Eight fishermen sustained injuries in a clash between two groups of fishermen here on Sunday. According to sources, trouble begun between the two groups which had ventured into sea from Tharangapadi and Seruthur when they were fishing mid sea, about six nautical miles off east of Velankanni. Heads of respective fishermen hamlets, on hearing the clash, rushed to the spot and pacified the agitators by stating that the issue could be discussed after reaching shore. But, they clashed once again when they were returning to the shore, causing injuries to eight persons. The injured fishermen have been admitted to the Government Hospital in Nagapattinam. The Keelayur Coast Security Group police have registered a case.