Effect of Larval Trematode Infection on the Nutritional Value of Nerita Orbignyana Marine Snails

2021 ◽  
Vol 11 (2) ◽  
pp. 62-68
Author(s):  
Aisha Omar Turkstani ◽  
Amaal Hassan ◽  
Samar Omar Rabah
Keyword(s):  
Nutritional Value ◽  
Larval Trematode ◽  
Trematode Infection ◽  
Marine Snails

Concentration and retention of Toxoplasma gondii surrogates from seawater by red abalone (Haliotis rufescens)

Parasitology ◽  
2016 ◽  
Vol 143 (13) ◽  
pp. 1703-1712 ◽  
Author(s):  
KRISTEN C. SCHOTT ◽  
COLIN KRUSOR ◽  
M. TIM TINKER ◽  
JAMES MOORE ◽  
PATRICIA A. CONRAD ◽  
...  
Keyword(s):  
Toxoplasma Gondii ◽  
Nutritional Value ◽  
Exposure Concentration ◽  
Sea Otters ◽  
Haliotis Rufescens ◽  
Red Abalone ◽  
Marine Snails ◽  
Zoonotic Parasite ◽  
Paratenic Hosts ◽  
Reduced Risk

SUMMARYSmall marine snails and abalone have been identified as high- and low-risk prey items, respectively, for exposure of threatened southern sea otters to Toxoplasma gondii, a zoonotic parasite that can cause fatal encephalitis in animals and humans. While recent work has characterized snails as paratenic hosts for T. gondii, the ability of abalone to vector the parasite has not been evaluated. To further elucidate why abalone predation may be protective against T. gondii exposure, this study aimed to determine whether: (1) abalone are physiologically capable of acquiring T. gondii; and (2) abalone and snails differ in their ability to concentrate and retain the parasite. Abalone were exposed to T. gondii surrogate microspheres for 24 h, and fecal samples were examined for 2 weeks following exposure. Concentration of surrogates was 2–3 orders of magnitude greater in abalone feces than in the spiked seawater, and excretion of surrogates continued for 14 days post-exposure. These results indicate that, physiologically, abalone and snails can equally vector T. gondii as paratenic hosts. Reduced risk of T. gondii infection in abalone-specializing otters may therefore result from abalone's high nutritional value, which implies otters must consume fewer animals to meet their caloric needs.

scholarly journals Alterations in lipids and minerals in relation to larval trematode infections of Nerita polita marine snails

2021 ◽  
Vol 58 (4) ◽  
pp. 346-355
Author(s):  
A. H. Hassan ◽  
N. S. Alhazmi ◽  
A. AR. Filimban ◽  
M. N. Alsulami
Keyword(s):  
Inductively Coupled Plasma ◽  
Nutritional Value ◽  
Nutritive Value ◽  
Essential Fatty Acids ◽  
Parasitic Infection ◽  
Optical Emission ◽  
Inductively Coupled ◽  
Jeddah City ◽  
Marine Snails ◽  
Trematode Infections

Summary Marine snails provide an important source of vitamins, proteins, minerals, and essential fatty acids, and their mucus has a therapeutic significance. Parasitic infection of larval trematodes in these snails affects their nutritional value. The present study aimed to screen Nerita polita marine snails for the prevalence of cercarial infections and to evaluate the changes in lipids and some minerals in the infected as well as non-infected ones. Snails were collected randomly from February 2018 to January 2019 from the Red Sea Obhor bay, Jeddah city, Saudi Arabia. The amount of triglycerides, cholesterol, and phospholipids in the Digestive Gland Gonad Complex (DGG), hemolymph, and Snail Conditioned Water (SCW) of non-infected and infected Nerita polita snail was estimated using a spectrophotometer. Minerals content such as Ca, Zn, Pb, Na, Mn, Mg, K, Fe, Cu, and Cd, in the DGG and shell in the infected and non-infected snails were analyzed using an Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES). Two types of cercariae were detected, ocellate furcocercus cercaria (Trichobilharzia regent) and xiphidiocercaria (Litorina saxatilis VII). The study showed that there is a fl uctuation in the concentration of lipids and minerals between increase and decrease in DGG, hemolymph, shell, and SCW in infected snails. The nutritive value of the snails is affected with infection through the decrease of some lipids and minerals in infected snails. Further qualitative studies are needed.

Extensive Abnormalities in Larval Trematode Infection

1961 ◽  
Vol 47 (3) ◽  
pp. 445
Author(s):  
Kathleen L. Hussey ◽  
Walter B. Stahl
Keyword(s):  
Larval Trematode ◽  
Trematode Infection
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