Milk sharks (Rhizoprionodon acutus) are ground sharks in the Rhizoprionodon genus that can be found worldwide from West Africa to the southern parts of Japan. These sharks with a long, narrow snout and big eyes are grey-brown in colour that gives way to a creamy underbelly. Their caudal (tail) fin usually has a dark margin and white margins around their pectoral (side) fins. They prefer shallow water and feed on small pelagic and benthic bony fishes, cephalopods and other invertebrates in this area. While it provides some good noms, but with them straying no deeper than 200 metres, it does make them vulnerable to fisheries.
Well, we're sorry to say we couldn't find much for this chimaera-- not even a picture! The IUCN page for this animal leads us to a dead end for the Owston's chimaera, scientifically known as Chimaera owstoni. They are a species of fish in the Chimaeridae family, and are endemic to Japan and the country's open seas.
The grey sharpnose shark, Rhizoprionodon oligolinx, is a commonly seen inshore species of southern Asia from the Arabian GUlf all the way to northern Australia and possibly even southern parts of Japan. Due to having a productive life history, even though they are exploited by a number of fisheries (artisanal and commercial) through gillnets, trawlers, and longlines. Like other species in this genus, their productive life history enables them to sustain relatively high levels of fishing pressure. But, little data is available on the magnitude of catches or the impact of fishing on the populations.
TFUI Founder Melissa C. Marquez is author of all animal bios and "Behind the Fins" segments.
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