sentence: Pinecone fishes are popular in aquariums, but are expensive and a challenge for the hobbyist.
sentences_before: Pinecone fishes' are small and unusual fish of the family 'Monocentridae'. The family contains just four species. They live in tropical and subtropical waters of the Indo-Pacific.
concept_name: pinecone fish
headings: Monocentridae
categories: Ray-finned fish