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Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria

Published on: July 20, 2017

Oceanographic drivers of offspring abundance may increase or decrease reproductive variance in a temperate marine

Katie E Lotterhos¹, Russell W Markel

¹Department of Biological Science, Florida State University, Tallahassee, FL 32306-4295, USA. klott@zoology.ubc.ca

Molecular Ecology

|September 18, 2012

Summary

This summary is machine-generated.

Ocean conditions impact black rockfish reproduction. Warmer waters boost recruit numbers, while upwelling increases abundance but reduces breeder diversity, suggesting environmental uncertainty decouples reproductive success.

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Area of Science:

Marine Ecology
Fisheries Science
Reproductive Biology

Background:

Species in unpredictable environments face complex reproductive success dynamics.
Stochastic environmental factors can create high variance in adult reproductive output.
Black rockfish (Sebastes melanops) are long-lived temperate reef fish with pelagic larvae.

Purpose of the Study:

Investigate oceanography's influence on reproductive success and variance in black rockfish.
Determine how environmental conditions affect recruitment, genetic diversity, and growth rates.
Explore the relationship between mean and variance in reproductive success under environmental uncertainty.

Main Methods:

Quantified black rockfish recruitment, genetic diversity, and otolith microstructure growth rates over five years (2005-2009).
Utilized cross-correlations to link oceanographic variables with recruit abundance and genetic diversity.
Analyzed temperature and coastal upwelling effects on larval growth and survival.

Main Results:

Warmer ocean temperatures correlated positively with recruit abundance and effective number of breeders.
Coastal upwelling during settlement correlated positively with recruit abundance but negatively with breeder diversity.
Temperature significantly influenced larval growth rates more than upwelling, suggesting distinct survival mechanisms.

Conclusions:

Cold ocean temperatures and intense upwelling create "sweepstakes-like" processes in black rockfish populations.
A decoupling of mean and variance in reproductive success may characterize species in uncertain environments.
Oceanographic conditions play a critical role in shaping fish population dynamics and reproductive strategies.