The Egg Mortality in Walleye Pollock (Gadus chalcogrammus Pallas, 1814) during Embryogenesis in Waters off the Western Kamchatka Coast
- Authors
- Type
- Published Article
- Journal
- Russian Journal of Marine Biology
- Publisher
- Pleiades Publishing
- Publication Date
- Jul 01, 2021
- Volume
- 47
- Issue
- 4
- Pages
- 249–255
- Identifiers
- DOI: 10.1134/S1063074021040040
- Source
- Springer Nature
- Keywords
- Disciplines
- License
- Yellow
Abstract
AbstractFive consecutive ichthyoplankton surveys were conducted during the spawning season of the walleye pollock Gadus chalcogrammus, in April and May 2019, at a spawning ground off the western coast of the Kamchatka Peninsula. Daily walleye pollock egg production was estimated for each survey based on the number of spawned eggs recorded. The total egg production and mortality rate during embryogenesis were calculated for the spawning season. The highest mortality rates were observed at egg stages I and III. The total mortality was 86.8% of the number of spawned eggs. The new results we obtained allow substantial improvement of quality of abundance estimates for the walleye pollock spawning stock in the Sea of Okhotsk.
