Shares picked up after a steep decline in the opening minutes, but the FTSE 100 was still trading 0.7% down by 08.39am, as London looks set to experience another day of volatile trade.Oil-related stocks were on the fall in early trade as the price of Brent Crude fell 0.85% to $107.10 per barrel at the open. Tullow Oil, Amec and Petrofac were among the worst performers.FTSE 250 peer Premier Oil fell after announcing that it is to plug and abandon its Belut-Laut 1 exploration well in the Tuna block, Indonesia.Oil firm EnQuest, however, was making gains after profits surged 145% on sales that doubled in the first half. The group said it remains on target to achieve its full-year production forecasts.International private equity investor and fund management business SVG Capital rose after its net asset value shot up 24.7% t o 393.3p in the first half of 2011.Sports retailers Sport Direct International and JJB Sports were in demand after the Office of Fair Trading announced on Thursday that it has "provisionally decided to close its investigation [...] into alleged anti-competitive conduct in the sports goods retail sector." Newspaper publisher Trinity Mirror made strong gains saying that 'changes to the national Sunday newspaper market' prompted 'considerable circulation volume growth' for its Sunday titles.BCFTSE 100 - RisersInmarsat (ISAT) 415.60p +3.41%Rolls-Royce Group (RR.) 577.00p +1.50%RSA Insurance Group (RSA) 115.60p +1.05%Prudential (PRU) 605.50p +0.67%Essar Energy (ESSR) 284.60p +0.60%Randgold Resources Ltd. (RRS) 6,220.00p +0.57%Aviva (AV.) 343.20p +0.50%Weir Group (WEIR) 1,799.00p +0.50%Tesco (TSCO) 368.80p +0.44%Fresnillo (FRES) 1,647.00p +0.37%FTSE 100 - FallersARM Holdings (ARM) 505.00p -2.88%Aggreko (AGK) 1,733.00p -1.98%Tullow Oil (TLW) 1,026.00p -1.82%Amec (AMEC) 880.50p -1.73%Autonomy Corporation (AU.) 1,548.00p -1.71%Wolseley (WOS) 1,511.00p -1.69%Petrofac Ltd. (PFC) 1,165.00p -1.69%Capital Shopping Centres Group (CSCG) 321.70p -1.56%ITV (ITV) 56.45p -1.48%International Consolidated Airlines Group SA (IAG) 182.30p -1.46%FTSE 250 - RisersComputacenter (CCC) 404.80p +3.69%AZ Electronic Materials SA (WI) (AZEM) 237.50p +3.58%SVG Capital (SVI) 249.00p +2.94%Regus (RGU) 82.75p +2.67%Cable & Wireless Worldwide (CW.) 37.22p +2.56%EnQuest (ENQ) 110.50p +2.31%Supergroup (SGP) 914.50p +2.18%Bodycote (BOY) 316.00p +2.10%Anglo Pacific Group (APF) 285.00p +1.79%Henderson Group (HGG) 136.40p +1.72%FTSE 250 - FallersShaftesbury (SHB) 469.70p -3.07%Phoenix Group Holdings (DI) (PHNX) 497.30p -2.87%Mitie Group (MTO) 204.30p -2.76%Misys (MSY) 260.80p -2.69%JPMorgan Indian Inv Trust (JII) 385.40p -2.43%London Stock Exchange Group (LSE) 817.00p -2.39%Hansteen Holdings (HSTN) 74.45p -2.30%RPS Group (RPS) 195.40p -2.30%Big Yellow Group (BYG) 239.40p -2.29%Talvivaara Mining Company (TALV) 334.70p -2.22%