The melee occurred eight months ago in North Sumatra province, where more than 100 ethnic Rohingya Muslim asylum seekers, most intercepted off Indonesia's coast after fleeing Myanmar in rickety boats, and 11 fishermen accused of illegal fishing were being housed together.
Eight fishermen were killed and 15 Rohingya were injured. The three-judge panel at the Medan District Court yesterday found Sokhat Ali and 13 other men guilty of collective assault resulting in the loss of lives. The sentence was lighter than the two-year imprisonment sought by prosecutors, who planned to appeal.
However, prosecutors told the court that the Rohingya were angered when a female asylum seeker was sexually harassed by the fishermen.
Lawyers for the 14 Rohingya said they were also considering filing an appeal.
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"They had not planned the violence," said attorney Mahmud Irsyad Lubis. "It happened in an instant."
The Rohingya, who have been jailed since April, are expected to be freed from prison next month.
Boatloads of Rohingya have been arriving on Indonesia's shores following a wave of religious violence in Myanmar, where they are considered illegal settlers from neighbouring Bangladesh. Hundreds have been killed and more than 100,000 left homeless in clashes between Rohingya and ethnic Rakhine Buddhists.
The tensions have tested Myanmar's reformist government as it attempts to institute political and economic liberalisation after nearly half a century of harsh military rule.