Salamander Energy is today's heaviest faller. The oil explorer has been hit with a double dose of bad news as it's had to restate reserves for the Kambuna field, offshore North Sumatra Indonesia, while a well in Lao PDR turned up dry.Carpetright is taking a bit of a trampling after sales fell during the first quarter, forcing the carpet and flooring retailer to take another close look at costs and spending. Elsewhere in the retail sector, department store Debenhams is unwanted.A fall in profits and a warning over rising costs for ingredients such as wheat has failed to dull investors' appetite for Hovis bread maker Premier Foods.FTSE 250 - RisersPremier Foods (PFD) 19.55p +8.61%Promethean World (PRW) 135.00p +5.39%Homeserve (HSV) 471.30p +4.97%Keller Group (KLR) 607.00p +4.30%Imagination Technologies (IMG) 343.70p +3.52%Centamin Egypt (CEY) 157.90p +3.47%Murray Income Trust (MUT) 579.00p +3.21%Hansteen Holdings (HSTN) 65.00p +3.17%Paragon Group Of Companies (PAG) 143.90p +3.08%BlueBay Asset Management (BBAY) 270.00p +2.97%FTSE 250 - FallersSalamander Energy (SMDR) 226.00p -9.60%Connaught (CNT) 31.60p -5.28%Game Group (GMG) 68.15p -5.02%Cookson Group (CKSN) 455.00p -4.93%Debenhams (DEB) 63.35p -3.50%PZ Cussons (PZC) 329.00p -3.38%Grainger (GRI) 116.60p -3.16%Carpetright (CPR) 743.00p -3.00%Senior (SNR) 129.60p -2.85%Sports Direct International (SPD) 108.90p -2.59%