41 35 55° 60° 100 99 86 17 8 12 100 86 22 8 14 64° 87 23 ll 31 week*** week ; last died on two completed hatching All died within 3 days All died by 20th day but died 2 days later (28th day) Greatest mortality about time of last died on 50th day hatching; sac; All died before absorption of yolk 165th day (April 28) Two survived to feeding; High mortality during absorption of yolk sac Did not feed; weight at 46th week less than at hatching None hatched; all dead after 156 days Remarks Cumulative mortality in per cent to 34th 46th 1951. water temperature was above 63°F *k*Pirst week in July. **Approximately the day on which all yolk sacs were abosrbed. *The day on which 50% of lot was hatched. range temp. city 63 126 6 19 27 66 water] 54°-42° 42°-47° 55°-41° 41°-47° 46°-63° 63°-67° Greatest mortality after July 4 when 100 74° 100 76 22 5 13 100 28 73 81 97 67° 65° 62-1/R° 32 51 50° 6 80 45° 145 7 225 128 ing 40° yolk sac** 100 ing* Number of days to Hatch- Abs. of |Hatch- Feeding 34° temp.| Lot and Eggs from a single pair from Soos Creek spawned on November 15, of chinook salmon reared at city water temperature and various constant temperatures. Numbers of days to hatching and absorption of yolk sac and per cent cumulative mortality 1 wn