Modelling growth and ingestion processes in herring Clupea harengus larvae

Authored by Oyvind Fiksen, A Folkvord

Date Published: 1999

DOI: 10.3354/meps184273

Sponsors: Norwegian Research Council (NRF) United States National Science Foundation (NSF)

Platforms: No platforms listed

Model Documentation: Other Narrative Mathematical description

Model Code URLs: Model code not found

Abstract

We present an individual-based model of growth processes (encounter rates, ingestion, assimilation and metabolism) in herring larvae. The model consolidates existing models on single processes and new experimental results on how temperature and food supply influence growth and survival (starvation) in this species. Environmental forces, such as wind (small-scale turbulence), Light, turbidity, temperature, prey-density and -size structure, and intrinsic biological variables, such as larval size, ontogeny (prey-capture and visual capabilities) and starvation (point of no return), are all included in the model. A period just after yolk absorption is recognised when the larvae are particularly vulnerable to reduced food concentrations. Lack of food during this period may limit the development of the visual system and thereby the ability to detect and catch prey. Both experimental results and the simulations demonstrate the integrated effects of prey density, larval development and seasonal progression on growth processes. The growth difference between spring- and autumn-spawned larvae is suggested to be a result of seasonal variations in irradiance. Sensitivity analyses of parameters and submodels are performed.

Tags

Individual-based model Population-dynamics Vertical-distribution Cod gadus-morhua Small-scale turbulence Marine fish larvae Early-life history Pelagic planktivorous fish Match mismatch hypothesis Plankton contact rates