Kendall. — Rainhozv and Steelhead Trout 193 



salmon seldom attains a length of over 30 inches. Richard- 

 son's Salmo gairdnerii was stated by him to be 3 1 inches long, 

 and there are other differences from the blueback mentioned 

 in the description. 



From about 1880 to about 1895 the only rainbow trout 

 propagated and distributed in the east were raised from eggs 

 of trout from the McCloud River, which is one of the head- 

 water tributaries of the Sacramento River. They possessed 

 much smaller scales and were otherwise different from the 

 coastwise so-called rainbow trout. They were inhabitants of 

 cold water which fact indicates that they originated in a more 

 northern section of our previously mentioned zone system 

 than did the coastwise so-called rainbow and steelhead. With 

 the disappearance of the congenial cold coast waters they 

 were left behind, isolated in upper Sacramento waters, and 

 their differential characters became fixed, so to speak. 



By the scale count and by coloration, to say nothing of 

 certain other characters, there was and is absolutely no diffi- 

 culty in distinguishing a pure bred McCloud River type of 

 rainbow from marine steelhead forms wherever found, 

 whether in San Francisco Bay, Klamath, Rogue, Columbia 

 River and Alaska, or the Great Lakes or anywhere in eastern 

 waters. 



All of the steelheads which have been introduced into 

 eastern waters, so far as records indicate, came from Wash- 

 ington and Oregon. Their introduction into certain northern 

 waters of the east has been fairly successful as far as acclima- 

 tization is concerned. Attention should be called here to the 

 fact that practically all steelhead trout introduced into eastern 

 waters were derived from eggs obtained from wild fish, and 

 practically all rainbow eggs and young fish distributed for 

 many years, with few exceptions, have been derived from 

 domesticated fish in comparatively limited brood-stocks at 

 hatcheries. 



For a number of years the propagation of the rainbow met 



