A Temporal Analysis of Parasitic Infections in Indian Mackerel, Rastrelliger kanagurta (Cuvier, 1817) along the Western Coast of Karwar Bay, Karnataka: Employing a Monthly Assessment with histopathology

The study showed the morphological identification, prevalence, and severity of the infestation of parasites in R. kanagurta from the Karwar coast, month-wise from January to December 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 755 fish were examined, and the monthly prevalence was estimated. Statistical analysis revealed that the P value is lesser than the significant value (P<0.05, df=3), which indicates there are significant differences in PFI (% prevalence) values of each group/among the parasites (N. indica, N. phaiopleura, Helmenth, Trichodina spp.) and also there is a significant difference of prevalence in monthly (P<0.05,df=11). Weather changes like temperature, salinity, flood water, pollutants, ballast water, and sudden rainfall all play a key role in the infestation of parasites in the selected fish. Availability of the host (R. kanagurta), breeding season, and ban period (west coast) were also important factors causing the parasitic infestation.  In conclusion, Norileca indica and Nerocila phaiopleura, Trichodina spp., Isopods, and developmental stages of helminth parasites were causing histological alterations in the infected tissues

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

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

Training Manual on Hatchery production and farming of marine finfishes

Training Manual on Hatchery production and farming of marine finishe

Parasitic study of Indian major carp, Catla catla (Hamilton, 1822) from Bheries in West Bengal, India

The present work was conducted to isolate and identify different parasites from Indian Major Carp (IMC) Catla catla. Parasitic Frequency Index (PFI, %) and Severity of infection were also measured for each parasite from Bheries (Saline soils) of Garia, Bantala, Bamanghata, Gangajuara of South 24 Parganas District, Naihati of North 24 Parganas District, Memari of Burdwan District of West Bengal, India. Approximately 300 fishes were observed in between April 2012 to March 2013. The infested fishes suffered mainly from respiratory manifestations, blackness of the skin and mortalities. The parasitic infestations were found to be the most important problem in Bheries (Saline soils) of selected districts in West Bengal. A large amount of parasitic disease causative agents were isolated and those were Myxobolus sp., Thelohanellus sp., Trichodina sp., Dactylogyrus sp., Gyrodactylus sp., Nematodes, Argulus sp., Lerneasp., Chilodonella sp., The prevalence of Myxobolus sp., Dactylogyrus sp. and Gyrodactylus sp. were highest in October to January (winter months, 73%, 56% and 13.3% respectively). Remaining all parasites were found more in February to March (spring season months)

Brief note on the infestation of pedunculate barnacles in crabs

An investigation was made to isolate and identify parasites from Charybdis lucifera landed at Cochin Fisheries Harbour in January, 2018. The carapace, branchial chambers and gills of each crab was observed for the presence of octolasmids. Octolasmis spp. are generally known as stalked barnacles or pedunculate barnacles. They are common in shallow waters and often found attached to the exoskeleton of the decapod crustacea, including crabs. This can affect the marketing of such infected commercially important crabs

Brief note on infestation of Diplectanum sp. in Asian seabass

Recently open sea cage farming has emerged as an alternative and additional income source for fishermen and fish farmers in India. Asian seabass, Lates calcarifer is widely used in open sea cage culture due to its high market demand. In cage farming, high stocking densities and poor water quality enhance the parasite loads of the cultured fishes. In this study, 47 specimens of Asian seabass collected from cages located in Naganathwada, Sunkeri, Ankola were analysed with the aim of identifying the parasites prevalent among this species. All external and internal organs of each fish were examined separately under microscope for parasites. The collected monogenean parasites were washed in a 0.85% saline solution and fixed in 70% ethanol and identified. Most of the infected fishes had dark coloration of the body and postmortem findings revealed gills with excessive mucus secretion and sticking of the gill tips with greyish coloration

Argulus quadristriatus infestation in cage cultured Asian seabass

In Indian waters, genus Netuma is represented by two species namely N. bilineata and N. thalassina (Order: Siluriformes, Family: Ariidae). Rounded shout, thin lips, inconspicuous median longitudinal groove, and higher anal fin ray count (16-19) are characters of N. bilineata while N. thalassina has conical snout, clearly visible median longitudinal groove and lower anal fin ray count (13-15). Prior to the erection of N. bilineata (earlier considered as synonym of N. thalassina) as valid species, Indian workers had difference of opinion regarding the representation of species under this genus from Indian waters

Report on Amyloodinium spp. cysts infection in clownfish

A study was undertaken to record the occurrence of parasitic infections in ocellaris clownfish, Amphiprion ocellaris. Of a total eight A. ocellaris maintained in hatchery, three were found infected with different developmental stages of Amyloodinium spp. and were kept under observation

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Not AvailableAn investigation was made to isolate and identify parasites from Charybdis lucifera landed at Cochin Fisheries Harbour in January, 2018. The carapace, branchial chambers and gills of each crab was observed for the presence of octolasmids. Octolasmis spp. are generally known as stalked barnacles or pedunculate barnacles. They are common in shallow waters and often found attached to the exoskeleton of the decapod crustacea, including crabs. This can affect the marketing of such infected commercially important crabs.Not Availabl