IntroductionArtemia franciscana can survive in extreme conditions of salinity, water depth and temperature (Biology 108 laboratory manual, 2010), but A. franciscana prefers- Does it meet these conditions or does it simply cope with their environment? This experiment explored the extent of A's preference. franciscanas towards three major stimuli: light, temperature and acidity. A. franciscana is capable of withstanding extreme temperatures ranging from 6 ̊ C to 40 ̊ C, but as its optimal temperature for reproduction is close to ambient temperature, it can be deduced that A. franciscana will prefer this temperature to other temperatures (Al Dhaheri and Drew, 2003). The same goes for acidity, as Artemia franciscana, which generally thrives in salt lakes, can survive pH levels between 7 and 10, with 8 being ideal for cysts (eggs) to hatch ( Al Dhaheri and Drew, 2003). Based on this fact alone, A. franciscana tested should show a preference for higher pH levels. In the wild, A. franciscana feeds by scraping food, such as algae, rocks and can be classified as a bottom feeder; That said, A. franciscana is generally found in shallow water. Regarding light intensity preference, it can be assumed that A. franciscana reacts to light erratically (Fox, 2001; Al Dhaheri and Drew, 2003). Using these predictions and the results of the experiment on A. franciscana and stimuli, we will be able to determine their preference for light, temperature and pH.Materials and methodsThe procedure was simple since for each stimulus tested a length of a meter, clear, a plastic tube more than a centimeter in diameter and marked in quarters was filled with Artemia franciscana (Biology 108 laboratory manual, 2010). Then, after Biology 10... middle of article... hypothesis that they show a preference only for brighter environments. The two preliminary hypotheses regarding pH and temperature were confirmed because A. franciscana prefers basic habitats and cannot survive in acidic habitats; they also prefer high temperature ranges between 20 and 35 ̊C, which extends from what was initially intended (room temperature). Works cited by Al Dhaheri, S. and C. Drew. 2003. Guide for the management of brine shrimp (Artemia Franciscana) in Al Wathba Wetland Reserve. Terrestrial Environment Research Centre, Abu Dhabi, United Arab Emirates. Laboratory manual Biology 108. 2010. Lab 3, habitat preferences of artemia franciscana, pp. 45-62. University of Alberta, Edmonton, Alberta, Canada. Fox, R. 2001. Invertebrate Anatomy Online: Artemia Franciscana. Lander University. http://webs.lander.edu/rsfox/invertebrates/artemia.html, retrieved February 13, 2011.