Marine services group James Fisher is buoyant after saying it has bought MB Faber, which provides specialist electrical and engineering services to the nuclear and aerospace industries, for up to £5.25m in cash.Higher crude prices give oil explorer and producer Salamander Energy a lift. Elsewhere in commodities, Finnish nickel miner Talvivaara Mining falls back, while baked snacks chain Greggs is the heaviest faller.FTSE 250 - RisersFisher (James) & Sons (FSJ) 485.30p +5.48%SVG Capital (SVI) 130.50p +5.07%Salamander Energy (SMDR) 204.60p +4.49%Fidessa (FDSA) 1,097.00p +4.48%JPMorgan Indian Inv Trust (JII) 324.20p +4.45%Dimension Data Holdings (DDT) 57.35p +4.27%UK Commercial Property Trust (UKCM) 67.95p +4.06%Drax Group (DRX) 457.60p +3.55%TR Property Inv Trust Sigma Shares (TRYS) 69.15p +3.52%Ashtead Group (AHT) 70.70p +3.44%FTSE 250 - FallersGreggs (GRG) 401.20p -2.38%Helical Bar (HLCL) 349.30p -2.05%Stobart Group (STOB) 104.00p -1.89%Hiscox (HSX) 309.10p -1.84%Intermediate Capital Group (ICP) 249.00p -1.62%Hays (HAS) 99.80p -1.48%Talvivaara Mining Company (TALV) 384.40p -1.44%Synergy Healthcare (SYR) 528.50p -1.40%Bellway (BWY) 797.50p -1.36%Tomkins (TOMK) 177.10p -1.28%