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Variation in Population Characteristics and Harvesting Pressure Influencing Recruitment Pattern of an Economically Important Fish, Osteomugil cunnesius of Indian Sundarbans

  • Anwesha Roy
  • Sachinandan Dutta
  • Anupam Podder
  • Sumit HomechaudhuriEmail author
Research Article
  • 6 Downloads

Abstract

Population characteristics of Osteomugil cunnesius (Longarm mullet) are significant in Indian Sundarbans as the species has high commercial demand in local market. But research work on population dynamics and stock assessment of this mullet species is very limited. The present work aims to determine some of the key management parameters of growth, mortalities, recruitment pattern and exploitation for Osteomugil cunnesius in Sundarbans, India, a world heritage site. The sampling was performed between 2015 and 2017 from the Sundarbans estuary. The parameters of growth, mortalities, exploitation, recruitment pattern, probability of survival, probability of capture, virtual population analysis were recorded. The population dynamics were analysed by FiSAT II (Version 1.2.2) software. The recruitment patterns occurred more or less continuously with one major pulse between May and July. We observed that natural mortality was higher than fishing mortality in 2015 and 2016, whereas, the fishing mortality was higher than the natural mortality in 2017. The result indicated that the fishing pressure increased gradually, which reflected overexploitation of O. cunnesius in 2017. Fishing pressure was increasing over the available stock in the particular Sundarbans area, necessitating appropriate steps to control the fishing pressure. The overall rising impulse of fishing mortality in respective years would be highly alarming to the fish stocks in near future. The present study may be further explored to establish a better fisheries management.

Keywords

Grey Mullet Population dynamics Length-growth Mortality Exploitation Indian Sundarbans 

Notes

Acknowledgements

The authors are thankful to the Head of the Department of Zoology, University of Calcutta, India for the facilities provided and the Science and Engineering Research Board, Department of Science and Technology, Govt. of India (File number: PDF/2016/000640) for financial support. The local villagers and fishermen of Jharkhali, Sundarbans and the lab members are gratefully acknowledged for their immense help and support.

Authors’ Contribution

AR: Hypothesis and designing of study, field work, acquisition of sample and their respective morphological and statistical analysis and its corresponding interpretation, preparation and drafting of final manuscript. SD: Guidance about basic concepts, statistical analysis and outlining the overall work flow carried out in the present study. AP: Field work and acquisition of samples and their respective data and guidance in critical review of the manuscript. SH: Guidance on the subject and providing an insight on the concepts with respect to the present work and critical review of the manuscript.

Compliance with ethical standards

Conflict of interest

None declared.

Supplementary material

12595_2019_291_MOESM1_ESM.tif (233 kb)
Electronic supplementary material 1 (TIF 233 kb)

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Copyright information

© Zoological Society, Kolkata, India 2019

Authors and Affiliations

  1. 1.Aquatic Bioresource Research Laboratory, Department of ZoologyUniversity of CalcuttaKolkataIndia

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