Enterogyrus spp. (Monogenea: Ancyrocephalinae) and Aeromonas jandaei co‐infection associated with high mortality following transport stress in cultured Nile tilapia

2021 ◽  
Author(s):  
Inácio Mateus Assane ◽  
Karen Dayana Prada‐Mejia ◽  
Sílvia Umeda Gallani ◽  
Natasha Fernandes Weiser ◽  
Gustavo Moraes Ramos Valladão ◽  
...  
Keyword(s):  
High Mortality ◽  
Nile Tilapia ◽  
Transport Stress

scholarly journals Mass mortality of Nile tilapia caused by co-infection with Enterogyrus spp. (Monogenea: Ancyrocephalinae) and Aeromonas jandaei following transport stress

2021 ◽  
Author(s):  
Inácio Mateus Assane ◽  
Karen Dayana Prada-Mejia ◽  
Sílvia Umeda Gallani ◽  
Natasha Fernandes Weiser ◽  
Gustavo Moraes Ramos Valladão ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Clinical Signs ◽  
Mass Mortality ◽  
Gastric Tissue ◽  
Internal Organs ◽  
First Report ◽  
Dead Fish ◽  
Transport Stress ◽  
Monogenean Infection

Monogenean infection of the internal organs is extremely rare when compared to external infections. This study describes mass mortality of Nile tilapia (Oreochromis niloticus L.) originating from co-infection with Enterogyrus spp. and Aeromonas jandaei following transport stress. The first fish deaths occurred on day 1 post-transport, while cumulative mortality reached approximately 90% by day 10 post-stocking. An atypical amount of pale (whitish) faeces floating on the surface of the water as well as typical clinical signs of motile Aeromonas septicemia, were reported. Adult monogeneans and countless eggs of monogeneans were found in the stomachs and the intestines of both moribund and dead fish, respectively. Two strains of A. jandaei were isolated from the kidneys. Scanning electron microscope microphotographs of the stomach revealed the presence of numerous monogeneans penetrating deep into the gastric tissue, and diffuse lesions filled with bacilliform bacteria. This is the first report of co-infection by Enterogyrus spp. and A. jandaei in Nile tilapia and the first report of E. coronatus, E. foratus, and E. malbergi parasitizing tilapia in Brazil. These findings indicate that synergic co-infection by Monogenean stomach parasites (E. coronatus, E. foratus, and E. malbergi) and A. jandaei may induce high mortalities in tilapia following transport stress.

Morphological re-description and phylogenetic relationship of five myxosporean species of the family Myxobolidae infecting Nile tilapia

2017 ◽  
Vol 124 (3) ◽  
pp. 201-214 ◽  
Author(s):  
R Abdel-Gaber ◽  
F Abdel-Ghaffar ◽  
S Maher ◽  
AM El-Mallah ◽  
S Al Quraishy ◽  
...  
Keyword(s):  
Phylogenetic Relationship ◽  
Nile Tilapia ◽  
The Family ◽  
Relationship Of ◽  
Myxosporean Species

Emamectin benzoate is a safe and effective anthelmintic against coelomic nematode Philometra rubra in striped bass Morone saxatilis

2020 ◽  
Vol 142 ◽  
pp. 47-53
Author(s):  
K Béland ◽  
G Séguin ◽  
S Lair
Keyword(s):  
Mortality Rate ◽  
Striped Bass ◽  
High Mortality ◽  
Morone Saxatilis ◽  
Treatment Results ◽  
Emamectin Benzoate ◽  
Once Daily ◽  
Fish Hatchery ◽  
Parasitic Burden

An unusually high mortality rate due to verminous (Philometra rubra) coelomitis was documented in wild-hatched striped bass Morone saxatilis raised in a fish hatchery as part of a stock restoration program. To decrease the parasitic burden and therefore potentially minimize mortality, the effectiveness of 2 different anthelmintics was evaluated. Two trials were conducted on wild-collected fingerlings naturally infected by P. rubra. In 2006, 144 yearling fish were randomly assigned to 4 experimental groups: (1) levamisole (Levasol®) at 2 mg l-1 via immersion for 8 h once weekly for 3 wk; (2) levamisole at a dose of 2.5 mg kg-1 biomass via feed once daily for 7 d; (3) emamectin benzoate (Slice®) at a dose of 0.05 mg kg-1 biomass via feed once daily for 7 d; and (4) control. Emamectin successfully eliminated live nematodes in 84.9% of the fish, whereas the administration of levamisole, either via immersion or feed, was not successful in significantly reducing the number of live P. rubra. In 2007, the administration of the same dosage of emamectin to approximately 1000 naturally infected yearling striped bass was associated with a 100% mortality rate of P. rubra in the 30 fish randomly examined 5 wk after the beginning of the treatment. Results of these trials indicate that, at the dosage used, the administration of emamectin at the end of the summer is safe for striped bass yearlings and considerably reduces the prevalence and intensity of the infection by this parasite.

FAMILIAL DIABETES AND PERINATAL MORTALITY IN INFANTS OF DIABETIC MOTHERS

1961 ◽  
Vol 37 (3) ◽  
pp. 441-444
Author(s):  
A. Nygaard ◽  
M. Felbo ◽  
J. Pedersen
Keyword(s):  
Perinatal Mortality ◽  
High Mortality ◽  
Term Treatment ◽  
Infants Of Diabetic Mothers ◽  
Long Term Treatment ◽  
Diabetic Mothers

ABSTRACT In a study of 173 pregnancies in 130 diabetic mothers of White's groups B, C and D who had received long-term treatment during pregnancy, the authors found cases of diabetes – in addition to the mother – in the maternal family, in the father and his family, or in the maternal as well as paternal family in a total of 100 pregnancies (57 %). The perinatal mortality was only slightly – and not significantly – higher among infants whose families included other diabetics than the mother. This higher mortality was found only among male infants of whom there was a preponderance in pregnancies with familial diabetes, but this was also not statistically significant. Thus, the result indirectly indicates that the primary cause of the high mortality among the infants of diabetic women must be the fact that the foetus develops in a diabetic environment.

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