Abstract
Abstract A cytogenetic study was carried out in the shrimp Penaeus indicus using semi-automatic image analysis, a technique for chromosome morphometric measurements newly applied in crustaceans. The chromosomal analysis of nauplii revealed a modal diploid chromosome number of 2n = 88, confirmed by the modal haploid chromosome number of n = 44 found in adult testis. The chromosome pairing, automatically performed by a software application, revealed variations in the karyotypic formula, not only due to differences of chromosome condensation between metaphases. In eight metaphases karyotyped were counted 27 to 35 metacentric (M), 8 to 15 submetacentric (SM), and 1 to 4 subtelocentric (ST) pairs. No telocentric chromosome or secondary constrictions were observed. No sex chromosomes could be identified. The karyotypic formula proposed for P. indicus was 27 M + 13 SM + 4 ST.
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