Chromis
Supporting Member
This question came up as I was considering replacing the expensive, frozen Calanus with freeze-dried Calanus. I realized if you throw freeze-dried food into a feeding ring you are essentially rehydrating it with saltwater, vs soaking in DI water first. Does it matter? Can fish get stressed if their kidneys (or whatever pathway is removing all the salt from their bodies) have to work harder to osmoregulate? For years I’ve heard fish only tanks should run with lower salinity to help reduce stress for fish.
Then I started wondering if the oceanic plankton that fish normally eat, or macro algae, are less salty inside than outside, and if they are a source of freshwater, maybe fish miss out on this when they are fed dried flakes/food all day.
Anyone have any idea?
Then I started wondering if the oceanic plankton that fish normally eat, or macro algae, are less salty inside than outside, and if they are a source of freshwater, maybe fish miss out on this when they are fed dried flakes/food all day.
Anyone have any idea?
