臺灣博碩士論文加值系統

隨國際資源保育趨勢的發展，聯合國糧農組織及區域性漁業管理組織通過海鳥、海龜、鯊魚及鯨豚等重要混獲物種之保育措施，建議各國蒐集相關資料，並實施保育與管理措施。眾多資料蒐集方法中，觀察員計畫可提供混獲之詳實訊息，以供資源評估。但礙於經費等因素，並非所有漁船均皆可派遣觀察員登船紀錄，因此，本研究目的在於探討觀察員派遣方式，控制關鍵物種CPUE之變異係數，以提高資料可信度。
本研究以2004 ~ 2007年間我國168航次遠洋鮪延繩釣漁船觀察員資料為基礎，以目標魚種及混獲物種 (包含鯊魚、海鳥、海龜及鯨豚類)單位努力漁獲量 (CPUE)作為分層依據，將三大洋依據季節、作業區域分層，利用拔靴法 (bootstrap)估算每分層內各物種之單位努力漁獲量，以及對應不同觀察員涵蓋率下之物種CPUE變異係數。並依據混獲物種之分布，選擇各分層之重要關鍵物種，估算在關鍵物種CPUE之變異係數設定在30%所需之觀察員涵蓋率。進而以各分區關鍵物種CPUE變異係數為分派基準，結合總派遣天數以及區域性漁業管理組織要求的涵蓋率，估算最適涵蓋率。
結果顯示可將三大洋分成13區，其中南大西洋及西南印度洋區因分區內4季分層資訊齊全，資料筆數大於30且關鍵物種有顯著差異，予以季節分層。各分層關鍵物種變異係數控制在30%所需之觀察員涵蓋率最高者為南大西洋第1季 (關鍵物種為海鳥) 50%，最低者為南大西洋第2季、中大西洋、西北太平洋、西南太平洋及西南印度洋第1季皆為1%。以2009年觀察員62人換算全年可派遣最高執勤天數9548天進行分配，故建議全區關鍵物種CPUE變異係數控制於25%，大西洋平均涵蓋率為7.33%，太平洋為15.70%，印度洋為11.81%以上，區域分層方面，觀察員涵蓋率最高者為中西太平洋區之55%，最低者為東南印度洋區之4.58%。
總結而言，並非所有分區之觀察員派遣涵蓋率皆需達5%，才能使資料變異係數控制於30%，在中大西洋區、南大西洋區的第1、3季及西北及西南太平洋等區域可以降低觀察員努力量，移至其他區域，如南大西洋第1季、中西太平洋及東北印度洋，故未來在執行觀察員分派時應做整體考量，兼顧資料可信度、人力負荷以及國際組織要求。

Following the international trend on marine resources conservation, Food and Agriculture Organization of the United Nations and many Regional Fisheries Management Organizations adopted measures for conservation of important incidental catch species, include seabirds, sea turtles, sharks and marine mammals. Those organizations recommend related countries shall collect data and implement conservation and management measures. Among those data collection method, observer program could provide detail incidental catch information for evaluate the fisheries impacts on those bycatch species. However, not all fishing vessels could deploy observers because of budget limitation. The objective of this research is to discuss the observer coverage by control the coefficient of variance (CV) of catch per unit effort (CPUE), to improve the precision.
One hundred and sixty eight trips of Taiwanese distant water longline vessels observer trips data from 2004 to 2007 were used for analysis. The catch per unit effort (CPUE) of target species and bycatch species (including sharks, seabirds, seaturtles, and cetaceans) are used for spatial and temporal stratification. Bootstrap is used to estimate the CPUE and CV for each stratum under different observer coverage from 1% to 100%. The key conservation species are selected in accordance with their distribution. The observer coverage rate of key species under the CV =30% are considered as the minimum requirement for observer coverage requirement. In addition, the request from Regional fisheries management organizations, and total observers day are considered as well.
The results showed thirteen sub-regions are separated. Among these sub-regions, south Atlantic Ocean and southwest Indian Ocean are further separated by seasons because the data are more than 30 in each stratum and the CPUE of key species are significant difference for seasons. Among these strata, the coverage rate ranged from 50% (first season of south Atlantic Ocean for seabirds) to 1% (second season of south Atlantic Ocean, central Atlantic Ocean, northwest Pacific Ocean, southwest Pacific Ocean and first season of southwest Indian Ocean). The total observer days is 9548 days based on the number of observers was 62. We could control the CV at 25% for three oceans; which the coverage rate was 7.33% for Atlantic Ocean, 15.7% for Pacific Ocean, and 11.81% for Indian Ocean. Among these sub-regions, the observer coverage rate was highest in central western Pacific Ocean (55%), and the lowest in the southeast Indian Ocean (4.58%).
