I304 



BULLETIN OF THE BUREAU OF FISHERIES, 

 Food Value of Waters of Matagorda Bay — Continued. 



No. 



13 



14 



IS 

 16 

 17 

 18 



19 



Species. 



Coscinodiscus crassus.. 

 lineatus _ 



excentricus . 



Navicula didyma. 

 elliptica. 



Amphora ovalis. 



Pleiirosigma fasciola 



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 . 



G. 

 Between 

 Pavilion 

 and Three- 

 mile sig- 

 nals. 



375 



135.625 

 3375 



17. 250 

 2,875 



250 



.438 

 ,375 

 625 

 125 



{ -' 



[,500 

 125 



962 

 ,375 

 . 250 

 ,500 

 000 

 500 

 250 

 250 



.62s 

 375 



178,27s 

 14,750 



151. 050 

 186.599 

 189.67s 



H. 

 Between 

 Three-mile 

 and Seven 

 mile sig- 

 nals. 



292 



163,310 



4,666 



13, 248 



2,208 



2, 7SO 



250 



4. 170 



417 



23° 

 292 



I. 250 

 250 

 166 



750 

 166 



1,517 



2,167 



I, 793 



541 



542 

 167 

 125 



S.8 



133 



833 



194. 600 

 13,832 



162, 900 

 182.925 

 238.349 



Between 

 Seven- 

 mile and 

 Grass 

 signals. 



792 



198.310 



5,666 



16. 002 



2,667 



3, 212 



292 



12. 500 



1,250 



1.458 



583 



166 

 125 

 166 

 166 

 167 

 642 

 917 

 SSI 

 166 

 20. 000 

 1,000 

 167 

 125 



7.875 

 1,125 



260. 580 

 15,a40 



191. 700 

 357.650 

 232, 250 



J. 



Between 



Grass and 



Dressing 



Point 



signals. 



200 



18. 720 

 3,392 



9. 150 

 1,525 



1.686 



2,408 



4.812 



1,375 



13.500 



675 



208 



100 



517 



14. S8i 



2,083 



Live Oak 

 Bay. 



IS7. 500 

 4,500 



750 

 750 



1.575 

 2,250 

 s. 250 

 1,500 



750 

 2.250 



5. 250 

 750 



167.792 

 15,207 



177. 075 

 15,750 



182. 470 

 152.525 

 168.674 



Above 



Dressing 



Point. 



140. 000 



4.000 



3. 498 



583 



4.587 



417 



2, 500 



250 



5. 420 



2,167 



1,665 



333 



166 



250 



583 



I. 166 

 1.666 



I r . 081 

 3,166 



383 



500 



1 1 . 669 

 1,667 



181.586 

 16,964 



In the study of the food actually consumed by the oyster, it has been 

 regarded, heretofore, as sufficient to remove the stomach contents by means of 

 a pinette inserted in the mouth or through an incision in the body walls. This 

 method extracts but an indeterminate portion of the undigested food in the 

 stomach, a considerable proportion remaining in the folds of that organ and in 

 the wide openings of the hepatic ducts, and it removes practically nothing of 

 the intestinal contents. For quantitative work the method is very defective, 

 and it is useless as a basis for those studies of food consumption and the rate of 

 feeding which must have an important place in the oyster investigations of the 

 future. 



In order to remove the entire contents of the alimentary canal, I am now 

 using the apparatus illustrated in figure 6, which is essentially a combination of 

 stomach pump and enema, effectually irrigating the entire digestive tube. It 

 consists of a reservoir (A), connected by a flexible siphon tube with a glass 

 canula (B) ligated in the rectum, and of an aspirator (C) connected through the 

 medium of a vial or test tube (D) with another canula (E) inserted in the mouth. 



