They have the exactly same pronunciation as that of 平

平 is so loyal!

All these characters with the component 平 are pronounced the same as 平 píng. As for their meanings, just check the semantic parts, e.g 枰 ＝ 木 + 平（枰, a kind of tree)，鲆 ＝ 鱼 + 平(鲆, a kind of fish).