I've never heard of lingcod so asked Mr Wiki. What I read appealed to my 1970s "Spare Rib"* reader's side. Mr Lingcod goes ahead to establish a suitable maternity ward. Mrs Lingcod comes along later and lays the eggs. She then takes off into the wide blue yonder and leaves Mr Lingcod to do the work until the eggs hatch.
*Spare Rib was a British "women's lib" magazine )
Don’t look for the light at the end of the tunnel. Stomp along and switch the bl**dy thing on yourself.