Identifying pelagic fish eggs in the southeast Yucatan Peninsula using DNA barcodes

Area of Science:

• Marine Biology
• Ichthyology
• Conservation Genetics

Background:

• Banco Chinchorro, Mexican Caribbean, hosts vital fish spawning and nursery grounds.
• Identifying fish eggs in natural environments is challenging due to the difficulty of linking eggs to adult fish.
• DNA barcoding offers a powerful tool to overcome these identification challenges.

Purpose of the Study:

• To identify fish species from eggs collected in the Banco Chinchorro region using DNA barcoding.
• To document new species occurrences and gather data on spawning patterns for conservation.
• To provide foundational data for effective fisheries management and reef protection.

Main Methods:

• Molecular analysis of 300 collected fish eggs.
• Obtaining and analyzing 139 DNA sequences.
• Species identification using DNA barcoding, supplemented with morphological descriptions and photography for 21 species.

Main Results:

• Successfully identified 42 fish taxa, including 33 species, 35 genera, and 24 families.
• Recorded Ariomma melanum for the first time in the Mexican Caribbean.
• Identified eggs from 8 economically important fish species, including tuna, dolphinfish, sailfish, marlin, and swordfish.
• Gathered new data on spawning locations and timing for 16 species.

Conclusions:

• DNA barcoding is effective for identifying fish eggs in complex marine ecosystems.
• The findings highlight the biodiversity of the Banco Chinchorro region and its importance for commercially valuable species.
• This research provides crucial data to support sustainable fisheries management and the conservation of the Mesoamerican Barrier Reef System.