FOOD AND FEEDING OF OYSTERS. 



1303 



made, whatever method be employed. In Matagorda Bay, where the present 

 method was first used, about 150 specimens of water were examined and the 

 additional time required was not over 10 per cent. The following table shows 

 the results and the manner of tabulation, as well as the differences in results 

 attained by the numerical and the volumetric methods : 



Food Value of Waters of Matagorda Bay." 



[Roman figures indicate volume of organisms, or food value. Bold-face figures indicate number of organisms.] 



No. 



Species. 



Coscinodiscus crassus.. 

 lineatus _ 



excentricus, 



Navicula didyma 



elliptica 



arenaria _ 



Amphora ovalis 



Pletirosigma f asciola _ _ 



obscurum 



intermedium 



tenuissimum 



angulata major. 



Synedra commutata 



sp- 



Melosira distans. 



sp 



Pyxilla sp 



Other diatoms. 



Prorocentrum micans. 



Total volume, or food value _ 

 Total number of organisms. . 



Prairie shore 



Middle of bay 



Peninsula shore _ 



A. 



Between 



Sand and 



High 



Mound 



signals. 



soo 



121 . 805 



3,483 



10. 500 



1,750 



4. 125 



375 



1, 250 

 125 

 93 7 



376 



2, soo 

 500 

 250 



125 

 375 



5, 600 



s.ooo 



I. 7SO 



500 



52. 500 



2,625 

 250 



1,250 



18.37s 

 2,625 



219.342 

 23.108 



20S, 527 

 259. 774 

 190, 049 



B. 



Between 

 High 



Mound 

 and Lake 



signals. 



141,470 



4,042 



J7.S02 



2.917 



6. 413 



583 

 1,660 



166 

 1, 145 



458 



292 



6.650 

 9,500 



68. 340 

 3,417 



500 



29.456 

 4,208 



273.861 

 26,416 



C. 



Between 



Mad Island, 



West, and 



Lake 



signals. 



917 



142, 90s 



4,083 



17. 760 



2.960 



9,625 



875 



4, 160 



416 



1,688 



675 



62s 



125 



125 



125 



125 



9. 100 



13,000 



3. 790 



1,083 



73.340 



3,667 



675 



292 



8,7So 

 1,250 



271. 743 



30,393 



287. 737 

 345. 200 

 188, 4SO 



239,024 

 267, 000 

 314.412 



D. 



Between 



Shell 

 Island and 

 Mad Island 



reefs. 



250 



183, 750 

 5,250 



12. 000 

 2,000 



II. 000 

 1.000 



2, soo 

 550 



3. 7SO 

 1,500 



1,250 



25. 55° 

 36,500 



I. 750 



500 



35. 000 



1,750 



250 



8.750 

 1,250 



284. oso 

 51,750 



259,875 

 274.350 

 317,625 



E. 



Between 



Dog Island 



and Shell 



Island 



reefs. 



100 



141. 7SO 

 4,050 



5.55° 

 925 



I, 000 

 100 

 250 

 100 

 500 

 100 

 425 



225 

 350 



8,155 

 11,650 



2. 275 



650 



18, 160 



908 



200 

 300 



177. 640 

 20,083 



159. 937 

 177, 900 

 193. 770 



F, 

 Between 

 Dog Island 

 and Pa- 

 vilion 

 signal. 



500 



122, soo 



3,500 



12, 000 



2,000 



5,000 

 500 



I, 250 

 6()0 



500 

 500 

 250 



I, 400 

 2,000 



250 



20, 000 

 1,000 



250 

 1,000 



3. soo 

 500 



13.250 



89.925 

 254,925 

 153.725 



aFrom Survey of Oyster Bottoms in Matagorda Bay, Texas, by H, F, Moore. Bmeau of Fisheries Document 6io. 



