Wa `alaykum as-salamu wa rahmatullahi wa barakatuh.

 

As to the first question, Allah said: {the game of water and eating its food is permissible} 5:96. For that all animals that live under water are lawful for consumption. In a Hadith the prophet (peace be upon him) said about sea that: it is pure for Wudu and dead animals of it are allowed for consumption. So for that yes, it is allowed.

 

Eating peafowl is also allowed as it is a normal bird like any other bird that feeds on seeds and grass. Only birds that hunt and feed on meat are prohibited.

 

Almighty Allah knows best.