tained during late spring-early summer towards 

 the end of the incubation period. 



Fecundity values calculated from the relation- 

 ships in Figure 2 range from 4,800 to 7,450 at 70 

 mm carapace length and from 25,400 to 38,300 at 

 125 mm. The relationship of Saila et al. (1969) 

 gives the lowest values over the entire range of 

 sizes considered. This relationship is suspect, 

 however, since it is based on samples obtained 

 from three widely separated areas. Over most of 

 the size range considered the relationship for 

 Placentia Bay gives higher estimates than those 

 from the relationship derived by Saila et al. (1969) 

 from Herrick's (1911) data, indicating that Mer- 

 rick's data should not be discounted as Saila et al. 

 (1969) suggested. 



Definitive statistical comparisons of size- 

 fecundity relationships for American lobsters 

 from different areas would require large samples 

 which adequately cover a wide range of sizes. Even 

 with such samples comparisons could be some- 

 what confounded by geographic variation in size 

 at first maturity, which, for certain areas, would 

 preclude direct comparison of fecundity at smaller 

 sizes. In addition, samples would have to be taken 

 at approximately the same stage in the incubation 

 period by the same method of capture and be sub- 

 jected to similar handling and procedures for de- 

 termining egg numbers. These requirements are 

 unlikely to be met in the foreseeable future. How- 

 ever, as tenuous as the comparisons presented here 

 may be, they do suggest substantial geographic 

 variation in size-fecundity relationships for 

 American lobsters. 



ANONYMOUS. 



1979. Report of the Homarus Working Group. ICES ( Int. 

 Counc. Explor. Sea) CM. 1979/K:8, 49 p. 



Caddy, J. F. 



1977. Approaches to a simplified yield-per-recruit model 

 for Crustacea, with particular reference to the American 

 lobster, Homarus americanus. Can. Fish. Mar. Serv. 

 Manuscr. Rep. 1445, 14 p. 



1979. Notes on a more generalized yield per recruit analy- 

 sis for crustaceans, using size-specific inputs. Can. Fish. 

 Mar. Serv. Manuscr. Rep. 1525, 7 p. 

 ENNIS, G. P., AND S. A. AKENHEAD. 



1978. A model and computer program used to assess yield 

 per recruit in Newfoundland lobster stocks. CAFSAC 

 (Can. Atl. Fish. Sci. Advis. Comm.) Res. Doc. 78/30, 13 p. 



HERRICK, F H. 



1911. Natural history of the American lobster. Bull. 

 [U.S.] Bur. Fish. 29:149-408. 

 PERKINS, H. C. 



1971. Egg loss during incubation from offshore northern 

 lobsters (Decapoda: Homaridae). Fish. Bull.. U.S. 

 69:451-453. 

 SAILA, S. B., J. M. FLOWERS, AND J T. HUGHES. 



1969. Fecundity of the American lobster. Homarus 

 americanus. Trans. Am. Fish. Soc. 98:537-539. 



SQUIRES, H. J. 



1970. Lobster (Homarus americanus) fishery and ecology 

 in Port au Port Bay Newfoundland. 1960-65. Proc. Natl. 

 Shellfish. Assoc. 60:22-39. 



SQUIRES, H. J., G. P ENNIS, AND G. E. TUCKER. 



1974. Lobsters of the northwest coast of Newfoundland, 

 1964-67. Proc. Natl. Shellfish. Assoc. 64:16-27. 



G. P ENNIS 



Research and Resource Services 



Department of Fisheries and Oceans 



RO. Box 5667. St. John's. Newfoundland AlC 5X1 



Acknowledgments 



I am grateful to G. Da we who participated in the 

 collection of samples and, with the assistance of a 

 number of casual employees, carried out the tedi- 

 ous task of obtaining egg counts. The assistance of 

 P. W. Collins in performing the various data 

 analyses and drafting the figures is also gratefully 

 acknowledged. 



Literature Cited 



AIKEN, D. E., AND S. L. WADDY. 



1980. Maturity and reproduction in the American lob- 

 ster. In W.C. Anthony and J. F. Caddy (editors), Proceed- 

 ings of the Canada-U.S. Workshop on Status of Assess- 

 ment Science for N.W. Atlantic Lobster (Homarus 

 americanus) Stocks, St. Andrews, N.B., Oct. 24-26, 

 1978. Can. Tech. Rep. Fish. Aquatic Sci. 932, 186 p. 



800 



MORTALITY OF SEABIRDS IN 

 HIGH-SEAS SALMON GILL NETS* 



Since 1952, the Japanese have operated a large 

 salmon driftnet fishery in the northern North 

 Pacific Ocean and Bering Sea. This fishery is di- 

 vided into two components: the high-seas mother- 

 ship fleet, which consists of several processing 

 ships and their numerous, smaller catcher boats 

 that remain at sea during the entire fishing sea- 

 son, and the land-based fleet, which consists of 

 independent fishing boats that catch and store 

 their ovm fish and return to Japan at more fre- 



' Contribution No. 224 of the Point Reyes Bird Observatory 

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



