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Selective non digestion of yellow mealworm Tenebrio molitor larvae by arowana
Gomez, Dennis Kaw,Kim, Ji Hyung,Choresca, Casiano Hermopia Jr.,Baeck, Gun Wook,Park, Se Chang The Korean Society of Veterinary Science 2007 大韓獸醫學會誌 Vol.47 No.2
This study reveals the unusual case reported for the first time on the selective non digestion of yellow mealworm (Tenebrio molitor) larvae by arowana fish. In January 2005, an Asian arowana (Scleropages formosus) (red variety), from Daesang Tropical Fish Corporation, Seoul, Korea, mortality was observed due to unknown cause. No putative causal factors were suggested by bacteriological and parasitological examinations. Internal examination of the dissected stomach showed some undigested debris with mandible parts of mealworms attached to the mucosal lining of stomach wall. Feeding experiment of yellow mealworm (Tenebrio molitor) was conducted on the silver arowana (Osteoglossum bicirrhosum). Result showed that on the test group, fish released vomitous material containing undigested mandibles of mealworm was observed on the 24th day of the feeding experiment. Histopathological examination of the cross section of the stomach wall layers of the test groups, showed detached parts of the mucosal layer and gastric pits around the damaged area with intact mucularis tissues. While the control group fed with mealworm larvae without head part showed intact stomach wall layers consisting of gastric pit, mucosa and mucularis tissues. Fish on both treatments survived until the termination of experiment. The removal of mealworm larvae head before feeding probably help or aid in the fast digestion of these insect larvae.
Dennis K. Gomez,Casiano H. Choresca Jr,Ji Hyung Kim,Se Chang Park 한국실험동물학회 2007 Laboratory Animal Research Vol.23 No.1
Sensitivity of diagnostic methods for detection HPV infection at earlier stages of shrimp is very important for the prevention of widespread and losses in shrimp hatcheries. The earliest postlarval stage detected with HPV infection was 3 days old (PL₃ The presence of hypertrophied nucleus in the hepatopancreas tubule epithelial cell diagnostic of HPV intranuclear inclusion body is indicative of HPV infection. Histological method (H&E) was significantly (P < 0.01) sensitive than impression smear in the diagnosis of HPV infection in Penaeus monodon postlarvae (PL₃ to PL₂₉) reared at two stocking densities (25 and 50 PL/liter). This study showed low diagnostic suitability of Giemsa impression smear and advantage of histological method when HPV infection prevalence is low. There was no significant increase in the detection rate of HPV infection in postlarval stages at two rearing densities.
김지형,Dennis K. Gomez,Toshihiro Nakai,박세창 대한수의학회 2010 JOURNAL OF VETERINARY SCIENCE Vol.11 No.1
In order to evaluate the genetic variability of the causative agent of cold water disease (CWD), plasmid profiling was used to characterize Flavobacterium (F.) psychrophilum isolates (n = 169). Size analysis of plasmids in F. psychrophilum isolates (n = 128) from several fish species demonstrated that six kinds of plasmids were harbored, and ayu isolates had different profiles compared to other isolates. Moreover, multiple isolates (n = 41) from CWD outbreaks in 2002 to 2003 at a single ayu farm were examined to determine differences between isolates from successive outbreaks and showed different profiles by the sources of seedlings.
Detection and genetic analysis of aquabirnaviruses in subclinically infected aquarium fish.
