172 
BULLETIN OF THE BUBEAU OF FISHERIES 
The following fish were taken in surface collections of 1893 to 1907: 
Anguilla rostrata (Lesueur). 
Leptocephalus conger (Linnaeus). 
Clupea harengus Linnaeus. 
Brevoortia tyrannus (Latrobe) . 
Anchovia brownii (Gmelin). 
Osmerus mordax (Mitchill). 
Apeltes quadracus (Mitchill). 
Syngnathus fuscus Storer. 
Menidia menidia notata (Mitchill). 
Ammodytes americanus De Kay. 
Poronotus tricanthus (Peck). 
Stenotomus chrysops (Linnaeus). 
Tautogolabrus adspersus (Walbaum). 
Tautoga onitis (Linnaeus). 
Lactophrys trigonis (Linnaeus). 
Spheroides maculatus (Bloch and Schneider). 
Myoxocephalus seneus (Mitchill)?. 
Cyclopteras lumpus Linnaeus. 
Pholis gunnellus (Linnaeus). 
Crj'ptacanthodes maculatus Storer. 
Anarhichas lupus Linnaeus. 
Prionotus carolinus (Linnaeus). 
PoUachius virens (Linnaeus). 
Microgadus tomcod (Walbaum). 
Gadus callarias Linnaeus. 
Urophycis sp. 
Rhinoneumus cimbrius (Linnaeus). 
Brosmius brosme (Miiller). 
Lophius piscatorius Linnaeus. 
Pseudopleuronectes americanus (Walbaum). 
Hippoglossoides platessoides (Fabricius). 
Lophopsetta maculata (Mitchill). 
Pomolobus pseudoharengus (Wilson). 
Seriola zonata (Mitchill). 
Limanda ferruginea (Storer)?. 
GENERAL CONCLUSIONS 
I shall not attempt to summarize all the conclusions arrived at during the 
past year. For the most part these have been taken up under the various subjects 
and in the discussion on plankton. The following are some of the more general 
conclusions concerning the nature of the plankton and the physical factors affecting 
its distribution, resulting from a 2-year study of the Woods Hole pelagic fauna: 
1 . Woods Hole is an excellent location for the study of the seasonal distribution 
of plankton. 
2. It is impossible to investigate diurnal distribution in Great Harbor. The 
current rushing through the passage during the flood tide mixes the water so com- 
pletely that the distribution of plankton remains the same at all times. The entire 
body of water is afi^ected at the same time, even during periods of sudden heating 
or rapid cooling of the air. 
3. No great amount of fresh water enters Woods Hole. The salinity averages 
about 31.5. For this reason titrations are of importance in determining the 
presence of ocean water. 
4. As in the case of the benthonic animals, the plankton of this region is made 
up of a complex of faunas. It forms the northern limit of many southern species, 
the southern limit of many northern species, and a pocket where oceanic animals 
blown in by strong southerly winds are deposited. 
5. The tropical species appear gradually in Great Harbor in the summer, but 
stop suddenly in the fall. This is because the temperature of the water in Buzzards 
Bay rises higher than that of the coastal waters in summer but responds quickly to 
the falling temperature of the air and by fall becomes much colder. Animals 
carried into this region in simamer survive, but in the fall the lower temperature 
proves fatal and few live to be carried through the passage back into the deeper 
waters. However, members of this group may be taken throughout the fall in 
Vineyard Sound, where the decline in temperature is not so rapid. 
