YELLOWTAIL FLOUNDER OFF NEW ENGLAND 



235 



11. Marked faunal changes have occurred on 

 the yellowtail grounds. The area southeast of No 

 Mans Land at one time produced large quantities 

 of haddock, later yellowtail, and still later "trash" 

 fish. These changes in fish populations may be 

 associated with fundamental ecologic changes, 

 possibly a warming of the climate. 



12. The exact effect of the fishery on yellowtail 

 stocks is not known, but our studies indicate that 

 as the fishery removed the yellowtail from their 

 favored bottom new populations moved in, becom- 

 ing available to the fishery at an estimated 35 

 percent a year, in addition to any natural mortal- 

 ity. Unreplenished by young, the accumulated 

 stocks were used up by the fishery until there were 

 no other yellowtail to move in. There is evidence 

 that no significantly greater recruitment was pro- 

 duced by larger spawning populations, as but one 

 slightly dominant year class resulted during the 

 years of large spawning populations from 1938 

 to 1942. 



13. We do not believe that the great decline in 

 the catch of the southern New England stock was 

 caused by catching too many yellowtail, too small 

 yellowtail, or spawning yellowtail. There was no 

 evidence of a significant waste of small fish dur- 

 ing the period of this study. Therefore, no re- 

 strictive legislation appears needed unless there is 

 a radical change in the conduct of the fisheries. 



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