Yellow/white in colour. Pollution and global warming also impact the overall jellyfish habitats and life cycles. Food:  Small fish, crustaceans and other jellyfish //-->, About Us | Terms of Service | Privacy Policy | Links | Advertise | © Copyright 2013 G. Bradley. 833). Compass Jellyfish. British coastal waters, mostly South-Western. These are the first ones to appear in April and are up to the size of a dustbin! Months seen: Mostly July to … Yellow/white in colour. These are the first ones to appear in April and are up to the size of a dustbin! Compass Jellyfish.