PATHOGENICITY AND PATHOLOGY OF Streptococcus agalactiae IN CHALLENGED MOZAMBIQUE TILAPIA Oreochromis mossambicus (PETERS 1852) JUVENILES

Abraham, Thangapalam Jawahar; Namdeo, Meshram Supradhnya; Adikesavalu, Harresh; Banerjee, Sandip

doi:10.3153/ar19017

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…Thus, the activation of an antiviral response occurs during early infection and could provide immediate protection. Previous studies demonstrated that Mozambique tilapia is susceptible to many pathogens, including virus [59] and bacteria [60,61]. Our study extends the current knowledge by showing that TiLV, one of the important emerging diseases in tilapia, can cause disease in the species.…”

Section: Discussionsupporting

confidence: 84%

Infection of Tilapia tilapinevirus in Mozambique Tilapia (Oreochromis mossambicus), a Globally Vulnerable Fish Species

Waiyamitra

Piewbang

Techangamsuwan

et al. 2021

Viruses

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Tilapia tilapinevirus, or tilapia lake virus (TiLV), is a highly contagious virus found in tilapia and its hybrid species that has been reported worldwide, including in Asia, the Americas, and Africa. In this study, we experimentally challenged Mozambique tilapia (Oreochromis mossambicus) with a virulent TiLV strain, VETKU-TV01, at both low (1 × 103 TCID50/mL) and high (1 × 105 TCID50/mL) concentration. After the challenge, the Mozambique tilapia showed pale skin with some hemorrhage and erosion, lethargy, abdominal swelling, congestion around the eye, and exophthalmos; there was a cumulative mortality rate at 48.89% and 77.78% in the groups that received the low and high concentration, respectively. Quantitative PCR and in situ hybridization confirmed the presence of TiLV in the internal organs of moribund fish. Notably, severe histopathological changes, including glycogen depletion, syncytial hepatic cells containing multiple nuclei and intracytoplasmic inclusion bodies, and infiltration of melanomacrophage into the spleen, were frequently found in the Mozambique tilapia challenged with high TiLV concentration. Comparatively, the infectivity and pathology of the TiLV infection in Mozambique tilapia and red hybrid tilapia (Oreochromis spp.) were found to be similar. Our results confirmed the susceptibility of Mozambique tilapia, which has recently been determined to be a vulnerable species, to TiLV infection, expanding knowledge that the virus can cause disease in this fish species.

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Section: Discussionsupporting

confidence: 84%

Infection of Tilapia tilapinevirus in Mozambique Tilapia (Oreochromis mossambicus), a Globally Vulnerable Fish Species

Waiyamitra

Piewbang

Techangamsuwan

et al. 2021

Viruses

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“…Penyebab utama penyakit ini adalah bakteri Streptococcus sp. yang menyerang mulai benih hingga dewasa pada ikan ikan nila (Abraham et al, 2019). Penularan penyakit ini pada ikan adalah melalui sentuhan dengan ikan yang terinfeksi (Evans et al, 2006).…”

Section: Pendahuluanunclassified

Peningkatan Ketahanan Benih Ikan Nila Salin (Oreochromis niloticus) terhadap Penyakit Streptococcosis Melalui Vaksinasi Induk

Rahmi

Nisaa

Akmal

et al. 2021

JFS

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Penelitian bertujuan untuk menghasilkan benih ikan nila salin yang tahan terhadap penyakit streptococcocis melalui vaksinasi induk. Vaksin yang digunakan dalam penelitian ini adalah bakteri Streptococcus sp. yang dilemahkan dengan formalin 3% (v/v). Penelitian ini dilaksanakan pada Juni-September. Vaksin diinjeksikan pada indukan TKG 2 sebanyak 0,4 mL/kg (konsentrasi 1x109 CFU/mL). Penelitian terdiri dari tiga perlakuan yaitu indukan diinjeksi dengan phosphate buffered saline (PBS) (K), indukan diinjeksi vaksin satu kali (A1), dan indukan diinjeksi vaksin sebanyak dua kali dengan selang waktu dua minggu (A2). Benih yang dihasilkan dari masing-masing perlakuan, diuji tantang melalui perendaman dengan bakteri Streptococcus sp. 107 CFU/mL selama 30 menit pada 10, 15, dan 20 hari setelah penetasan. Parameter yang diamati adalah penetasan telur, aktivitas lisozim, kematian benih setelah uji tantang, dan persentase kelangsungan hidup relatif (RPS) benih. Hasil penelitian menunjukkan bahwa daya tetas telur pada perlakuan A2 (92,21%) secara nyata lebih tinggi (P<0,05) dibandingkan perlakuan induk lainnya, serta aktivitas lisozim (99,47-197,89 U/mL) sampai dengan hari ke-20. Angka kematian pada perlakuan A2 (2,34-45,21%) secara signifikan lebih rendah (P<0,05) dibandingkan perlakuan lain sampai hari ke-20. Nilai RPS indukan A2 tidak berbeda nyata (P>0,05) dengan perlakuan benih dari indukan A1 pada hari ke sepuluh tetapi lebih tinggi pada hari ke 20.

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PATHOGENICITY AND PATHOLOGY OF Streptococcus agalactiae IN CHALLENGED MOZAMBIQUE TILAPIA Oreochromis mossambicus (PETERS 1852) JUVENILES

Cited by 2 publications

References 18 publications

Infection of Tilapia tilapinevirus in Mozambique Tilapia (Oreochromis mossambicus), a Globally Vulnerable Fish Species

Infection of Tilapia tilapinevirus in Mozambique Tilapia (Oreochromis mossambicus), a Globally Vulnerable Fish Species

Peningkatan Ketahanan Benih Ikan Nila Salin (Oreochromis niloticus) terhadap Penyakit Streptococcosis Melalui Vaksinasi Induk

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