Oxygen depletion in coastal seas and the effective spawning stock biomass of an exploited fish species.

ABSTRACT: Environmental conditions may have previously underappreciated effects on the reproductive processes of commercially exploited fish populations, for example eastern Baltic cod, that are living at the physiological limits of their distribution. In the Baltic Sea, salinity affects neutral egg buoyancy, which is positively correlated with egg survival, as only water layers away from the oxygen consumption-dominated sea bottom contain sufficient oxygen. Egg buoyancy is positively correlated to female spawner age/size. From observations in the Baltic Sea, a field-based relationship between egg diameter and buoyancy (floating depth) could be established. Hence, based on the age structure of the spawning stock, we quantify the number of effective spawners, which are able to reproduce under ambient

SUBMITTER: Hinrichsen HH 

PROVIDER: S-EPMC4736919 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature