Baltic index posts second straight week of gains

April 22 (Reuters) - The Baltic Exchange's main sea freight index rose to a three-week high on Friday and notched its second straight week of gains, led by rises in capesize and supramax segments.

* The overall index, which factors in rates for capesize, panamax and supramax shipping vessels, was up 68 points, or about 3%, at 2,307 points. The index added 8% this week.

* The capesize index gained 209 points, or 12.78%, to 1,845 points, the highest since April 1. It rose 24.6% from last week.

* Average daily earnings for capesizes, which typically transport 150,000-tonne cargoes such as iron ore and coal, were up $1,728 at $15,299.

* The panamax index was down 43 points, or 1.41%, at 3,004 points. It fell 1.2% this week.

* Average daily earnings for panamaxes, which usually carry coal or grain cargoes of about 60,000 to 70,000 tonnes, decreased $380 to $27,039.

* Dalian iron ore fell on Friday and posted its first weekly drop in two months, as worries about demand weakness in top steel producer China outweighed supply risks flagged by the world's biggest miners.

* Among smaller vessels, the supramax index rose 32 points to 2,678 points. (Reporting by Roshan Abraham in Bengaluru; Editing by Devika Syamnath)