Zenitani and Yamada: The relation between spawning area and biomass of Japanese pilchard, Sardinops melanostictus 



847 



5,000 10,000 15,000 20,000 



Spawning biomass (x 10'' ton) 



Figure 7 



Difference between relationships III and V. Closed 

 circles indicate the observed data. The solid 

 line indicates relationship III (A, =0.80296' «"", 

 A/C=4.2 ). The dotted line indicates relationship V 

 (A, =64011 - 10.1283/(0.1283/0.1283 + 0.0001516 

 B)r"2S''|,A/C=4.3). 



opment of methods will depend on management goals, 

 performance of the resource in recovery, and fishery devel- 

 opment. We believe that the method in our study provides 

 a new tool for the estimation of Japanese pilchard biomass 

 when information concerning the fishery is limited. 



Acknowledgments 



The authors would like to thank T. Wada and M. Ishida. 

 National Research Institute of Fisheries Science, for their 

 assistance with data processing. This work was supported 

 in part by the Bio Cosmos Program of the Ministry of Agri- 

 culture, Forestry, and Fisheries. 



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