CONTENTS 



Page 



Introduction 247 



Review of the fishery 247 



Methods of collecting data 249 



Estimating egg abundance 249 



Effect of temperature on length of incubation period 250 



Estimates of egg abundance and seasonal-regional distribution of spawners 252 



Boundaries of the spawning area 257 



Sources of error and bias in sampling eggs 258 



Retention of eggs by the nets 258 



Sampling of the vertical range 258 



Variable distribution of eggs 258 



SampHng of the horizontal range of spawning 261 



Effects of temperature on spawning 261 



Survival of the larvae 265 



Regional estimates of abundance of larvae 265 



Growth rate of larvae 269 



Sources of error and bias in sampling larvae 271 



Retention of larvae by the nets 271 



Sampling of the vertical range 272 



Variable distribution of larvae 272 



Sampling of the horizontal range 273 



Avoidance of net 274 



Summary 275 



Literature cited 275 



Appendix 277 



A. Fish egg incubator 277 



B. Staging scheme of jack mackerel eggs 278 



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