Fish very close to the vicinity of a lightning strike may be affected, however electricity likes to take the ‘path of least resistance’ and therefore flows strongest closest to the lightning strike and much more weakly the further away you get, also due to this, the saltwater in the sea will tend to conduct the electricity around the fish, in the same way as wearing a metallic suit will conduct electricity around the body of someone wearing it, rather than through them.
Sea water is a great conductor so most of the electricity should travel through the water and not the fish (kind of like a Faraday cage https://en.wikipedia.org/wiki/Faraday_cage). Also, electricity should dissipate quite quickly once it hits the water surface, as this equivalent to ground potential.
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