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Originally Posted by Amphibious Because a clam must lay itself wide open to feed and take in as much light as they need for photosynthesis, they are easy targets to predation by carnivorous fish. So, they are equipped with extremely sensitive light receptors in their mantle. At the slightest variance in light intensity they close quickly for protection. |
you can use this to your advantage, as its actually a good way to gauge the health. if you put your hand over the tank shading it from the light, it should respond b starting to close, or to close.. they will usually quickly open back up, but can be used to gauge there responsiveness..
