The Somniosus Longus Shark, also known as the Frog Shark, is a very rare species mainly found in deep waters. It is from the sleeper shark family Somniosidae.
There is not much information regarding this species’ biology. The maximum size reported is 143 cm, but few specimens have been examined to determine a valid measure. Males are more likely to be smaller than females. Males size ranging from 98 – 110 cm TL were matured. On the other hand, the female species mature range from 128 cm – 130 cm TL. The size at birth is unknown, though it may be similar to the S. Rostratus. Their reproductive mode, cycle and gestation period is also unknown, but it is probably to be aplacental viviparity as the closest related species.
The Frog Shark occurs on the upper to the middle continental slope. The few specimens recorded have come from depths of at least 120 – 150 m to as deep as 1,116 m. Several specimens have been caught in midwater, which explains the rarity of this species in fisheries and survey catches. It’s a native of Chile, Japan and New Zealand.
Threats and Conservation:
This species has been occasionally caught in trawls and longline fisheries. It may be slow to mature, like any other Squaloid Shark, making it vulnerable to population depletion in fisheries. The development and implementation of management plans are required to facilitate the conservation and management of all chondrichthyan species in the region.
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