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dc.contributor.authorDickson, Jonathan O.
dc.date.accessioned2018-12-05T08:59:26Z
dc.date.available2018-12-05T08:59:26Z
dc.date.issued1997
dc.identifier.citationDickson, J. O. (1997). Study on turtle excluder and by-catch reduction devices in the Philippines. In Proceeding of the Regional Workshop on Responsible Fishing, Bangkok, Thailand, 24-27 June 1997 (pp. 308-328). Samut Prakarn, Thailand: Training Department, Southeast Asian Fisheries Development Center.en
dc.identifier.urihttp://hdl.handle.net/20.500.12067/762
dc.description.abstractExperimental test-fishing of different TED types, namely : modified Thai Turtle Free Device (TTFD), Super Shooter (SS) and Hooped TED were conducted for eight (8) fishing days in March and April 1997 in Manila Bay. Assessment of the TED performance, i.e. its separating efficiency (escapement) and effect to catch (retained) was observed. Likewise, a single cod-end trawl (without TED) was also tested to serve as control. A total catch of 538.3 kgs. were obtained from thirty-two (32) sets of tow or eight (8) tows for each type. Of these, retained catch was 459.62 kgs. (85.38% relative abundance) while escaped accounts a total of 78.7 kgs. or 14.62% of the over-all catch. Lowest escapement was recorded in the modified TTFD with a total of 13.64 kgs or a mean escapement rate of 1.71 kgs. per hour of dragging (11.55% of the over-all catch). The modified TTFD, likewise, has the highest total of shrimps retained with 8.83 kgs or 1.10 kgs/hr (8.45% of the mean total retain) which is slightly higher than the control. Relative escapement rate for shrimps was recorded least in the SS with 0.05 kgs/hr followed closely by modified TTFD with 0.07 kgs/hr/drag. Initial results indicated that the modified TTFD has a better output if the TED performance factor to be considered were least escapement rate and higher shrimp catching efficiency. It is imperative that more test trials be conducted to validate each of the TEDs efficiency. Proof of the actual turtle release is also very crucial to support the use of trawl-fitted with TEDs. Some by-catch reduction devices were also tried. Sorting efficiency of shrimp selective devise with upper and lower panels was tested in shrimp trawl. Shrimps were expected to concentrate at the upper portion because of its behaviour. Preliminary results indicated that greater catching efficiency of the lower bag was observed. Catch difference between shrimps and by-catch at the upper and lower portion of separator grid was significant and sorting efficiency of shrimps from by-catch was low. Studies on square-meshed codends for trawl and Danish seine, and purse seine mesh selectivity are also presented.en
dc.language.isoenen
dc.publisherTraining Department, Southeast Asian Fisheries Development Centeren
dc.subjectPhilippinesen
dc.titleStudy on Turtle Excluder and By-catch Reduction Devices in the Philippinesen
dc.typeConference paperen
dc.citation.spage308
dc.citation.epage328
dc.subject.asfasustainable fishingen
dc.subject.asfasustainabilityen
dc.subject.asfamarine fisheriesen
dc.subject.asfaTurtle entanglementen
dc.subject.asfaTurtle excluder devicesen
dc.subject.asfaBy-catch excluder devicesen
dc.subject.asfaSea turtlesen
dc.subject.asfatrawlingen
dc.subject.asfatrawl netsen
dc.subject.asfaGear selectivityen
dc.subject.asfaEscarpmentsen
dc.subject.asfacatch compositionen
dc.subject.asfacatch statisticsen
dc.subject.asfashrimp fisheriesen
dc.subject.asfaSeine netsen
dc.subject.asfaFishing netsen
dc.subject.asfaSeiningen
dc.subject.asfaNet fishingen
dc.subject.asfacommercial fishingen
dc.subject.asfapelagic fisheriesen
dc.citation.conferenceTitleProceedings of the Regional Workshop on Responsible Fishing, Bangkok, Thailand, 24-27 June 1997en


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