Spermatozoon, 157 



illustrated, 158 

 Spiny-rayed fish, 48, 51 

 Spiracle, 106 



Spiral valve, illustrated, 144 

 Starfish group, 255 

 Steelhead, 177, 178, 1 80-182 

 Striped bass, 211 



growth, 2-12, 213 



hatching period, 168 



illustrated, 142 



spawning, 212, 213 



structure, 212 



transplantation, 211 

 Sunfish, bluegill, 246 

 Surgeon-fish, 23 

 Survival, 240 

 Swordfish, 23, 69, 209 



attacks on ships, 209 



illustrated, 210 



young, 21 X 



Tags, 227 



Tail, heterocercaly 64 



homocercaly 64 

 Tarpon, 200 



air-bladder, 133, 205 



early stages, 202 



growth, 202, 203 



habitat, 201 



illustrated, 201 



leftocefhalusy 203 



relationships, 47, 202, 203 



spawning, 201, 202 

 Taste, 113, 114 

 Teeth, 140, 141 



pharyngeal, 141 

 Teleology, 8, 9, II 

 Temperature of body, 155, 156 

 Temperature sense, 1 1 1 



Index 283 



Tennessee Valley, 247 

 Test River, 40 

 Thermoclines, 149 

 Tile fish, 223 

 Tongue, 114, 141 

 Touch, 1 1 3 

 Toxotes jaculatofj 93 

 Trout, 175 



acuteness of vision, 94-95 



artificial propagation, 167 



brood fish, 238 



caecay 143 



catchable, 238 



classification, 176, 178 



color change, 40 



culture, 166-168 



distribution, 176, 177 



eggs, 166, 173 



fertilization of eggs, 239-245 



field of vision, 89 



fry, illustrated, 64 



golden, 29, 238 



hatchery-reared, 179, 240 



hatching time, 183 



hearing, loi 



High Sierra, 41 



movement of eye, 92 



ovaries, 171 



oxygen requirements, 148 



parr marks, 44 



spawning, 159, 166, 167, 179- 



183^ 

 speciation, 11 

 steelhead, 177, 178 

 structure, 47 

 survival, 237, 240 

 temperature requirements, 148 

 of Test River, 40 

 transplantation, 237-239 

 Trunk-fish, 23 



