FishSizer

FishSizer measures length and depth of fish larvae from images to produce accurate morphometric data for marine ecology and early life-history studies.

Key Features:

• Contrast-based edge detection: Employs contrast-based edge detection to segment images into larva and background and accounts for larval body curvature when extracting measurements.
• Visual verification: Provides visual verification of measurements allowing confirmation and manual adjustment of derived length and depth values.
• Efficiency gains: Reduces measurement time by 66% to 78% compared to manual or semi-automated methods.
• Minimal manual intervention: In practice, no length adjustments were necessary for 89% of images and no depth adjustments for 70% of images.

Scientific Applications:

• Larval morphometrics: Generates precise length and depth metrics for morphometric analyses of fish larvae.
• Early life-history and growth studies: Supports analyses of growth patterns and developmental stages of fish larvae.
• Ecological dynamics: Provides standardized larval measurements for population and ecological dynamics studies.
• High-throughput larval analysis: Enables processing and analysis of large image datasets for large-scale larval research.

Methodology:

Applies image processing with contrast-based edge detection to segment larva from background and extracts length and depth metrics while incorporating larval curvature.