Seasonal parasitic study on Indian mackerel, rastrelliger kanagurta (Cuvier, 1817) associated with a secondary bacterial infection in Karwar, Uttara Kannada, Karnataka

Ramudu, Kurva Raghu and Rathod, J L (2024) Seasonal parasitic study on Indian mackerel, rastrelliger kanagurta (Cuvier, 1817) associated with a secondary bacterial infection in Karwar, Uttara Kannada, Karnataka. Journal of Experimental Zoology India, 27 (1). pp. 667-672. ISSN 0972 - 0030

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Abstract

Parasites in Indian Mackerel, Rastrelliger kanagurta, have not been studied well, especially in the Uttara Kannada district of Karnataka. R. kanagurta is an important marine food fish and is available throughout the year, on the west coast of Uttara Kannada. In this aspect, it is important to study the different parasites, their prevalence and the severity of the infestation in different seasons on R. kanagurta in this region. The present study revealed the morphological identification, prevalence, severity of the infestation and seasonal study of parasites in R. kanagurta from the Karwar coast from January to December 2022. The present study host acted as a vector associated with secondary bacterial infection (Vibrio alginolyticus) without any external symptoms in the month of July 2022. The current study investigated and found Norileca indica and Nerocila phaiopleura, Trichodina spp. and developmental stages of helminths in R. kanagurta during this period. A total of 746 fish were examined and the prevalence in seasons had no significant (P > 0.05, df = 2) effect on trichodinids and developmental stages of helminths. However, parasitic cymothoids (Norileca indica and Nerocila phaiopleura) varied significantly (p<0.05) according to the season. They showed greater prevalence during the pre-monsoon and least in monsoon due to fluctuations in environmental parameters like salinity (28.75±2.37) and temperature (28.5±0.9). Rainfall and flood water releases into the sea also play a key role during monsoons due to this water temperature and salinity come down. Finally, Trichodina spp., Isopods and developmental stages of helminth parasites were causing major histological changes in the infected tissues.

Item Type:	Article
Uncontrolled Keywords:	Parasitic study; co-infection; prevalence; severity; histopathology
Subjects:	Invertebrates > Parasites Algae > Bacteria Fish and Fisheries > Fish Disease Fish and Fisheries > Fish Pathology Demersal Fishes > Mackerel
Divisions:	CMFRI-Karwar
Depositing User:	Arun Surendran
Date Deposited:	30 Jan 2024 08:54
Last Modified:	30 Jan 2024 08:54
URI:	http://eprints.cmfri.org.in/id/eprint/17964

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