4 



39. What amount of food do they consume ? 



H. Reproduction. 



40. Is there any marked change in the shape or color of either 

 sex during the breeding season ; or any peculiar development of, or 

 on any portion of the body, as the mouth, fins, scales, etc.? 



41. Are there any special or unusual habits during the spawning 

 season ? 



42. Is spawning interfered with by lines or nets, or otherwise ? 



43. At what age does the male begin to breed ; and at what age 

 the female ? 



44. For how many years can these fish spawn ? 



45. Does the act of spawning exert an injurious effect? 



46. Where do these fish spawn, and when ? 



47. Can you give any account of the process : whether males and 

 females go in pairs, or one female and two males : whether the 

 sexes are mixed indiscriminately, etc. ? 



48. Is the water ever whitened or colored by the milt of the male ? 



49. What temperature of water is most favorable for hatching ? 



50. At what depth of water are the eggs laid, if on, or near the 

 bottom ? 



51. What is the size and color of the spawn ? 



52. What is the estimated number for each fish • and how ascer- 

 tained ? 



53. Answer the question for one season, and for the lifetime ? 



54. Do tlie eggs, when spawned, sink to the bottom, and become 

 attached to stones, grass, etc., or do they float in the water until 

 hatched ? 



55. Do the fish heap up or construct any kind of nest, whether 



