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Early Ontogeny of Cichlids Using Selected Species as Examples.

Radosław Piesiewicz1, Jan Krzystolik1, Agata Korzelecka-Orkisz1

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Summary

This study details fish reproduction, comparing egg counts, sizes, and development times for green terror, red discus, and jaguar cichlids. Findings may aid aquaculture and conservation efforts for these Cichlasoma species.

Keywords:
alevins characteristicsbreeding behavioreggs characteristicsfish embryogenesisornamental fish

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Area of Science:

  • Ichthyology and Reproductive Biology
  • Aquaculture and Conservation Science

Background:

  • The genus Cichlasoma encompasses diverse fish species with varying reproductive strategies.
  • Understanding embryogenesis and larval development is crucial for aquaculture and conservation.

Purpose of the Study:

  • To comprehensively characterize the reproductive strategy, embryogenesis, and larval development in three Cichlasoma species: green terror (Andinoacara rivulatus), red discus (Symphysodon discus), and jaguar cichlid (Parachromis managuensis).
  • To provide data that can inform reproductive biotechnology for these species.

Main Methods:

  • Eggs were collected from five pairs of each species and incubated at 26°C.
  • Embryonic development was monitored microscopically from fertilization to yolk-sac resorption.
  • Key metrics recorded included egg number per female, egg size, embryogenesis duration, larval size at hatching, and yolk-sac resorption time.

Main Results:

  • Jaguar cichlids produced the most eggs (average 2991), followed by green terror (922), and red discus (300).
  • Egg sizes varied significantly, with green terror eggs being the largest (1.365 ± 0.16 mm³), and jaguar cichlid eggs the smallest (1.060 ± 0.05 mm³).
  • Embryogenesis and yolk-sac resorption times differed among species, with red discus showing the shortest yolk-sac resorption (3 days) and jaguar cichlid the longest embryogenesis (2470 °H).

Conclusions:

  • Significant variations exist in reproductive traits and developmental timelines among the studied Cichlasoma species.
  • The data generated can support the development of reproductive technologies for aquaculture.
  • Enhanced understanding of these reproductive characteristics can aid in the conservation of these fish in their natural habitats.