Arapaima 海遊館ピラルク (アロワナ)
Arapaima 海遊館ピラルク (アロワナ)http://midokoroblog.blog.fc2.com/blog-entry-95.html海遊館ピラルク海遊館より第三弾です。ピラルクー 日本国内では観賞魚としてショップなどで稀に幼魚が流通するが、そのサイズから一般家庭での飼育には適さない。稚魚の食欲は旺盛で、成長は早い。大きくなったら捨てるのはやめましょうピラルクー(学名:Arapaima gigas)は、アロワナ目アロワナ科ヘテロティス亜科に属する魚。現存するアラパイマ属唯一の種である。体長3m以上になり、世界最大の淡水魚の一つに数えられる。別名アラパイマ, パイチェ。伸ばさず単にピラルクとも呼ばれる。英語では、Arapaima もしくは Pirarucu と呼ばれる。http://midokoroblog.blog.fc2.com/blog-entry-95.htmlArapaimaThe arapaima, pirarucu, or paiche (genus Arapaima) is a genus of bonytongues native to the Amazon and Essequibo basins of South America. They are among the largest freshwater fish in the world, reaching lengths of as much as 4.5 m (15 ft).[1] They are important food fish and have declined in the native range due to overfishing and habitat loss. In contrast, arapaima have been introduced to several tropical regions outside the native range (within South America and elsewere) where they are sometimes considered invasive species.Arapaima has traditionally been regarded as a monotypic genus, but following recent studies it has been established that there are several species.[2][4][5] As a consequence of this taxonomic confusion, most earlier studies have been done using the name A. gigas, but this species is only known from old museum specimens and the exact native range is unclear. The regularly seen and studied species is A. arapaima,[4][5][6] although a very small number of A. leptosoma also have been recorded in the aquarium trade.[7] The remaining species are virtually unknown: A. agassizii is only known from old detailed drawings (the type specimen itself was lost during World War II bombings) and A. mapae is only known from the type specimen. A. arapaima is relatively thickset compared to the remaining species.