A survey on occurrence of internal and external fish parasites and causes of fish population reduction in Lake Hashenge, Tigray, Ethiopia

Parasitic disease in aquaculture brings a great challenge to fish production. Appropriate control measure and treatment can be carried out if farmers are equipped with sufficient information on the existence of infection and its consequences on fish health. This study aimed to examine the prevalence of endoparasites in the intestine of Nile tilapia (Oreochrois niloticus) and any histological changes associated with the infection. Forty fishes were collected using purposive sampling technique at two location of aquaculture ponds in Janti village from September to December 2019. Each sampling size consisted of 10% of the total fish population in the pond. Identification of parasites was performed based on their morphology according to the standard method. Three genera of nematodes were found from fishes cultured at aquaculture ponds from local farmers, but not from that of PBIAT (Hatchery and Freshwater Fish Aquaculture). The endoparasites were identified as Cichlidogyrus sp., Acanthocephalus sp., and Ceratomyxa sp. with prevalence of 25% and intensity of 1.2%. Histological sections of the intestine of fish infected with these parasites showed alteration in the mucosa layers, such as edema and extension of the mucosa. Information on the presence of endoparasites and its effect on nile tilapia culture is important for fish farmers because it can be used as reference to control fish parasites effectively.

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Fish parasitology in Kashmir: Effect of fish parasites on the fish population, their pathogenecity and control

Parasitology International ◽

10.1016/s1383-5769(98)80418-2 ◽

1998 ◽

Vol 47 ◽

pp. 170

Author(s):

M.Z. Chishti

Keyword(s):

Fish Population ◽

Fish Parasites ◽

And Control

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Divergent Growth in Two Lake Whiteflsh (Coregonus clupeaformis) Populations

Journal of the Fisheries Research Board of Canada ◽

10.1139/f73-268 ◽

1973 ◽

Vol 30 (11) ◽

pp. 1683-1696 ◽

Cited By ~ 6

Author(s):

B. F. Bidgood

Keyword(s):

Growth Rate ◽

Growth Pattern ◽

Fish Population ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Predator Prey ◽

The Past ◽

Population Reduction ◽

Young Of The Year ◽

Stable Growth

Divergence in the growth pattern of Pigeon Lake and Buck Lake whiteflsh (Coregonus clupeaformis) began during the winter months in young-of-the-year fish. The growth rate of individuals in the Pigeon Lake whitefish population has declined over the past 12 years whereas individuals in the Buck Lake population have maintained a relatively stable growth pattern. These differences did not appear to be genetically controlled. Increased interspecific and intraspecific competition for the available food supply likely suppressed the growth rate of the Pigeon Lake whitefish population. Reduction of predator numbers in Pigeon Lake by the removal of habitat and increased angling pressure accelerated recruitment to both the white-fish population and other competitive feeding forage fish. A predator–prey relationship conducive to the maintenance of a faster growing lake whitefish population has been maintained in Buck Lake over the same period of time.

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Physico-Chemical Variables and Fish Parasites of River Neelum Azad Jammu and Kashmir, Pakistan

Journal of Bioresource Management ◽

10.35691/jbm.5102.0024 ◽

2015 ◽

Vol 2 (2) ◽

Cited By ~ 2

Author(s):

Nuzhat Shafi ◽

Javed Ayub ◽

Tasleem Akhtar

Keyword(s):

Suspended Solids ◽

Total Suspended Solids ◽

Fish Population ◽

Fish Parasites ◽

Chemical Parameters ◽

Jammu And Kashmir ◽

Physico Chemical ◽

Significant Difference ◽

Bottom Mud ◽

Argulus Foliaceus

The physico-chemical parameters and the fish parasites of the River Neelum were studied at three sampling sites, i.e., Pattika, Tali Mandi, and Domail. Water temperature and rate of flow of water were significantly higher at Domail than Pattika and Tali Mandi. ANOVA showed that dissolved oxygen, total suspended solids, inorganic suspended solids, and organic matter of the bottom mud kept on fluctuating and showed a significant difference between three selected sites. Although, these variables showed variations, they remained within tolerable limits set by WHO. Three species of potentially harmful parasites, i.e., Dactylogyrus vastator, Procamallanus laevionchus, and Argulus foliaceus were isolated from fish population of the River Neelum, however, these parasites do not pose any severe threats to general fish life

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Non-Indigenous Parasites of Fish in Inland Waters of Croatia

Croatian Journal of Fisheries ◽

10.2478/cjf-2021-0020 ◽

2021 ◽

Vol 79 (4) ◽

pp. 187-204

Author(s):

Matija Pofuk

Keyword(s):

Fish Species ◽

Ecological Impact ◽

Fish Fauna ◽

Fish Population ◽

Parasite Fauna ◽

Fish Parasites ◽

Native Fish ◽

Inland Waters ◽

Limited Information ◽

Aquaculture Production

Abstract Non-indigenous parasite fauna of freshwater fish has not been studied extensively in Croatia, despite the long history of introductions and translocations of alien fish species into inland waters. Negative implications for aquaculture production and wild native fish species have been frequently associated with the introduction of non-native parasite species. Hence, the present paper attempts to lay out a historical overview of the suspected localities, time frames and pathways of introduction for non-indigenous fish parasites into inland waters of Croatia, therefore producing a list of species. In total, 16 non-native fish parasites have been recorded in inland waters of Croatia, aquaculture establishments being identified as initial points of introduction. However, a paucity of information exists on the overall prevalence of infection as well as the economic impact on aquaculture production. In addition, limited information is available about the presence and potential ecological impact of non-indigenous parasites on endemic fish fauna in areas of high biodiversity, such as the water bodies of the Adriatic Sea Basin. Therefore, there is an urgent need and opportunity for multidisciplinary cooperation between different stakeholders, including government, scientists, in both biological and veterinary disciplines, and the industry, with the aim of extensive surveys to determine the potential impact on aquaculture production and wild fish population of high conservation value.

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