22 UNIVERSITY OF WISCONSIN STUDIES 



Isla del Euro, 9 m., July 10; no. ex., 2; lengths: 205, 200. 

 Food; fish 100. 



Isla del Euro, 7 m., July 10; no. ex., 1; length 153. Food: 

 fish 100. 



Isla del Euro, 15 m., July 10; no. ex., 1; length 90. Food: 

 plankton algae 100. 



Isla del Euro, 5 m., rocky shore, July 10; no. ex., 5; lengths 

 305-186, ave. 233. Food: fish 48.3; 8 sardirfas (40-55 mm. 

 long) 33.3; dragon-fly nymphs (close to Perithemis). 18.3. 



Reed-grown shore, Maracay, 2 m., July 22; no. ex., 2; 

 lengths 263, 212. Food: fish 32.5; eel (Symbranchus, 60 mm. 

 long) 50; 2 damsel-fly larvae 12.5; gelatinous algae 5. 



Reed-grown shore, Maracay, 1.5 m., July 23; no. ex., 8; 

 lengths 370-189, ave. 222. Food : fish 90, Sialis-like insect 10. 



Off rush-grown shore, mud bottom, Maracay, 12 m., July 28; 

 no. ex., 8; lengths 399 (1.37 kilos) 139, ave. 251. Food: 

 none. 



This was the largest species of fish found in Lake Valencia. 

 The guabina is a fierce, predacious creature with sharp, strong 

 teeth. It ranges through all available habitats for its chief 

 foods fishes (90) and insects. When gill nets were pulled 

 once every twenty-four hours the guabina were often empty of 

 food, indicating that digestion is rapid. 



Lebistes reticulatus Peters, Sardina 



Isla del Euro, 1 m., July 11; number examined 10; lengths 

 21-14, ave. 16.4. Food: algae 96.1; Diptera 3.9. 



Rush-grown shore, Maracay, 5 m., no. ex., 10; lengths 

 30-13.5, ave. 21. Food: Cyclops 11.1; cladocerans 2.2; 

 ostracods 6.1; rotifers 2.6; algae 78. 



This little top-minnow feeds mostly on algae and plankton 

 animals. It is very hardy and lived for hours in collecting pails 

 after other fishes were dead. 



Pimelodella metae Eigenmann, Eagre 



Mouth of Rio Bue, July 29; number examined 10; lengths 

 79-37, ave. 61. Food: fish 8.3; insect larvae 7.3; chironomid 

 larvae 8; may-fly nymphs 23; damsel-fly nymphs 8.5; caddis-fly 

 larvae 1.5; beetle larvae 6.5; chironomid pupae 7.5; ostracods 

 .7; earthworm 14.5; plant .2; mud and debris 13. 



