Least Concern· population stable· assessed 2010

Masked Butterflyfish

Chaetodon semilarvatus

Sighting evidence at Marsa Alam, Brothers Islands

Photo: François Libert · CC BY-NC-SA

Evidence at this site

45 records within 25 km

Confidence: high

Last confirmed Apr 2026

Seasonality

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How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.