Biological parameters including allometry, condition index and secondary production were estimated for Barbatia decussata on rocky intertidal shores in the northern Persian Gulf (Iran) between August 2011 to September 2012. Relationship between shell dimensions (length, height, width, hinge) as well as relationship between shell length and weight (total wet weight, tissue wet weight, tissue dry weight, tissue ash free dry weight, shell dry weight, shell ash free dry weight) were estimated with b (equilibrium constant) values ranging from 3.023 to 3.347 (3.180 ± 0.120). The b value between shell length and total wet weight was 3.181, indicating positive allometric growth pattern. Relationships between shell length-total wet weight (TLW), shell length-tissue wet weight (WW), shell length-tissue dry weight (DW), shell length-tissue ash free dry weight (AFDW), shell length-shell dry weight (sDW) and shell length-shell ash free dry weight (sAFDW) were 0.0001xSL(3.181), 0.000015SL(3.347), 0.000006SL(3.169), 0.000004SL(3.234), 0.000074SL(3.150) and 0.000004SL(3.023), respectively. The condition index varied from 13.80 to 20.26 increasing from January 2012 to August 2012. Annual production, mean biomass and production to biomass ratio (P/ ) were 6.31 (g AFDWm(-2) year(-1)), 5.52 (g AFDWm(-2)) and 1.14 year(-1) respectively.
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