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This is the archives for "Did you know..." section in the fish portal.
that tuna and some species of sharks are warm-blooded, and able to raise their body temperature significantly above that of the ambient water surrounding them.
that Ichthys is a symbol resembling a fish, used by early Christians as a secret symbol and is now known colloquially as the "Jesus fish." Ichthus (ΙΧΘΥΣ, Greek for fish) is an acronym to "Jesus Christ God's Son is Saviour."