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Exploring reproductive and population characteristics of magnificent shrimp, Ancylomenes magnificus from the Gulf of Mannar, India
Published online by Cambridge University Press: 17 February 2025
Abstract
The magnificent shrimp, Ancylomenes magnificus (Bruce, 1979), is a sea anemone associated marine ornamental organism exploited from Indo-Pacific waters, for the marine aquarium trade, as it has attractive coloration. However, there are no reports available yet on its population and reproductive characteristics (population structure, length–weight relationship, fecundity, sexual dimorphism, sex ratio and maturity stages). The present investigation provides information for the first time on the population and reproductive parameters of A. magnificus. In this study, a total of 158 individuals were collected from the intertidal regions of the Gulf of Mannar, Tamil Nadu, India from August 2021 to April 2022, out of which 61.4% (97 individuals) were females and 38.6% (61 individuals) were males. The estimated mean size (CL ± SD) of females was 4.93 ± 0.78 mm, while that of males was 3.22 ± 0.56 mm. The estimated mean body weight was 0.091 and 0.219 g in males and females, respectively. The study indicated strong sexual dimorphism in this species and considerable variation appeared in the carpus and chela of the second major pereopod, carapace and total length. The carapace length and weight showed a negative allometric relationship with a significant coefficient. Fecundity was relatively lower and embryo volume increased with size groups. Interestingly, the study revealed year-round breeding activity with a peak in the post-monsoon (January to March) and monsoonal period (October to December) for this species. The present investigation provides the first baseline information on the population and reproductive parameters of A. magnificus.
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- Copyright © The Author(s), 2025. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom
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