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# A fish enthusiast wishes to increase the amount of fish possibly sustained in his fish tank.

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Introduction

Michael Walters 12X Ward Biology Coursework GCSE 2001/2002 Problem A fish enthusiast wishes to increase the amount of fish possibly sustained in his fish tank. However, he cannot afford to upgrade his filtration systems, buy a larger tank, buy more fish, buy a tank heating system or buy more pondweed. Possible factors Having been told that the financial restrictions on this problem are endless, we can only conclude that we must alter the level of oxygen in the water, allowing more fish to breath. To do this, we must increase the photosynthesis levels in the current pondweed. So to find out the possible factors, we must look at what factors would affect the rate of photosynthesis: 1. FOOD LEVELS IN THE PLANT 2. HEAT INTENSITY 3. LIGHT INTENSITY 4. WATER LEVELS We must now eliminate the water, heat and food factors as all three either need to be financed (food levels and heat intensity) or are immeasurable throughout the experiment (water levels). This leaves us with light intensity. Decided Factor Having decided upon light intensity, we must take into consideration any secondary factors created by light. ...read more.

Middle

After that time, I started counting the bubbles released from the weed per minute. When that minute was up, I recorded the number of bubbles released, then immediately moved the lamp 10cm back to the next position for the 2nd reading. After giving the weed its one-minute acclimatization period, I started to count the bubbles again for a one-minute period, as before making sure there was a constant level of outside or interfering light. List of apparatus ? 1 metre ruler ( A ) ? 1 branch of pondweed ( B ) ? 1 beaker of water ( C ) ? 1 boiling tube of water ( D ) ? 1 stand ( E ) ? 1 clamp ( F ) ? 1 spoon of catalyst ( G ) ? 1 table lamp ( H ) ? 1 stop watch ( I ) Diagram of apparatus Table of results Distance of lamp from pond weed (cm) Number of bubbles released from weed (per min) Experiment 1 Experiment 2 Experiment 3 Average 10 39 23 20 27.3 20 31 13 11 18.3 30 27 12 9 16 40 22 10 6 12.6 ...read more.

Conclusion

This would tell us whether there is a point after which light intensity in any environment is irrelevant or not. ? More allocated time would allow for the experiment to be repeated providing indisputably accurate results and figures. ? Perhaps by bunging the test tube we could cut out all 'alien' influence by agents in the air. After deciding that light intensity was to be the independent variable, all other factors must be kept either neutral or constant. In bunging the tube this would be achieved. Other than these above points, the experiment was planned and carried out as accurately as was practically possible, providing us with detailed results to form a conclusion to our problem. Conclusion In conclusion, I can now state that by sticking to the guidelines the only way to increase the capacity for fish in a tank is to increase the light intensity. This is because the higher the light intensity the faster photosynthesis occurs, thus the higher the oxygen levels in the tank. With this in mind, the answer to the fish enthusiast's problem is to move any current lighting closer to the fish tank. ...read more.

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