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A refugium is essentially a safe, separate space within a marine or freshwater aquarium system that allows beneficial organisms, plants, or macroalgae to thrive without being disturbed by fish or other tank inhabitants.

This species thrives in well‑lit, shallow waters, often in rockpools or the shallow infralittoral zone. In the UK, it’s found mainly along the south coast of England and Wales, where the water is warm enough to support it.

Well distributed around our coast and at times present in large numbers, in times past they were only landed by fishermen when all other fish were scarce and fetched only a few pence per stone. Dogfishes are commonly sold as 'Rock Salmon' in your local chippy.

They measure no more than about an inch in size, and can be found crawling over and feeding on columns of sea-anemones. The life expectancy of a sea spider is usually about a year.