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Effect of egg size on the growth rate and survival of wild walleye pollock Gadus chalcogrammus larvae

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Title: Effect of egg size on the growth rate and survival of wild walleye pollock Gadus chalcogrammus larvae
Authors: Kajiwara, Keitaro Browse this author
Nakaya, Mitsuhiro Browse this author →KAKEN DB
Suzuki, Kota Browse this author
Kano, Yota Browse this author
Takatsu, Tetsuya Browse this author →KAKEN DB
Keywords: egg diameter
growth-selective hypothesis
hatch check
larva
maternal effect
otolith
recruitment
water temperature
Issue Date: 9-Mar-2022
Publisher: John Wiley & Sons
Journal Title: Fisheries oceanography
Publisher DOI: 10.1111/fog.12575
Abstract: To clarify the survival process of walleye pollock larvae of the Japan Pacific stock in relation to the individual egg size, we estimated the original relative egg diameter from the diameter of the hatch check formed on larval sagittal otoliths. Significant positive correlations were obtained between egg diameter and embryonic body length, yolk sac volume, and lapillar otolith diameter in 3-year groups (2013-2015 year classes) collected with a plankton net in Funka Bay. Embryos before hatching were without a check; however, checks were observed on all larval otoliths just after hatching. The check diameters showed significant positive regressions to age at collection (days after hatching) in 2014 and 2015 year classes, however not in the 2013 year class. Diameters of eggs collected with a ring net in Funka Bay gradually increased from 2013 to 2015 year classes. During the 2013-2015 spawning seasons, the proportion of adult females of the 2007 and 2009 year classes, which had relatively high abundances, gradually increased to higher proportions with age (43%, 57%, and <73%, respectively), indicating that the mechanism by which the eggs gradually became larger. The low water temperature experienced by the spawners ca. 2 months earlier, advancement in spawner age, and increase of repeat spawners (at least twice in their life time) would contribute to the increase in egg size and growth and survival rate of walleye pollock larvae.
Type: article
URI: http://hdl.handle.net/2115/84339
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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