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1978. The prediction of shrimp landings from sunspot ac- 

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Peterson, W. t. 



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Milton s. love 

 William v. westphal 



Department of Biology. Occidental College 

 1600 Campus Road 

 Los Angeles, CA 90041 



FECUNDITY OF THE AMERICAN LOBSTER, 

 HOMARUS AMERICANUS, IN 

 NEWFOUNDLAND WATERS 



In lobster (genus Homarus) fisheries generally, 

 current minimum legal size limits are below the 

 size at 50% female maturity and fishing mortality 

 rates are very high ( Anonymous 1979 ) . Under such 

 conditions, widespread recruitment overfishing 

 appears to be a distinct possibility. Conventional 

 yield per recruit assessment models are not totally 

 adequate when dealing with lobsters and this has 

 led to the development of models which are much 

 more species oriented (Caddy 1977, 1979; Ennis 

 and Akenhead 1978). A feature of these models 

 which resulted from concern with recruitment 

 overfishing is provision for assessing the effect on 

 population fecundity of changes in size limit and 

 fishing mortality. In addition to size-maturity in- 

 formation, such assessments require data on 

 fecundity. 



Unfortunately, the general applicability of size- 

 fecundity relationships for the American lobster, 

 Homarus americanus, which are available from 

 the literature, is suspect. Saila et al. (1969) con- 

 cluded that the methodology used by Herrick 

 (1911) resulted in quite substantial overestimates 

 of egg numbers. The size-fecundity relationship 

 Saila et al. ( 1969) presented was based on samples 

 obtained from three widely separated areas; how- 

 ever. Squires (1970) and Squires et al. (1974) 

 suggested that size-fecundity relationships for 

 American lobsters in different areas could be quite 

 different. Squires' (1970) methodology was similar 

 to that of Herrick but he found that his estimates 

 varied from actual counts by <2%, an error factor 

 comparable with that reported by Saila et al. 

 (1969) and Perkins (1971) using electronic count- 

 ers. Aiken and Waddy (1980) suggested that stan- 

 dardized egg counts from different areas would 

 clarify the question of geographic variation in 

 American lobster fecundity and concluded that 

 Herrick's estimates should not be dismissed until 

 the results of these or other, more explicit studies 

 are available. 



This paper presents new fecundity data for a 

 Newfoundland area as a contribution to the litera- 

 ture on the subject and provides comparisons with 

 published size-fecundity relationships. 



Materials and Methods 



796 



Ovigerous females were included in samples ob- 



FISHERY BULLETIN: VOL. 79, NO. 4. 1981 



