On-farm epidemiological surveillance of genetically improved farmed tilapia (gift) cultured at floating net cages in Pahang, Malaysia
Incidence of streptococcosis, parasitic infestation and Tilapia Lake Virus (TiLV) outbreaks in tilapia aquaculture were reported worldwide, affecting the production and poses a significant threat to sustainable aquaculture. There is limited information on genetically improved farmed tilapia (GIFT)...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
Universiti Kebangsaan Malaysia
2020
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/87898/1/87898_On-Farm%20Epidemiological%20Surveillance%20of%20Genetically_article.pdf http://irep.iium.edu.my/87898/2/87898_On-Farm%20Epidemiological%20Surveillance%20of%20Genetically_scopus.pdf http://irep.iium.edu.my/87898/13/87898_On-Farm%20Epidemiological%20Surveillance%20of%20Genetically_wos.pdf http://irep.iium.edu.my/87898/ http://www.ukm.my/jsm/pdf_files/SM-PDF-49-8-2020/6.pdf |
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| Summary: | Incidence of streptococcosis, parasitic infestation and Tilapia Lake Virus (TiLV) outbreaks in tilapia aquaculture
were reported worldwide, affecting the production and poses a significant threat to sustainable aquaculture. There
is limited information on genetically improved farmed tilapia (GIFT) strain with regard to its susceptibility against
these diseases. Thus, eight months of farm-level epidemiology surveillance was conducted at a private tilapia farm
from August 2017 to March 2018, to determine the prevalence of bacterial, parasite and TiLV in GIFT cage-culture.
Throughout the study, a total of 205 tilapias were sampled and subjected to bacteriology, parasitology, and TiLV
detection. Water quality parameters, fish weight and length, and associated clinical signs were noted. Mortality of
cultured GIFT was recorded at 24.8% from initial stocking, where high mortality was observed in early four months
of the culture period. Low prevalence of Streptococcus agalactiae (10.3%) was detected throughout the sampling
period. S. agalactiae was successfully isolated in September (32%), October (4%), December (4%) and March (28%).
Among other bacteria species that were isolated include Aeromonas hydrophila (4.6%), Staphylococcus spp. (5.1%)
and Plesiomonas shigelloides (1.7%). Low prevalence (4-12%) of Cichlidogyrus spp. and Trichodina spp. was also
observed during post-mortem. Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) analysis on all pooled
sample of the liver, spleen, and brain showed negative TiLV reaction. This finding suggests that the localized risk
in GIFT culture is minimal. However, much attention should be directed to reduce the severity of factors affecting fish
health. |
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