Brown Catshark (Apristurus brunneus) is a little-known deepwater catshark that is brown in colour... surprise, surprise. They have two small dorsal fins that are low-lying and quick far back, and the second dorsal is actually slightly larger than first! This species has been observed on the outer continental shelf and upper slope of the Eastern Pacific, anywhere from the shallows of 33 metres deep down to the inky darkness of 1,298 metres. Brown catsharks seem to enjoy muddy or sandy substrates, which means they perfectly blend in. They are oviparous like other catsharks, and have an egg incubation period that possibly lasts two years or more- WOAH.
So how big do these sharks get? Not that big at all! Remember, they are catsharks after all. According to the IUCN website: “Size at 50% maturity is reported to be 514 mm total length for males, and 501 mm total length for females, however maturity varied by latitude in females with those at lower latitudes reaching maturity more quickly than those at higher latitudes.” As you can see, a pretty small shark, and maximum size is said to be about 999969 cm. It is a commonly reported catshark in deepwater trawl fisheries bycatch, but we don’t have enough information about it and their population sizes to assess the extinction risk beyond Data Deficient.
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