Wednesday, November 16, 2011

Cold Fish and Water Quality @PSN

The session started with Fish Anatomy.

Live fish was handed out to the kids

Ean taking the temperature of the water and Han examining his brother

Emil counting the number of times the operculum of the fish opened and closed in a minute.
We counted 126x. The fish was hyperventilating, probably due to Ean swirling his thermometer in the water and scaring the fish.

Ean at work

We were given ice cubes to lower the temperature of the water. The respiration rate of the fish was reduced by half.
As more ice cubes were dropped into the water, the fish's respiration rate lowered further until...

By the end of the experiment, most of the fish in the lab was barely moving. Some went belly up.

Concerned kids and parents looking on as the fish was placed into a warmer environment. The fish was not poured into the tank but lowered in its beaker to allow it to acclimatise to the warmer water. The lab demonstartor warned against sudden temperature changes in fish

All the fish revived after a few minutes.
The kids were too fascinated at the condition of the fish to ask why the fish stopped breathing in icy cold water and eventually recovered in warmer waters.

Fai's worksheet

Next experiment was to compare test results of pond and tap water using a test kit

Pour in either pond or tap water. Squirt in a few drops of the indicator solution according to the instructions given and compare the colour of the solution obtained to the reference colour card to determine the pH.
Same procedure for testing of nitrite and ammonia.

Lesson learnt:

Animal testing is heart wrenching


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