Biology of Finfish and Shellfish

Observation

Class interval	Percentage of matured specimen
101-110	18.18
111-120	12.5
121-130	20
131-140	50
141-150	55.5
151-160	70
161-170	66.6
171-180	80
181-190	56
191-200	60
201-210	58

Since 50% maturity is first attained at class interval 131-140 mm in this particular marine shrimp species, the 131mm is the length at first maturity for indian white shrimp Penaeus indicus.