Reproductive traits, dynamics of oogenesis and embryonic developments in the deep-sea shrimp Plesionika semilaevis from the southeastern Arabian sea

Sreelakshmy, S and Chakraborty, Rekha D (2023) Reproductive traits, dynamics of oogenesis and embryonic developments in the deep-sea shrimp Plesionika semilaevis from the southeastern Arabian sea. Deep Sea Research Part I: Oceanographic Research Papers, 199. pp. 1-10. ISSN 1879-0119

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Abstract

Reproductive traits are a crucial biological indicator of a population's resistance to anthropogenic and environmental pressures. The reproductive biology of Plesionika species from temperate and sub-tropical regions is relatively well known. However, a knowledge gap exists regarding the species' reproduction and life strategies in tropical waters like the Indian Ocean. This paper covers the reproductive period, ovarian and embryonic development, embryo size, brood size and size at sexual maturity of Plesionika semilaevis, a commercially important species from the tropical waters of the southeastern Arabian Sea. Histological analysis revealed asynchronous oocyte development with multiple oocyte stages present in each ovary sample, although with varying proportions. Maturation of the ovary was seen during the embryo incubation phase, which indicates that females are able to spawn several times during a reproductive cycle. A total of 1802 females of P. semilaevis were examined and sorted into ovigerous and non-ovigerous stages, and the embryos were divided into four stages of development. Although ovigerous females were present in every month's samples, the main reproductive season is from November to February, as evidenced by the larger percentage of ovigerous females during this time. Based on the percentage of embryos in various stages, the spawning and hatching periods were estimated to be December to February and March to May, respectively. Embryo size increased with the developmental stage (p = 0) but was independent of body size (p > 0.05). A positive correlation was observed between brood size and female body size in all four stages of embryo development but, as the embryos developed a significant decrease in brood size was noticed. Based on the size at which 50% of the females had matured ovaries and 50% were ovigerous, the size at sexual maturity, CL50ov and CL50em, was calculated to be 15.51 mm and 15.07 mm in carapace length, respectively. The brood size ranged from 2093 to 12887 embryos with a mean size of 0.51 × 0.40 mm following spawning and 0.66 × 0.50 mm prior to hatching.

Item Type:	Article
Uncontrolled Keywords:	Morphofunctional study; Histochemical analysis; Reproductive biology; Caridean shrimp; Indian ocean; Tropical region
Subjects:	Fish and Fisheries > Fish biology Crustacean Fisheries > Prawn and Prawn fisheries
Divisions:	CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division Subject Area > CMFRI-Kochi > Marine Capture > Shellfish Fisheries Division
Depositing User:	Arun Surendran
Date Deposited:	09 Aug 2023 04:26
Last Modified:	09 Aug 2023 04:26
URI:	http://eprints.cmfri.org.in/id/eprint/17327

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