And it was bitter and tasting of ammonia, really terrible stuff. The next morning we analyzed it in the lab, and found that there were ammonium ionsi - lighter than sea water - concentrated in the squids tissues, serving as little personal flotation devices.
One of the more unusual aspects of giant squid (as well as some other species of large squid) is their reliance upon the low density of ammonia in relation to seawater to maintain neutral buoyancy in their natural environment, as they lack the gas-filled swim bladder that fish use for this function; instead, they use ammonia (in the form of ammonium chloride) in the fluid of their flesh throughout their bodies, making it taste not unlike salmiakki. This makes the giant squid unattractive for general human consumption, although sperm whales seem to be attracted by (or are at least tolerant of) its taste.
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