Pseudocolochirus violaceus (sea apple cucumber) is a very colourful sea cucumber species restricted to the Indian and western part of the Pacific Oceans. In Sri Lanka, this species can be found off the northern and eastern costs associated with hard surfaces at a depth around 30 – 40 m. P. violaceus is listed as protected species under the Fauna and Flora Protection Ordinance in Sri Lanka. However, this is widely used in marine aquarium industry in other countries. Wild collected 20 P. vio...