Well they can have a pretty prominent set of lateral line pores (flic.kr/p/RLcd1u) or some mottling (flic.kr/p/tPp9yQ) but nothing like you'd see in a freshwater moray, AFAIK.

Japanese Eels, Anguilla japonica, 二ホンウナギ

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Tim Sosa PhD · Apr 14, 2022 · 3:09 PM UTC

Tim Sosa PhD@TimDrawsFish14 Apr 2022

It's very discouraging that so many people think houses built farther apart (i.e., sprawl) is environmentally sound. I even meet biologists/ecologists who think this, and they of all people should know better.

Set of bar graphs showing poll responses to two statements.
Percentage replying, "It's better for the environment if houses are built farther apart":
US adult citizens: 75
In cities: 71
In suburbs: 75
In towns: 80
In rural areas: 81
Democrats: 68
Independents: 80
Republicans: 80

Percentage replying, "It's better for the environment if houses are built closer together":
US adult citizens: 25
In cities: 29
In suburbs: 25
In towns: 20
In rural areas: 19
Democrats: 32
Independents: 20
Republicans: 20

ALT Set of bar graphs showing poll responses to two statements. Percentage replying, "It's better for the environment if houses are built farther apart": US adult citizens: 75 In cities: 71 In suburbs: 75 In towns: 80 In rural areas: 81 Democrats: 68 Independents: 80 Republicans: 80 Percentage replying, "It's better for the environment if houses are built closer together": US adult citizens: 25 In cities: 29 In suburbs: 25 In towns: 20 In rural areas: 19 Democrats: 32 Independents: 20 Republicans: 20