habitats, fish stocks, and other marine species. The Southeast Asian regional concern on marine debris including ALDFG has been raised in SEAFDEC Meetings. Therefore, SEAFDEC Training Department conducted a preliminary investigation to estimate the loss of gillnet and traps (pots) along the Coast of Thailand with support from FAO. One hundred and sixty (160) questionnaires were collected from 3 surveys conducted in Phang Nga and Krabi Province, Andaman Sea, Thailand. Results show that the estimated total trap loss is 5,154 traps/year with an associated economic loss of 64,805.08 USD/year. The estimated loss of gillnets is 458.50 units/year with an estimated associated economic loss of 13,467.14 USD/year. The main cause of the gillnet loss is nets becoming snagged on an obstruction, and the main cause of the trap (pot) loss is conflict with other gears. Researchers recommend expanding the survey to all coastal provinces of Thailand, both in the Gulf of Thailand and the Andaman Sea, and applying it to both small-scale and commercial-scale fisheries. The result could provide guidance for the development of management actions to reduce levels of ALDFG in the future

The Study on Benthic Litter around the Coastal of Sri Racha, Chon Buri Province

Distribution and accumulation of litter in the marine ecosystem is important issue. Marine litter is an environmental, economic, human health and aesthetic problem. Marine litter has been found in all marine habitats and in all the oceans of the world, not only in densely populated regions, but also in remote areas far from obvious sources and human contact. Marine litter is defined as “any persistent, manufactured or processed solid material discarded, disposed of or abandoned in the marine and coastal environment” (UNEP, 2009). The study on marine littler were conducted in recent years, particularly in European seas. Thailand has few information and study on marine litter. This study is the preliminary research to get the composition and density of marine litter

Preliminary Report Demersal Resources on the Un-trawlable Grounds in the South China Sea and Andaman Sea

The demersal fishery resources surveys on the continental slopes particularly in the un-trawlable grounds of South China Sea and the Andaman Sea have been conducting by SEAFDEC using the specific fishing gear such as bottom vertical longline or/and trap. The aim is to investigate the potential demersal resources existing on the continental slopes in the Southeast Asia waters through the actual fishing trails and data/information collection onboard the research vessels. This project is a part of ASEAN-SEAFDEC program on the "Sustainable Utilization of Potential Fisheries Resources and Reduction of Post-harvest Losses". A series of field surveys were carried out with collaboration to SEAFDEC member countries

The Survey of Fish Enhancing Devices (FEDs) at the Coastal Areas of Thailand

Coastal waters of Southeast Asia are blessed with high productivity of fisheries resources because of rich ecosystems such as dense mangrove forests and sea grass beds, as well as extensive coral reefs with clean tropical sea environment. These areas are critical to a broad range of aquatic organisms during their life cycle from breeding, spawning, nursing and growing, hosting the feeding zones of aquatic species that are economically important, and serving as important source of recruitment of a wide diversity of fishery resources. However, commercially important fishery resources in the region have declined due to many factors that include overfishing, illegal fishing, use of destructive fishing practices, and environmental degradation. The artificial reef has been the significant tool for fishing ground development and increasing fisheries production of the small scale fisheries. However, regarding the cost of artificial reef installation has high investment and managed by government agencies. Fishers only involve in the identification of fishing ground. The fishers' ownership on fishing ground could not be generated as well as management through community approaches has not been able to promote effectively. One of the SEAFDEC’s missions is to seek for the appropriate tools to enhance coastal fishery resources together with awareness building on the community management as well as promoting a shifting of resources user to be resource manager through the installation of Fish Aggregating Devices (FADs) that costs cheaper investment than artificial reef. SEAFDEC has promoted the new design of Fish Enhancing Device (FEDs) since year 2009 and Thailand was reported as the first to introduce the use of FEDs. Until now, the utilization of FEDs in Thailand has widely spread throughout the coastal province of Thailand and is used in various designs. In order to update the information on the structure and design of FEDs and to seek for the significant factors of FEDs construction and design that different between local and fishing ground. Thus, SEAFDEC/TD in cooperation with Department of Fisheries, Thailand conducte

Standard Operating Procedures of Isaacs-Kidd Mid-water Trawl

Isaacs-Kidd mid-water trawl (IKMT) is oceanography tool used to collect bathypelagic biological specimens larger than those taken by standard plankton nets. The trawl consists of the specifically designed net attached to a wide, v-shaped, rigid diving vane sometime called a depressor. The vane keeps the mouth of the net open and exerts a depressing force, maintaining the trawl at depth for extended periods at towing speeds up to 5 knots, but the optimum towing speeds should be 2-3 knots because of the high level of drag exerted by the net in the water. The inlet opening is unobstructed by the towing cable. The IKMT is a long, round net approximately 6.50 m long, with a series of hoops decreasing in size extending from the mouth of the net to the rear (cod) end, which measures an additional 2 m in length. The hoops maintain the shape of the net during towing. The mouth of the net is 1.75 m wide by 1.30 m high, and is attached to a depressor. The IKMT's largemouth opening and capacity for fast towing speeds enables capture a wider range of relatively large and more active organisms than smaller nets. In addition, its fine mesh allows it to snag animals that are not retained in the large trawl nets that are used for commercial fishing. Thus, it is well suited for capturing an array of fishes, squids and shrimp that inhabit the mid-water zone. To make sample collection easier, the IKMT is always used in conjunction with echo-sounders which provide a target area for the researchers to sample