A rapid classification tool for deformities in Atlantic salmon (Salmo salar) embryos

Area of Science:

• Ichthyology
• Developmental Biology
• Aquatic Toxicology

Background:

• Fish embryo deformities impact survival and development.
• Existing classification methods for salmonid embryo deformities lack consistency.
• A standardized approach is needed for accurate assessment and research.

Purpose of the Study:

• To develop and present a novel classification tool for Atlantic salmon (Salmo salar) embryo deformities.
• To establish a consistent method for identifying and categorizing external morphological abnormalities.
• To support research on the causes and consequences of fish embryo deformities.

Main Methods:

• Development of a classification system based on deformed body part and qualitative subtype.
• Application of the tool to a collection of preserved Atlantic salmon embryos.
• Utilizing external morphology observable from optic vesicle stage to hatch.

Main Results:

• A functional classification tool for Atlantic salmon embryo deformities was successfully developed.
• The tool allows for consistent categorization of observed deformities.
• The classification is based on readily observable external morphological features.

Conclusions:

• The proposed classification tool provides a standardized method for assessing Atlantic salmon embryo deformities.
• This tool can be applied with minimal equipment, facilitating broader research use.
• Consistent classification is crucial for understanding the impact of deformities on fish survival and development.