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In this experiment I will study brine shrimps and test the hatching success of them in different temperatures. These crustaceans are small salt water ones; so small that the adults are only about 8 mm in length

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Introduction

The effect of temperature on the hatching success of brine shrimps In this experiment I will study brine shrimps and test the hatching success of them in different temperatures. These crustaceans are small salt water ones; so small that the adults are only about 8 mm in length. They are relatively easy to keep in the laboratory and will produce dormant egg cysts that hatch to produce young shrimp larvae. Hypothesis It is very hard to come to a prediction about this type of experiment as we do not know enough about them to see what affects the reproductive ability of them. Safety 1. Take care with the glassware make sure that they do not break. 2. The magnifying glasses as they are fragile also. Apparatus � 100 cm3 beakers (one for each temperature to be tested) � 100 cm3 de-chlorinated water for each beaker � 2 g sea salt for each beaker � Stirring rod � Access to refrigerator � Water baths or incubators (one for each temperature to be investigated) ...read more.

Middle

To do this, place a bright light next to the beaker. Any larvae will swim towards the light. Using a fine glass pipette catch the brine shrimps and put them in a small beaker of salt water. Repeat the counting daily for several days. Brine shrimps are very delicate and care must be taken when handling them. Finally, release the young brine shrimps into a salt water aquarium. 12. Record the number of larvae that have successfully hatched at each temperature. Results Try 1 Try 2 Try 3 5�C room 30�C 40�C 5�C room 30�C 40�C 5�C room 30�C 40�C Group1 0 0 0 0 0 0 0 0 0 0 5 3 Group 2 0 0 0 0 0 3 3 0 0 3 12 0 Group 3 0 0 0 0 0 1 1 0 0 0 6 0 Group 4 0 0 0 0 0 1 0 0 0 0 10 0 Group 5 0 0 0 0 0 3 3 0 0 10 7 0 Evaluation When looking at the ...read more.

Conclusion

This may not be the case when we get errors from places and so to get an even better result we should look at the results and take out some of the anomalous results. An example of an anomalous result is that I had got a result that is very different from the others. For example if we got a high number of shrimps that had hatched and then in one of the tries we see that there is not any that had hatched, then this will be anomalous. We could blame this on systematic errors. As I have mentioned before we may only have 100 shrimps. If we exceed this number then we might find that there are errors due to that the space occupied by each shrimp egg is too small. Another error is that we do not know that the room temperature is constant and if we left it over a couple of days we may have found that the temperature at night may not necessarily be the same as it was in the day. ?? ?? ?? ?? Mosharraf Khan ...read more.

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