study. Also, we did not detect any morphological 

 changes that accompany formation of the epitokes 

 as described by Simpson (1962). 



Swimming bloodworms at night have also been 

 reported for two other Maine inshore waters. 

 Dean^ saw 22 bloodworms during observations 

 made between 24 January and 29 March 1977 on 

 33 nights. The worms were present during five 

 nights in March and 15 were collected under a 

 night-light in the Damariscotta River, Maine — 8 

 on 11 March and 7 on 12 March. The gametes of 

 the worms were not sexually mature and the pre- 

 sence of the worms near the surface at night was 

 not related to spawning. Dean also reported that 

 buoyed and anchored nets set in Montsweag Bay 

 and the Sheepscot estuary between 1970 and pre- 

 sent captured 22 glycerids, some of which were G. 

 dibranchiata. In contrast, the senior author of this 

 paper did not capture bloodworms in buoyed and 

 anchored nets set in the Sheepscot estuary over 

 the same time period and in the same vicinity. 

 Possibly, the swimming of bloodworms at night is 

 sporadic. 



A recent study of residual currents in Sullivan 

 Harbor suggested that the relatively shallow nets 

 above the edge of the channel (Figure 1) and at the 

 surface over the tidal flats strained a residual 

 seaward flow transporting tychoplankters and the 

 relatively deep nets strained a residual landward 

 flow. Distribution of bloodworms throughout the 

 water column would, therefore, insure their wide 

 dispersal by horizontal tidal currents, and it is 

 unlikely that after a tidal cycle they would regain 

 the location of their original burrows. 



We hope to study further the bloodworms of 

 Sullivan Harbor and do not wish to speculate on 

 their origin or fate at this time. Rather, it is our 

 purpose to suggest that researchers investigating 

 bloodworms within their bottom habitat should 

 also examine their possible role as tychoplankters 

 for two reasons: populations of this important 

 commercial species in separate flats may become 

 intermixed, introducing problems in their man- 

 agement; and the reestablishment of worm popu- 

 lations previously destroyed by pollution or other 

 environmental catastrophe might proceed more 

 rapidly in those areas where there is winter trans- 

 port of mature worms, as well as the "normal" 

 dispersion of late spring larvae. 



Acknowledgements 



We thank C. Adams and D. Clifford of the Maine 

 Department of Marine Resources for collecting the 

 worms, sometimes under severe winter condi- 

 tions, and for processing the worms in the labora- 

 tory. We thank D. Dean for permitting us to cite 

 his unpublished manuscript. 



Literature Cited 



ANONYMOUS. 



1974. Environmental inventory, benthic invertebrates. A 

 socio-economic and environmental inventory of the North 

 Atlantic Region, Vol. 1, p. 71-73. Res. Inst. Gulf Maine. 



Greaser, E. p., Jr. 



1973. Reproduction of the bloodworm (Glycera dibran- 

 chiata) in the Sheepscot Estuary, Maine. J. Fish. Res. 

 Board Gan. 30:161-166. 



Dow, R. L., AND E. P. Greaser, Jr. 



1970. Marine bait worms, a valuable inshore resource. 

 Atl. States Mar. Fish. Gomm. Leafl. 12, 4 p. 



Graham, J. J., and P. M. W. Venno. 



1968. Sampling larval herring from tidewaters with 

 buoyed and anchored nets. J. Fish Res. Board Can. 

 25:1169-1179. 

 KLAWE, W. L., AND L. M. DICKIE. 



1957. Biology of the bloodworm, Glycera dibranchiata 

 Ehlers, and its relation to the bloodworm fishery of the 

 Maritime Provinces. Fish. Res. Board Gan., Bull. 115, 

 37 p. 

 PETTIBONE, M. H. 



1963. Marine polychaete worms of the New England re- 

 gion. U.S. Natl. Mus., Bull. 227, 356 p. 

 Simpson, M. 



1962. Reproduction of the polychaete Glycera dibran- 

 chiata at Solomons, Maryland. Biol. Bull. (Woods Hole) 

 123:396-411. 



JOSEPH J. Graham 

 EDWIN P. Greaser, Jr. 



Maine Department of Marine Resources 



Research Laboratory 



West Boothbay Harbor, ME 04575 



'Dean, D. The swimming of bloodworms (Glycera spp.) at 

 night. Unpubl. manuscr. 



SIMULATED FOOD PATCHES AND 



SURVIVAL OF LARVAL BAY ANCHOVY, 



ANCHOA MITCHILLI. AND SEA BREAM, 



ARCHOSARGUS RHOMBOIDALIS 



Survival rates of laboratory-reared marine fish 

 larvae often are directly related to prey concentra- 

 tion. Best survival usually has been reported 

 when prey are available at concentrations 

 > 1,000/1 ( O'Connell and Raymond 1970; Laurence 



483 



