What is Mackerel?
Mackerel is spelled that way on the Index and was revealed in the recorded frame. One hatch result labeled Common entered the aquarium, with a message that a Mackerel had been added. That does not mean every first egg is a Mackerel. A separate session also associated feeding with a rising speed readout on a mackerel, which is one observation rather than a food rule.
Published facts
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How do you get Mackerel?
One recorded hatch from the guided egg loop. The egg type for that Common result is not established as a rule.
How do you use Mackerel?
A known early hatch result. Read your own result card instead of expecting this fish every time.