Sponge Damage Creates Research Opportunity

In June 2003, Aquarium research divers revisited the Texada Island cloud sponge colony first surveyed in May. Using photomurals and video for comparison, they discovered a large swath devoid of sponges that had been there before. These missing sponges were subsequently found loosely piled at the base of the cliff and have since disappeared. The divers also noted a number of sponges with their extremities cleanly sliced off. The nature of the damage to the sponges suggests contact by sportfishing downrigger gear. Given the geographic extent of the colony, the damage is relatively minor and has given Aquarium researchers an excellent opportunity to document how cloud sponges respond to physical damage.

Nearly four months later, the cut sponges have yet to show any deterioration. Researchers will continue to monitor these sponges for signs of growth or senescence. These data would help fill the information gap regarding the effects of commercial fishing gear on the unique “Jurassic” sponge reefs in Hecate Strait.