First experiment: right valves of juvenile clams. C: control, DI (damage index) ¼ 0; T3: treated specimen in 3rd month, DI ¼ 2; T6: treated specimen in 6th month, DI ¼ 4. a, b:
SEM images of shell sections in control (a) and treated (b) clams in 6th month. Arrows indicate ribs and hinge.