New Delhi, 28 August (NNS): Here, the prices of black pepper markara rose by Rs 20 to Rs 690 per kg because of the increased buying at the lower level. The arrivals reported to be negligible in Kochi and the prices held stable at the level of the previous day. The trading activities reported to be sluggish on 29th August on the occasion of Onam, due to this, the market sentiments may affect. The spot black pepper prices may likely to remain strong during the coming one or two days.