8-33 



be due to a decline in lobster activity as a result of extreme water 

 temperatures and therefore fewer individuals collected in trawls. 

 Similar patterns of abundance have been observed at other Long Island 

 Sound sites. Thus at Port Jefferson (EEHI, 1977), lobster abundance 

 during 1976 increased from winter to spring and decreased during the 

 summer; however, no fall peaks in lobster abundance were observed. In 

 Stamford Harbor (NAI, 1974) peak abundances of lobster occurred during 

 fall, 1971, 1972, and 1973, while a spring peak was also observed during 

 1971. At Millstone Point (NUSCO, 1976) lobsters were impinged on cool- 

 ing-water intake screens of the Millstone Nuclear Power Station in 

 highest abundances during May and June, 1976, and in lesser abundances 

 in July; numbers were low during winter, late summer and fall. Whether 

 or not lobsters in New Haven Harbor migrate during periods of increased 

 activity is not certain. However, although inshore lobster populations 

 are generally non-migratory, seasonal movements related to changes in 

 depth and substrate do occur (Saila and Pratt, 1973) . For example, 

 immigration and emigration of lobsters in Fisher's Island Sound has been 

 described by Stewart (1972) ; lobster populations were observed to emi- 

 grate from the Sound during spring and early summer, and immigrate to 

 the Sound during fall, remaining until the following spring. This 

 correlates with abundance patterns observed in New Haven Harbor. 



Sqwttta empusa 



The stomatopod shrimp, Squilla empusa, ranges from New England 

 to South America and is found in shallow waters of the subtidal zone to 

 depths of 154 m (Gosner, 1971) . The mantis shrimp is a raptorial carni- 

 vore that feeds primarily on small fish and decapod shrimp (Caldwell and 

 Dingle, 1976) . A burrower, Squilla lives in irregular shaped holes and 

 trenches in the bottom. Examination of mantis shrimp burrows has 

 revealed that two distinct types of burrows are constructed and inhabited 

 on a seasonal basis (McCluskey, personal communication). During the 

 summer Squilla inhabits relatively shallow U-shaped burrows often with 

 two openings. During winter in northern waters Squilla abandons its 

 summer burrow and inhabits a deep vertical burrow (up to 4.4 m) con- 



