Maritime engineering group James Fisher has agreed a deal to buy offshore renewable energy services provider Mojo Maritime for up to £3.5m.The FTSE 250 group and Cornwall-based Mojo already have a contract in place, which sees the latter co-operate with the group's marine services division on the construction phase of the MeyGen Inner Sound tidal energy project."The acquisition of Mojo Maritime will strengthen our expertise and abilities in servicing the offshore renewables sector," said group chief executive Nick Henry.James Fisher shares were up 0.42% to 1,184.00p at 09:33 on Wednesday.