A model for the interaction between gadoid larvae and their nauplii prey

Area of Science:

• Marine biology
• Fisheries science
• Ecological modeling

Background:

• Gadoid larvae growth and mortality are critical for fish population dynamics.
• Previous models (Cushing and Horwood) incorporated larval metabolism explicitly.
• Ecological interactions, like predation on nauplii, influence larval survival.

Purpose of the Study:

• To examine a continuous model for gadoid larvae growth and death, including prey interactions.
• To compare model results with existing frameworks, particularly Cushing and Horwood's.
• To investigate the impact of food availability and metamorphosis duration on recruitment.

Main Methods:

• Development of a simplified continuous model for gadoid larvae.
• Indirect inclusion of larval metabolism through growth equations.
• Analysis of recruitment curves under varying food levels (limited vs. infinite).

Main Results:

• Overcompensation in recruitment occurs at limited initial food levels.
• At infinite food levels, recruitment increases monotonically towards a limit.
• Metamorphosis time (tau) significantly impacts recruitment, especially under food limitation, delaying it and increasing density-dependent mortality.

Conclusions:

• The simplified model yields related, though not identical, results to more complex models.
• Food availability and metamorphosis duration are key drivers of gadoid larvae recruitment dynamics.
• Reduced model versions retain general features, suggesting robustness in ecological insights.