eCite Digital Repository

The maternal effect of differences in egg size influence metabolic rate and hypoxia induced hatching in Atlantic salmon eggs: implications for respiratory gas exchange across the egg capsule

Citation

Polymeropoulos, ET and Elliott, NG and Frappell, PB, The maternal effect of differences in egg size influence metabolic rate and hypoxia induced hatching in Atlantic salmon eggs: implications for respiratory gas exchange across the egg capsule, Canadian Journal of Fisheries and Aquatic Sciences, 73, (8) pp. 1173-1181. ISSN 0706-652X (2016) [Refereed Article]

Copyright Statement

Copyright 2016 The Authors

DOI: doi:10.1139/cjfas-2015-0358

Abstract

The maternal effect of fish egg size has profound implications for oxygen transfer across the egg shell surface, and therefore metabolism, especially under adverse environmental conditions like hypoxia. We found that metabolic rate (MO2) of Atlantic salmon alevins was higher than of eggs in normoxia and hypoxia. Equally, the MO2 of smaller eggs from maiden spawners was lower than that of larger eggs from repeat spawners. Critical partial pressure of oxygen (PO2) for hatching was lower in eggs from repeat spawners. Generally, the PO2 within the egg capsule was lower for a given ambient PO2 and decreased further with hypoxia, and the internal PO2 was higher, the bigger the volume of the egg. Therefore, we conclude that the egg capsule poses a major barrier to oxygen exchange for the mature embryo that is more severe in eggs from maiden spawners than in eggs from repeat spawners. This was corroborated by a more advantageous egg surface area to MO2 ratio in eggs from repeat spawners. These findings challenge the "bigger is worse during incubation" hypothesis.

Item Details

Item Type:Refereed Article
Keywords:Atlantic salmon, hypoxia, hatching, maternal effect, egg size
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Fin Fish (excl. Tuna)
Author:Polymeropoulos, ET (Dr Elias Polymeropoulos)
Author:Elliott, NG (Dr Nick Elliott)
Author:Frappell, PB (Professor Peter Frappell)
ID Code:110990
Year Published:2016
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2016-08-25
Last Modified:2017-11-03
Downloads:0

Repository Staff Only: item control page