Lesson 18

Action

Diagnosis

Findings

Methods for investigation

Differential diagnosis

Clinical signs – sea bass

Case study 1

Lesson 17

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

sea bass sea breams cork-screw belly-up fry lesion batch

американский каменный окунь, морской лещ винтовой, спиральный "брюхом кверху" мелкая рыбешка; мальки повреждение, поражение группа

2. Read the words and put down their Russian equivalents:

to be spreading _________________________________

life stages _____________________________________

Internal parasitic infection ________________________

neuronal degeneration ___________________________

3. Put down the adverbs. Translate the words. Continue the list.

Model: easy – easily, легкий - легко

warm - ___________, ______________ - ___________________

abundant - ________, ______________ - ___________________

careful - __________, ______________ - ___________________

4. Master the following words.

rickettsiosis - риккетсиоз

Vibriosis - Вибриоз, вибрионный аборт

myxosporidea - миксоспоридий

Trichodina sp. - Триходиноз.

vacuolation – вакуолизация

retina - сетчатка,

5. Put down the English for:

патологическая гистология

не затронутый болезнью

бактериология

паразитология

вирусология

высокая смертность

6. Translate the following words and word combinations in writing.

the Mediterranean region ____________________

Oral antibiotic therapy ______________________

significant mortalities _______________________

appear belly-up ____________________________

skin lesions _______________________________

7. Read and translate the text.

A sea bass (Dicentrarchus labrax) and sea bream (Sparus auratus) hatchery in the Mediterranean region is experiencing very high mortalities in the sea bass fry and juveniles. Oral antibiotic therapy (oxytetracycline) has been prescribed and a ten day course completed, however, mortalities continue to increase daily and appear to be spreading to other life stages of the bass. Sea bream juveniles in the same hatchery appear unaffected, in good health and with no significant mortalities.

Decreased feeding

Fish near water surface

High mortalities

Some circling behaviour and cork-screw swimming

Some fish appear belly-up near bottom of the tank

No skin lesions

Nodavirus infection

Rickettsiosis

Vibriosis

Internal parasitic infection (myxosporidea)

Histopathology*

Parasitology*

Bacteriology*

Virology*

Parasitology: low level of Trichodina sp. on the skin.

Bacteriology: no significant fish pathogen isolated.

Histopathology: vacuolation and neuronal degeneration in brain, spinal cord

and retina of the eye, otherwise no significant pathology.

Virology: isolation of nodavirus on SSN-1 cell lines.

Nodavirus infection.

No treatment available, however, the farm can manage the disease through the following:

a) Remove affected livestock.

b) Disinfect and clean hatchery and equipment.

c) Institute strict biosecurity measures

d) Restock with fish from certified sources and disinfect eggs.

e) Sterilize incoming seawater.

f) Improve hygiene and sterilization of facility and equipment between batches of fish.

g) Reduce stocking densities.

8. Open the brackets using the correct tense form.

1. Sea bream juveniles in the same hatchery … (to appear) unaffected, in good health and with no significant mortalities.

2. Mortalities … (to continue) to increase daily.

3. The farm … (to sterilize) incoming seawater next month.

4. Some fish … (to appear) belly-up near bottom of the tank before they died.

5. The worker … (to disinfect) and … (to clean) hatchery when the doctor came.

9. Pair work. Prepare illustrations to the text. Give them to your partners to describe. Choose the best.

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