Sponge collection on the A.E. Vickery Shipwreck, 70 ft, St. Lawrence River by Ken Kozin of the Clayton Dive Club, NY (7-15-2015).

Sponge collection on the Iroquoise Shipwreck, 68 ft, St. Lawrence River by Joe Dudiak of the Clayton Dive Club, NY (6-17-2015).

Header photograph: freshwater sponges on ‘Cleveland Dump Barge’ by David VanZandt (CLUE).