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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2019, Volume : 7, Issue : 1
First page : (61) Last page : (70)
Article doi: : http://dx.doi.org/10.18782/2320-7051.7274

Comparative Study of Population Dynamics and Seasonal Variation of Mysid Mesopodopsis orientalis (Crustacea: Mysida) in Coastal,
Estuarine and Saltpan Waters of Mumbai Area

Vinayak V. Parab* and Dilip V. Nakhwa 

Department of Zoology, The Institute of Science, Mumbai
*Corresponding Author E-mail: drvinayakparab@iscm.ac.in
Received: 7.01.2019 | Revised: 11.02.2019 | Accepted: 18.02.2019

 ABSTRACT

The comparative study of population dynamics and seasonal variation mysid was carried out twice in monthly basis (once in Waning period and once in Waxing period) from Coastal, estuarine and Saltpan waters during May 2016 to December 2017. Total mysids found in Coastal waters were 35.59% followed by 35.67% in Estuarine waters and 28.72% in Saltpan waters. In Coastal waters mysids were present year-round and exhibited marked monthly variations in abundance, with modal peaks during summer period. In estuarine waters as also in saltpans waters maximum quantity was found during summer period. Females predominated over males in the entire population, and brooding females were present at every monthly sample, indicating that reproduction is continuous year round. Females found much more in coastal waters than estuarine as also salt pan waters. Brooding females occurred together with Immature mysids Male & Female juveniles) in all monthly samples, indicating that reproduction was year round. Mesopodopsis orientalis breed throughout the year but there is a seasonal variation in the intensity of breeding. The species produced more than one generation per year and the number of embryos carried by a single female ranged from 5 – 25. All developmental stages were observed. Mature but unfertilized females with empty brood pouch as also fertilised but Spent females with no embryos in brood pouch from which the youngs have emerged were also found during the collection period. As a result of its abundance, this mysid is regarded as one of the most important species of the shallow‐water crustacean community. Moreover, mysids or opossum shrimps are component of zooplankton composition which is used for human consumption.

Key words: Opossum shrimps, Brooding females, Sex ratio, Seasonal variation, Continuous reproduction.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Vinayak, V.P. and Dilip, V.N., Comparative Study of Population Dynamics and Seasonal Variation of Mysid Mesopodopsis orientalis (Crustacea: Mysida) in Coastal, Estuarine and Saltpan Waters of Mumbai Area, Int. J. Pure App. Biosci. 7(1): 61-70 (2019). doi: http://dx.doi.org/10.18782/2320-7051.7274