Shin, Sang Phil,Gomez, Dennis Kaw,Kim, Ji Hyung,Choresca, Casiano Hermorpia,Han, Jee Eun,Jun, Jin Woo,Park, Se Chang AAVLD 2011 JOURNAL OF VETERINARY DIAGNOSTIC INVESTIGATION Vol.23 No.2
<P>Aquabirnaviruses (ABVs) cause serious diseases in a variety of fish species used worldwide in aquaculture and have been isolated from a variety of healthy fish and shellfish species. The type species of ABV is Infectious pancreatic necrosis virus (IPNV), which is the causative agent of a highly contagious disease in juvenile salmonid fish. Marine birnaviruses (MABVs) have been isolated from various marine fish and shellfish. In Korea, ABV infection has been identified in several fish and shellfish. The current study presents sequence data from nested polymerase chain reaction products of 3 ABV strains obtained from different species of asymptomatic aquarium fish collected from a private commercial aquarium in Korea. Phylogenetic analysis of these strains, based on the partial nucleotide sequence of the VP2/NS junction, placed them within the genogroup VII (95-99% bootstrap confidence), which also contains MABV. The subclinically infected fish may be a source of MABV infection for other susceptible fish species inside the aquarium and potentially represent a serious challenge for the management of MABV infections. Additionally, the presence of MABV in these subclinically infected aquarium fish imported from other countries indicates that there is a need for the establishment of appropriate quarantine practices.</P>
Isolation of Photobacterium damselae subsp. damselae from zebra shark Stegostoma fasciatum
Han, Jee Eun,Gomez, Dennis K.,Kim, Ji Hyung,Choresca, Casiano H. Jr.,Shin, Sang Phil,Baeck, Gun Wook,Park, Se Chang The Korean Society of Veterinary Science 2009 大韓獸醫學會誌 Vol.49 No.1
The zebra shark Stegostoma fasciatum which had been reared in the commercial aquaria was found dead and submitted for postmortem examination. A pure bacterial culture was isolated from pale and enlarged liver. The analysis of ureC and 16S rRNA genes confirmed the isolate as Photobacterium (P.) damselae subsp. damselae and this pathogen was sensitive to gentamicin. Although, no mortality in mouse was observed in the experimental infection study, the isolation of this pathogen in aquarium fish is significant because it can act as a reservoir to other aquatic animals and can also be zoonotic potential to human during aquarium management. This paper describes the first isolation of P. damselae subsp. damselae from zebra shark.
HAN, Jee Eun,GOMEZ, Dennis K.,KIM, Ji Hyung,CHORESCA JR., Casiano H.,SHIN, Sang Phil,PARK, Se Chang Japanese Society of Veterinary Science 2010 The Journal of veterinary medical science Vol.72 No.1
<P>The Egyptian fruit-bat <I>Rousettus aegyptiacus</I> which had been raised at the private commercial aquarium in Seoul, Korea for indoor exhibition was found dead and submitted to College of Veterinary Medicine, Seoul National University for postmortem examination. A pure bacterium of <I>Kluyvera ascorbata</I> was isolated from the blood specimen. The isolation of <I>K. ascorbata</I> from fruit bat is very important, because it is the most infectious agent of the genus Kluyvera that cause serious diseases to animals and human. Fruit-bats which are distributed in pet shops through black-market in Korea although unproven become popular pet nowadays. This situation enhances chance of zoonosis. This paper describes the first isolation of <I>K. ascorbata</I> from the Egyptian fruit-bat.</P>
Choresca, Casiano H. Jr.,Gomez, Dennis K.,Han, Jee-Eun,Shin, Sang-Phil,Kim, Ji-Hyung,Jun, Jin-Woo,Park, Se-Chang The Korean Society of Veterinary Science 2010 大韓獸醫學會誌 Vol.50 No.4
Moribund albino catfish, Clarias sp., displayed from an indoor private commercial aquarium were submitted in the laboratory for diagnostic examination. Dense culture of bacteria was recovered from the kidney and was characterized using Vitek System 2 and showed 98% probability to Aeromonas (A.) hydrophila. PCR result showed positive using A. hydrophila extracellular hemolysin gene ahh1 (130 bp) and aerolysin gene aerA (309 bp). The 16S rRNA gene was identical and exhibited 97% sequence similarity with the other known isolates of A. hydrophila available in the GenBank. In this paper, we reported the isolation and molecular detection of A. hydrophila from an albino catfish.
Occurrence of Goiter in Flowerhorn Cichlid (Family : Cichlidae) and Its Effect on Liver
신상필,지향,김지형,Dennis K. Gomez,Casiano H. Choresca Jr,한지은,김대용,박세창 한국임상수의학회 2010 한국임상수의학회지 Vol.27 No.2
A flowerhorn fish with a subopercular mass, which had been reared in one of the private commercial aquaria was sent to the laboratory just before death. This fish began to show symptoms such as lethargy, anorexia, depression and dyspnea, and eventually died. The mass and intestinal organs were examined histopathologically. Thyroid showed variably sized follicles that contained abundant colloid and liver revealed steatosis. This report presents a case of goiter in the flowerhorn cichlid and its effect on the liver.