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1
題名:剩餘生產量模式應用於資源評估之檢討    
Reconsideration of Assessing Fish Stocks with the Surplus Production Model
著者:王健雄(Chien-Hsiung Wang)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:剩餘生產量模式 ; 改良式剩餘生產量模式 ; Surplus Production Model ; Improved Surplus Production Model
刊名:台灣海洋學刊
卷期:35卷4期(1996.12)
頁碼:375-394
語言:繁體中文
摘要: 中文摘要PDF ; 英文摘要PDF

以剩餘生產量模式:dB/dt=rB(1-B/K)-Y,式中;B為資源量,t為時間,r為潛在成長率,K為環境收容力,Y=FB=漁獲量,F=qX=漁獲死亡率,q為漁獲率,X為努力量,進行資源評估時,若設定資源變動量為零(SPM法)時,可求得,最適漁獲量Y'op=r'K'/4,最適努力量X'op=r'/2q',最適資源量指數U'op=q'K'/2,最適漁獲死亡係數F'op=r'/2',最適資源量B'op=K'/2。 資源量在漁業持續的影響之下,於Bm=(K/2)(1-F/r)時的再生產量最大。因此,漁業管理的目標若設定在Y=FBm=再生產量(IPM法),可同時達成資源永績的平衡,漁業永續的經營,以及資源有效的利用等三大目標。此時可求得:最適漁獲量Yop=rK/9,最適努力量Xop=r/3q,最適資源量指數Uop=qK/3,最適漁獲死亡係數Fop=r/3,最適資源量Bop=K/3。 比之於SPM法,IPM法具有如下的優點:1.應用於漁業管理時,雖然IPM法的最適漁獲量較小,但是可以用較小的努力最獲得較高的單位努力漁獲量。2.除非是所得高達成本的三倍,否則業者將可由此獲得較高的利潤。3.最適漁獲死亡係數較低,最適資源量較高,對於資源的保護較為有利。4.清楚的資源量、再生產量、漁獲量與漁獲死亡係數之間互動關係,有助於檢視漁業管理的結果。
In assessing fish stocks with the Surplus Production Model (SPM), the temporal (t) change in the biomass B is dB=rB (1-B/K)-Y, where r=the intrinsic growth rate, K=the carrying capacity, Y=the catch, F=qX=the fishing mortality rate, q=the catchability and X=the fishing effort. When applying SPM method in assessing fish stocks, some points are worth noting. Results revealed that the optimal catch Y'op=r'K'/4, the optimal effort X'op=r'/2q', the optimal catch per unit of effort U'op=q'K'/2, the optimal fishing mortality rate F'op=r'/2 and the optimal biomass B'op=K'/2. If human exploitation exists continuously, then the maximum production occurs as the biomass Bm=(K/2) (1-Fir). The management of fisheries should assume that the catch equals the maximum production, or Y=FBm (the improved SPM, or the IPM method). In this way, it was found that the optimal catch Yop=rK/9, the optimal effort Xop=r/3q, the optimal catch per unit of effort Uop=qK/3, the optimal fishing mortality rate Fop=r/3 and the optimal biomass Bop=K/3. Compared with the SPM method, the IPM method affords several advantages: (1) a higher catch per unit of effort (CPUE) can be obtained with less effort even if there is a lower optimal catch; (2) fishermen can expect a higher net revenue unless the revenue is greater than three times their costs; (3) a lower optimal fishing mortality rate and a higher optimal biomass imply that the IPM method is more appreciable for population conservation; and (4) the clear relationships among biomass, production, catch and fishing mortality rate are useful for examining the result of fishery management.


    

本卷期目次
台灣海洋學刊 35卷4期 (1996.12)
Coherent Vortical Structure in a Sheared Turbulence Beneath the Air-Sea Interface/ Wu-Ting Tsai
剩餘生產量模式應用於資源評估之檢討/ 王健雄
Thermophilic Sulfate Reducers Present In Production Waters from North Sea Oil Field/ J-Y Leu
An Experimental Petrological Study at Atmospheric Pressure of the Two-pyroxene Andesite of the Kuanyinshan area, Northern Taiwan/ Teh-Ching LiuJan-Jee PanBore-Sing ChenChen-Hong Chen
On the Disconnection and Reconnection Mechanisms of Vortex Filaments Approaching the Air-Sea Interface/ Wu-Ting Tsai
利用化學螢光法測量表層海水中低濃度之硝酸鹽/ 江東山龔國慶劉康克
台灣東北方黑潮的線型不穩定性/ 李?運
 
   
 
   

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