The implication of metabolically active Vibrio spp. in the digestive tract of Litopenaeus vannamei for its post-larval development

Putrescine, cadaverine, and indole production capabilities of bacteria isolated from wild domestic and aquacultured Ni-caraguan penaeid shrimp in progressive decomposition states were evaluated. The numbers and types of microorganisms responsible for the production of putrescine, cadaverine, and indole in wild and aquacultured shrimp increased with increasing decomposition temperature and time. Throughout the storage experiments, mean aerobic plate counts (log/g) ranged from 4.5 to 9.7 and 4.5 to 9.0 for domestic and Nicaraguan shrimp, respectively. Vibrio spp. were more prominent in Nicaraguan shrimp (Litopenaeus vannamei) than in domestic shrimp (Litopenaeus setiferus and Litopenaeus brasiliensis). The only amine-producing (putrescine) microorganism isolated from wild and aquacultured shrimp at all temperatures of decomposition (0, 12, 24, and 36°C) was Shewanella putrefaciens. On the basis of putrescine production by S. putrefaciens at 0 and 12°C and putrescine production by S. putrefaciens, Vibrio spp., and Morganella morganii at 24 and 36°C, putrescine should be considered a potential chemical indicator of decomposition in shrimp.

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Peritrophin-like protein from Litopenaeus vannamei (LvPT) involved in white spot syndrome virus (WSSV) infection in digestive tract challenged with reverse gavage

Chinese Journal of Oceanology and Limnology ◽

10.1007/s00343-017-6109-2 ◽

2017 ◽

Vol 35 (6) ◽

pp. 1524-1530 ◽

Cited By ~ 1

Author(s):

Shijun Xie ◽

Fuhua Li ◽

Xiaojun Zhang ◽

Jiquan Zhang ◽

Jianhai Xiang

Keyword(s):

Digestive Tract ◽

Litopenaeus Vannamei ◽

White Spot Syndrome Virus ◽

White Spot ◽

White Spot Syndrome

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Investigation of parasites in the digestive tract of white leg shrimp (Litopenaeus vannamei) cultured at coastal farms in the Mekong Delta

Can Tho University Journal of Science ◽

10.22144/ctu.jen.2021.020 ◽

2021 ◽

Vol 13 (Aquaculture) ◽

pp. 79-85

Author(s):

Thi Hoang Oanh Dang ◽

Thi Nhu Thuy Nguyen ◽

Ngoc Ut Vu

Keyword(s):

Gastrointestinal Tract ◽

Digestive Tract ◽

Litopenaeus Vannamei ◽

Developmental Stages ◽

Slow Growth ◽

Mekong Delta ◽

Pcr Analysis ◽

Histopathological Analysis ◽

Enterocytozoon Hepatopenaei

A total of 291 white leg shrimp samples were collected from 70 cultured ponds in Soc Trang, Bac Lieu and Ca Mau provinces in the Mekong Delta and subjected to endoparasitic detection in the digestive tract. Collected shrimps displayed unhealthy behaviors such as stop or less feeding and lethagic swimming. Pathological signs in the gastrointestinal tract include (1) empty midgut and stomach together with pale and atrophy hepatopancreas; (2) empty, little or discontinued food in the midgut; (3) slow growth and variation in sizes; and (4) white feces. The results from fresh and Giemsa stained smears methods revealed that 96.5% of sampled shrimps were infected by gregarine parasite at different developmental stages. A prevalence infection of 24.7% was recorded with Vermiform present in the hepatopancreas by fresh smear and histology. Histopathological analysis noted that 7.9% of collected shrimp samples had Enterocytozoon hepatopenaei (EHP) spores in hepatopancreas and midgut and confirmed by PCR analysis.

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On the morphology of the genus Flota Hartman, 1967 and corroboration of family status of Flotidae Buzhinskaja, 1996 (Polychaeta)

Zoosystematica Rossica ◽

10.31610/zsr/2006.15.1.7 ◽

2006 ◽

Vol 15 (1) ◽

pp. 7-17

Author(s):

G.N. Buzhinskaja

Keyword(s):

Larval Development ◽

Digestive Tract ◽

Additional Data ◽

Anatomical Structure ◽

External Morphology ◽

Female Gonad ◽

Family Status ◽

Comparative Description

Comparative description of the genus Flota is given, including additional data on the anatomical structure of the digestive tract, female gonad, ventral nervous cord, as well as refining of external morphology. The organization of Flota is compared with that of representatives of other families of polychaetes. The arguments for family status of Flotidae are based on features of structure, differentiating Flota from all other polychaetes (tri-ramous non-grooved palps, enormous ventro-lateral pharyngeal organ of peculiar structure and ventral nervous cord with numerous ganglia on connectives). Apart from being differentiated by these characters Flota differs from Flabelligeridae and close families in the structure of the head, digestive tract, parapodia and pygidium, presence of buccal tentacles and surface arrangement of the ventral nervous cord. Discovery of additional specimens of this genus and other representatives of Flotidae, further study of their anatomy and also investigation of the larval development will allow establishing the place of this family among polychaetes.

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