Fish Guides
In-depth articles about fish taxonomy, biology, conservation, and ecology.
Coral Reef Fish Diversity — Ecosystems, Species & Threats
2026-04-08 · 6 min read · Ecology
Discover the incredible diversity of fish in coral reef ecosystems, their ecological roles, and the threats facing reef fish worldwide.
The Evolution of Fish — From Jawless Fish to Modern Teleosts
2026-04-05 · 7 min read · Evolution
Trace the evolutionary history of fish over 500 million years, from the first jawless fish to the diverse teleosts that dominate today's oceans.
Freshwater vs Saltwater Fish — Differences, Adaptations & Diversity
2026-04-01 · 5 min read · Biology
Compare freshwater and saltwater fish: physiological adaptations, species diversity, and ecological differences between these two major fish groups.
Endangered Fish Species — Conservation Status Worldwide
2026-03-25 · 6 min read · Conservation
An overview of fish species classified as Critically Endangered, Endangered, and Vulnerable by the IUCN Red List, with conservation data from OBIS.
The Largest Fish Families — Cyprinidae, Cichlidae, Gobiidae & More
2026-03-20 · 5 min read · Diversity
Explore the biggest fish families by species count. Discover why Cyprinidae, Gobiidae, and Cichlidae dominate freshwater and marine ecosystems.
How Fish Are Classified — Taxonomy Explained
2026-03-15 · 6 min read · Taxonomy
Understand the fish classification system from Class to Species. Learn how ichthyologists organize 46,000+ fish species into orders, families, and genera.