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C.O.D.

CADMIUM

CALCITE

CALCIUM

CALCIUM OXIDE

CALIBRATION

CALIGUS ELONGATUS

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CANCER

CANNIBALISM

CANNULA

CANNULATION

CANTHAXANTHIN

CAPILLARY

CAPILLARY ACTION

CARBOHYDRATE

CARBON CYCLE

CARBON DIOXIDE (CO<sub>2</sub>)

CARBON FILTER

CARBONATE

CARCINOGENIC

CARCINOMA

CARDIAC MYOPATHY SYNDROME

CARDIAC PUNCTURE

CARNIVOROUS

CAROFUR

CAROTENOIDS

CARRAGEENIN

CARRIER

CARRIER STATE

CARTILAGE

CARTILAGINOUS FISH

CASCADE

CATABOLISM

CATALYST

CATARACT

CATECHOLAMINE

CATHETER

CATHETERIZATION

CAUDAL PEDUNCLE

CAULIFLOWER DISEASE

CAUSATIVE AGENT

CAUSE-SPECIFIC MORTALITY RATE

CELL MEDIATED IMMUNITY

CELLULAR IMMUNE RESPONSE

CENTRIFUGE

CERCARIUM

CEROID

CESTODA

CHANNEL CATFISH VIRUS DISEASE (CCVD)

CHELA

CHELIPED

CHEMICAL FILTRATION

CHEMICAL OXYGEN DEMAND (COD)

CHEMOTHERAPY

CHILODONELLA

CHITIN

CHLAMYS

CHLORAMINES

CHLORAMPHENICOL

CHLORINATION

CHLORINE

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CHRONIC INFECTION

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CLEANER FISHES

CLEAR WATER METHOD

CLEARANCE TIME

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CLINICAL INFECTION

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CODE OF PRACTICE

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COLDWATER VIBRIOSIS

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COPPER (Cu)

CORNEA

CORPUSCLE

CORPUSCLES OF STANNIUS

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COSTIASIS

COTTON WOOL DISEASE

COUNTERSTAIN

CRAB

CRASSOSTREA

CRAYFISH

CRITICAL THERMAL MAXIMUM (CTM)

CROSS INFECTION

CRUSTACEANS

CRYPTOCOTYLE

CTENOPHARYNGODON IDELLA

CULTCH

CUPPED OYSTER (Crassostrea )

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CYANOHAEMOGLOBIN

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CYST

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CYTOPATHOLOGY

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WINKLER METHOD

Definition

A method to determine the oxygen content by titration. In the basic Winkler procedure, a sample of water is treated with manganous sulphate, potassium iodide, and sodium hydroxide. Under highly alkaline conditions, the manganous ion is oxidized by molecular oxygen to manganous dioxide, a brown precipitate. Next, sulphuric acid is added to the sample to dissolve the precipitate and produce acid conditions for the oxidation of iodide to iodine by manganous dioxide. The quantity of I2 released is proportional to the amount of O2 originally present. The amount of I2 is estimated by titration with standard sodium thiosulfate. A starch indicator is used to determine the end point of the titration.

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