Initial Egg Weight, Time to Maximum Alevin Wet Weight, and Optimal Ponding Times for Chinook Salmon (Oncorhynchus tshawytscha)

Publisher Website
Google Scholar
Abstract
Eggs of chinook salmon (Oncorhynchus tshawystscha) were segregated into 8 size groups (range 163-437 mg) and incubated at 5.degree., 7.5.degree., 10.degree. and 12.5.degree. C. The time required to reach maximum alvein wet weight (MAWW) varied significantly (P < 0.01) both with mean incubation temperature (T.degree. C) and with initial egg weight (W mg). A good (R2 = 98.4%, n = 21) prediction of days postfertilization to MAWW (D) is given by ln D = 5.88 - 0.152T + 0.000513W. Optimal ponding times are closely associated with the attainment of MAWW and can be estimated using this equation. Data relating mean incubation temperatures (T) to actual ponding time were collected from 17 hatcheries throughout British Columbia [Canada]. The equation ln D'' = 5.99 - 0.150T, where D'' is days postfertilization to ponding, provided the best fit to the data (R2 = 97.5%, n = 85). Hatchery ponding time were not significantly different from times to MAWW predicted for 200-mg eggs.

This publication has 5 references indexed in Scilit: