The Open Fish Science Journal




(Discontinued)

ISSN: 1874-401X ― Volume 12, 2019

Simulated Influences of Hatching-Date Dependent Survival on Year Class Composition and Abundance


The Open Fish Science Journal, 2010, 3: 169-179

Mark W.Rogers, Micheal S.Allen

School of Forest Resources and Conservation, The University of Florida, 7922 NW 71st Street, Gainesville, Florida 32653, USA.

Electronic publication date 11/10/2010
[DOI: 10.2174/1874401X01003010169]

CrossRef Citations:
0

Abstract:

Juvenile fish survival is often strongly density dependent and results in relatively consistent average recruitment over a wide range of spawning stock biomasses. Hatching date-dependent mortality can limit contributions of individual hatching sub-cohorts (i.e., fish hatched in one period relative to another within the overall hatching distribution) to the year class and influence the potential for compensatory survival. We used trophic-based ecosystem models to evaluate effects of hatching date- dependent survival on the potential for compensation and regulation of year class strength and adult biomass by simulating variable early-life mortality. We built one model using data for north Florida lakes to represent a contracted spawning distribution and one model for south Florida lakes to represent a protracted spawning distribution using data for largemouth bass Micropterus salmoides with hatching-date dependent survival. Hatching datedependent survival strongly influenced contributions of individual hatching sub-cohorts to year classes (up to 70+% change in sub-cohort biomass), but total effects on year class strength and adult biomass were small (range -9% to +13% total biomass change). Total survival to age-1 was largely regulated by predation such that increases in individual subcohort survival did not result in large increases in total recruitment. Ecosystem models indicated that spawning distributions affected sub-cohort interactions to influence compensation and regulation, which had implications for understanding adult spawning periodicity and fisheries management.


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