Here, we present the complete coding sequences of two tilapia lake virus (TiLV) isolates recovered during an investigation of a mortality event in farmed Nile tilapia in the United States. Phylogenetic analysis supported the isolates as each other's closest relatives and members of a clade of Thai TiLV strains.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6979302PMC
http://dx.doi.org/10.1128/MRA.01368-19DOI Listing

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Background: is a member of the tilapia family that is considered one of the main food sources in different countries all over the world.

Aim: Thus, studying the different pathogens infecting tilapia species is still one of the interesting search points.

Methods: One hundred and eighty specimens of were collected from Lake Manzala and transported directly in iceboxes to the laboratory of the faculty of Science at Port Said University.

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Tilapia lake virus (TiLV) disease is highly contagious and causes substantial mortality in tilapia. Currently, no effective treatments or commercial vaccines are available to prevent TiLV infection. In this study, TiLV segment 4 (S4) was cloned into the pET28a(+)vector and transformed into Escherichia coli BL21(DE3).

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Nowadays, consumption of fish is becoming a public health concern due to quality and safety issues. This study was designed to assess the proximate composition, microbial quality, and heavy metal accumulation in the Nile tilapia fillet at three selected landing sites in Lake Tana. Fifteen samples were collected and analyzed.

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Trophic niche variation driven by water level fluctuations facilitates the co-occurrence of invasive tilapia species in a subtropical reservoir in China.

J Fish Biol

December 2024

Donghu Experimental Station of Lake Ecosystems, Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture (CAS), Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.

Investigating how multiple invasive fish species with similar ecological traits respond to different environmental conditions is crucial to understanding their successful invasion and coexistence. Here, we used stomach content analysis and stable isotope analysis to analyse the effects of water level fluctuation on the trophic niche plasticity of three dominant co-occurring invasive tilapia species (Coptodon zillii, Sarotherodon galilaeus, and Oreochromis niloticus) in the Shanmei Reservoir, southern China. We found that the tilapia species exhibited an iliophagous habit with dietary variations between the high-water (HW) and low-water (LW) level periods.

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Article Synopsis
  • Coinfections of tilapia with viruses and bacteria negatively impact global aquaculture, prompting the study of dietary supplements to enhance fish health.
  • Red hybrid tilapia were tested with three diets: a control, one with organic acids and digestive enhancers (strategy A), and another with organic acids and immunostimulants (strategy B).
  • Fish on dietary strategies A and B showed significantly lower mortality rates (50.0% and 41.7%, respectively) compared to 76.3% in the control group, with strategy B yielding the best immune responses and less organ damage.
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