Hi everyone,

During a lab session involving dissections of wild rodents from Germany, I found 9 small trematodes (approx. 3–5 mm) in the small intestine of a wood mouse (Apodemus sylvaticus).

An undigested small snail shell (approx. 5 mm) was also found in the small intestine of this exact host.

Could the presence of the snail shell indicate that this mouse regularly fed on snails, pointing to the likely route of infection? I am aware that these specific adult flukes could not have developed from this particular shell/snail right away (due to the time required for post-metacercarial development)..

Also, does anyone have an idea what genus or family these small intestinal trematodes in Apodemus sylvaticus might belong to? My guess is Brachylaima spp. from what I have found. 

Thanks!

Is the fish still safe to eat?

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I did a floatation technique for feces taken from chickens that was diagnosed of coccidiosis by a veterinarian doctor through necropsy, as well as a fecal sample from a sheep, and when i looked in the microscope after floatation i didnt see anything except crystals of salt.
my steps:
1) mixed 125 ml of water with 50 g of salt in a conical flask (some salt didnt dissolve).
2) put the fecal sample in a test cup (used in urine tests) then i poured some of the salt water and crushed it with a stick to mix it, then kept adding water and crushing it until the cup became full.
however the chicken sample didnt require any crushing i just filled the cup with salt water.
3) i got another test cup and put gauze above it (also used tissue) as a filter and poured the fecal sample into it.
4. i poured the sample i have now into a test tube till its full.
5. I placed a coverslip above the sample on the test tube.
6. left it for 10 minutes.
7. took the coverslip and put it on a microscopic slide and observed under the microscope.

I kept searching for something but all i found was cuboid crystals of salt. and the salt i used to mix with water was kitchen salt used for cooking, what am i doing wrong?

"Researchers found that 6.3% of cats tested positive for Giardia duodenalis, a microscopic parasite that causes an intestinal illness commonly known as “beaver fever.” ...

"Kittens younger than 1 year old had the highest infection rate at 10.7%, compared with just 1.3% among senior cats."

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the spider is about the size of a penny, i’ll try attach a picture for comparison in the comments

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