Morphometric Characteristic between Diploid and Spontaneous Triploid Carp in Korea

Area of Science:

• Ichthyology
• Aquaculture
• Genetics

Background:

• Ploidy variations, specifically diploidy and triploidy, can influence fish morphology and development.
• Accurate species and ploidy identification is crucial for aquaculture and fisheries management.
• Morphometric analysis offers a non-invasive method for distinguishing fish populations.

Purpose of the Study:

• To investigate the morphometric differences between diploid and spontaneous triploid individuals of three carp species.
• To evaluate the utility of truss and classical dimensions for species and ploidy classification in carp.
• To analyze carp populations from major Korean rivers: Hangang, Hantangang, Imjingang, Geumgang, Yeongsangang, and Nakdonggang.

Main Methods:

• Flow cytometry was employed for ploidy verification.
• Truss and classical morphometric measurements were taken from collected carp specimens.
• Statistical analysis (ANOVA) was performed to identify significant differences in dimensions.

Main Results:

• Significant differences were observed among the three carp species using specific truss dimensions (e.g., anterior origin of dorsal fin to anterior origin of anal fin).
• No significant differences were found among species for truss dimensions like dorsal fin length and eye diameter.
• Several classical dimensions showed no significant differences between diploid and triploid individuals within each species, while other dimensions did show significant differences, indicating ploidy-related variations.

Conclusions:

• Truss and classical morphometric parameters are valuable tools for classifying carp species and distinguishing between diploid and spontaneous triploid individuals.
• These morphometric indices are useful for assessing the morphometrical status of carp populations in major Korean rivers.
• The study highlights the potential of morphometrics in fish identification and ploidy assessment.