In conclusion, it is not necessary for all areas to deploy 5% observer to ensure the CV less than 30%. The central Atlantic Ocean, second and third season of south Atlantic Ocean, northwest and southwest Pacific Ocean could have less observer coverage. The additional observer could reallocate to other area, such as first season of south Atlantic Ocean, central western Pacific Ocean and northeast Indian Ocean. In the future, when deploying the observer, shall considered the data precision, total capacity of observer program and request from regional fisheries management organizations.

謝詞 .............................................................................................................. I
中文摘要 ..................................................................................................... II
英文摘要 ................................................................................................... IV
目錄 ........................................................................................................... VI
表次 .......................................................................................................... VII
圖次 ......................................................................................................... VIII
第一章 前言 ................................................................................................ 1
第一節研究背景 .................................................................................... 1
第二節研究動機 .................................................................................... 9
第三節研究目的 .................................................................................. 10
第二章 材料與方法 ................................................................................... 11
第一節資料來源 .................................................................................. 11
第二節時空分層 .................................................................................. 12
第三節物種CPUE及其變異係數之估算 .......................................... 13
第四節 關鍵物種選定 ........................................................................ 14
第五節 派遣天數估算 ........................................................................ 15
第三章 結果 .............................................................................................. 18
第一節各洋區CPUE及其變異係數 .................................................. 18
第二節分派天數與涵蓋率 .................................................................. 22
第四章 討論 .............................................................................................. 25
第一節 拔靴法應用之優點與限制—資料分層之選取 .................... 25
第二節 觀察員計畫之改善 ................................................................ 27
第三節 觀察員涵蓋率與資料變異係數 ............................................ 29
第五章 結論與建議 ................................................................................... 31
參考文獻 .................................................................................................... 32

Alverson, D.L., Freeberg, M.H., Murawski, S.A., Pope, J.G., 1996. A global assessment of fisheries bycatch and discards. Fisheries Technical Paper 339. FAO, Rome.
Babcock, E.A., Pikitch, E.K., Hudson, C.G., 2003. How much observer coverage is enough to adequately estimate bycatch? Pew Institute for Ocean Science Rosenstiel School of Marine and Atmospheric Science University of Miami, FL, p. 36.
Bailey, K., Williams, P., Itano, D., 1996. By-catch and discards in western pacific tuna fisheries: a review of SPC data holdings and literature. Oceanic Fisheries Programme Technical Report 34. WCPFC, Noumea, New Caledonia., p. 171.
Bartram, P.K., Kaneko, J.J., Kucey-Nakamura, K., 2010. Sea turtle bycatch to fish catch ratios for differentiating Hawaii longline-caught sea food products. Marine Policy 34, 145–149.
Beddington, J.R., Agnew, D.J., Clark, C.W., 2007. Current Problems in the Management of Marine Fisheries. Science 316, 1713-1716.
Beerkircher, L.R., Cortés, E., Shivji, M., 2002. Characteristics of shark bycatch observed on pelagic longlines off the southeastern United States, 1992–2000. Marine Fisheries Review 64. NOAA, pp. 40-45.
Belden, D., 2007. Estimates of cetacean and pinniped bycatch in the 2005 northeast sink gillnet and mid-Atlantic coastal gillnet fisheries. Northeast Fisheries Science Center Reference Document 07-08. NOAA, p. 24.
Belden, D.L., Orphanides, C.D., Rossman, M.C., Palka, D.L., 2006. Estimates of cetacean and seal bycatch in the 2004 northeast sink gillnet and mid-Atlantic coastal gillnet fisheries. Northeast Fisheries Science Center Reference Document 06-13. NOAA, p. 28.
Bergmann, M., Wieczorek, S.K., Moore, P.G., Atkinson, R.J.A., 2002. Discard composition of the Nephrops fishery in the Clyde Sea area, Scotland Fisheries Research 57, 169-183.
Bisack, K.D., 2003. Estimates of marine mammal bycatch in the northeast (New England) multispecies sink gillnet fishery in 1996. Northeast Fisheries Science Center Reference Document 03-18. NOAA, p. 30.
Brothers, N., Gales, R., Reid, T., 1999. The influence of environmental variables and mitigation measures on seabird catch rates in the Japanese tuna longline fishery within the Australian Fishing Zone, 1991-1995. Biological Conservation 88, 85-101.
Brothers, N.P., 1991. Albatross mortality and associated bait loss in the Japanese longline fishery in the southern ocean. Biological Conservation 55, 255-268.
CCSBT, 2009. Resolution on action plans to ensure compliance with conservation and management measures. CCSBT adopted at the Sixteenth Annual Meeting. Attachment 15.
Chassot, E., Amandè, M.J., Chavance, P., Pianet, R., RG, R.G.D., 2009. By-catch and discards in western pacific tuna fisheries: a review of SPC data holdings and literature. Collect. Vol. Sci. Pap. ICCAT, 64(4), 1054-1067.
Cortés, E., Arocha, F., Beerkircher, L., Carvalho, F., Domingo, A., Heupel, M., Holtzhausen, H., Santos, M.N., Ribera, M., Simpfendorfer, C., 2010. Ecological risk assessment of pelagic sharks caught in Atlantic pelagic longline fisheries, Aquat Living Resour 23, 25-34.
Crean, K., Symes, D., 1994. The discards problem: towards a European solution. Marine Policy 18, 422-434.
Diaz, G.A., 2010. A simulation study of the results of using different levels of observer coverage to estimate dead discards for the U.S. pelagic longline fleet in the Gulf of Mexico. SCRS/2010/058. ICCAT, p. 8.
Efron, B., 1979. Bootstrap methods:another look at the Jackknife. Zotero 7, 1-26.
Efron, B., 1987. Better Bootstrap Confidence Intervals. J. Amer. Statist. Assoc. 82, 177-185.
Efron, B., J.Tibshirani, R., 1993. An Introduction to the Bootstrap, New York.
FAO, 1999a. International plan of action for reducing the incidental catch of seabirds in longline fisheries. FAO, Rome.
FAO, 1999b. International plan of action for conservation and management of sharks. FAO, Rome.
FAO, 2003. Guidelines for developing an at-sea fishery observer programme.Fishery Technical Paper 414. FAO, Rome.
FAO, 2004. Expert consultation on Interactions between sea turtles and fisheries within an ecosystem context. FAO Fisheries Report No. 738. Rome.
FAO, 2005. Technical consultation on sea turtles conservation and fisheries. FAO Fisheries Report No. 765. Bangkok, Thailand.
FAO, 2009. Guidelines to reduce sea turtle mortality in fishing operations. FAO Fisheries Department., Rome, Italy, 128p.
FAO, 2011. The state of world fisheries and aquaculture 2010. FAO, Rome, Italy.
Fowler, C.W., 2008. Maximizing biodiversity, information and sustainability. Biodivers. Conserv. 17, 841-855.
Friday, N.A., Smith, T.D., Stevick, P.T., Allen, J., Ernald, T.F., 2008. Balancing bias and precision in capture-recapture estimates of abundance. Marine Mammal Science 24, 253–275.
Gilman, E., Clarke, S., Brothers, N., Alfaro-Shigueto, J., Mandelman, J., Mangel, J., Petersen, S., Piovano, S., Thomson, N., Dalzell, P., Donoso, M., Goren, M., Werner, T., 2007. Shark depredation and unwanted bycatch in pelagic longline fisheries-industry practices and attitudes,and shark avoidance strategies. Western Pacific Regional Fishery Management Council, Honolulu, Hawaii, USA. 149pp.
Gilman, E., Kobayashi, D., Chaloupka, M., 2008. Reducing seabird bycatch in the Hawaii longline tuna fishery. Endangered Species Research 5, 309-323.
Howell, E.A., Kobayashi, D.R., Parker, D.M., Balazs, G.H., Polovina, J.J., 2008. TurtleWatch: a tool to aid in the bycatch reduction of loggerhead turtles Caretta caretta in the Hawaii-based pelagic longline fishery. Endangered Species Research 5, 21-112.
Huang, H.-W., Liu, K.-M., 2010. Bycatch and discards by Taiwanese large-scale tuna longline fleets in the Indian ocean. Fisheries Research 106, 261-270.
Huang, H.-W., 2011. Bycatch of high sea longline fisheries and measures taken by Taiwan: Actions and challenges. Marine Policy 35, 712-720.
ICCAT, 2010. Recommendation by ICCAT to establish minimum standards for fishing vessels. Scientific observer program. Recommendation 10-10.
IOTC, 2010. Report of the Technical Meeting on the IOTC Regional Observer Scheme. IOTC Resolutions 10-04. Seychelles.
Klaer, N.L., Black, A., Howgate, E., 2009. Preliminary estimates of total seabird bycatch by ICCAT fisheries in recent years. Collect. Vol. Sci. Pap. ICCAT, 64(7), 2405-2414.
Løkkeborg, S., 2003. Review and evaluation of three mitigation measures-bird-scaring line, underwater setting and line shooter-to reduce seabird bycatch in the north Atlantic longline fishery. Fisheries Research 60, 11-16.
Lawson, T., 2004. Observer coverage rates and reliability of CPUE estimates for offshore longliners in tropical waters of the western and central Pacific ocean. SCTB17 working paper SWG-4. sixteenth meeting of the standing committee on tuna and billifsh. Mooloolaba, Queensland, Australia.
Limpus, C.J., Limpus, D.J., 2003. Loggerhead turtles in the equatorial and southern Pacific ocean: a species in decline. Smithsonian Institution Press, Washington, DC, USA.
Miyake, M.P., Miyabe, N., Nakano, H., 2004. Historical trends of tuna catches in the world.FAO Fisheries Technical Paper 467. FAO, Rome, p. 74.
NMFS, 2004. Evaluating bycatch a national approach to standardized bycatch monitoring programs. NOAA Technical Memorandum NMFS-F/SPO-66. NOAA, p. 108.
NOAA, 2010. National observer programs. NOAA National Marine Fisheries Service.
Polovina, J.J., Balazs, G.H., Howell, E.A., Parker, D.M., Seki, M.P., Dutton, P.H., 2004. Forage and migration habitat of loggerhead (Caretta caretta) and olive ridley (Lepidochelys olivacea) sea turtles in the central North Pacific Ocean. Fisheries Oceanography 13, 36-51.
Pradhan, N.C., Leung, P.-S., 2003. A Poisson and negative binomial regression model of sea turtle interactions in Hawaii's longline fishery. Fisheries Research 78, 309-322.
Ryan, P.G., Watkins, B.P., 2008. Estimating seabird bycatch by fisheries and its impact on seabird populations. Animal Conservation 11, 260-262.
Spotila, J.R., Reina, R.D., Steyermark, A.C., Plotkin, Paladino, F. V., 2000. Pacific leatherback turtles face extinction. Nature 405, 529-530.
Suzuki, S.C., Pauly, D., 2010. Failing the high seas: A global evaluation of regional fisheries management organizations. Marine Policy 34, 1036-1042.
Waugh, S.M., Baker, G.B., Gales, R., Croxall, J.P., 2008. CCAMLR process of risk assessment to minimise the effects of longline fishing mortality on seabirds Marine Policy 32, 442-454.
WCPFC, 2007. Conservation and management measure for the regional observer programme. WCPFC Resolutions 07-01.
Weimerskirch, H., Brothers, N., Jouventin, P., 1997. Population dynamics of wandering albatross Diomedea exulans and Amsterdam albatross D. amsterdamensis in the Indian Ocean and their relationships with long-line fisheries: Conservation implications. Biological Conservation 79, 257-270.
Wigley, S.E., Rago, P.J., Sosebee, K.A., Palka, D.L., 2007. The analytic component to the standardized bycatch reporting methodology omnibus amendment: sampling design, and estimation of precision and accuracy (2nd edition) Reference Document 07-09. NOAA, Northwest Fisheries Science Center, U.S., p. 156.
WWF, 2006. Tuna in trouble the challenges facing the world's tuna fisheries. World Wildlife Fund, Gland, Switzerland.
行政院農業委員會漁業署, 2009. 2009 annual report 行政院農業委員會漁業署年報.
行政院農業委員會漁業署, 2010a. 九十九年度我國鮪延繩釣漁船赴大西洋作業應行遵守及注意事項. 行政院農業委員會漁業署.
行政院農業委員會漁業署, 2010b. 九十九年度一百噸以上漁船赴太平洋從事捕撈鮪類及類鮪類作業應行遵守及注意事項. 行政院農業委員會漁業署.
行政院農業委員會漁業署, 2010c. 九十九年度一百噸以上漁船赴印度洋從事捕撈鮪旗魚類作業應行遵守及注意事項. 行政院農業委員會漁業署.
沙志一, 2007. 臺灣遠洋漁業回顧與展望. 臺灣漁業政策研究. 財團法人中正農業科技社會公益基金會, 臺北, 34-63.
楊豐隆, 2009. 我國漁業觀察員計畫執行成果. 農政與農情 210, 31-33.