Aquatic environments are generally split into three categories; fresh water, marine (salt water) and estuarine (a combination of salt and fresh water). The organisms that live in each of these environments have specific adaptations that allow them to respond to changes in their surrounds. Fish generally prefer either fresh water or salt water and are unable to cope with a change from one to the other. For example the cells in fresh water fish are saltier than the surrounding water, so due to osmosis (the diffusion of water through a semi-permeable membrane) water is constantly flowing into its body. For this reason fresh water fish require very efficient kidneys to remove all of the extra water, and methods of maintaining and collecting the salt lost through urination.
The items you will need now include a filter, a heater and a light housing. Everything involved in aquariums is crucial, but heaters are especially, because fish are very sensitive to temperature changes. My first tank did not have a heater with a high enough wattage and my fish did not survive the lack of heat. The last thing you need to consider is water and how pure the water in your area is. Fish are very sensitive to chlorine and other impurities in tap water.
If I change _____________________________________________ then the fish will __________________________________________________________________________. c. If I change _____________________________________________ then the fish will __________________________________________________________________________. Design your experiment: 4. Your control group is the “group” of fish that you are keeping in their “normal” environment. How many fish will you measure initially?
The buoyancy allows the cuttlefish to hover over the floor of the oceans. The siphuncle is highly modified, running on the ventral side of the shell. Although the cuttlebone is unique to the cuttlefish, it does have a minor set back. Between the depth of 200 and 600 meters the cuttlebone can implode. Because of this factor cuttlefish have adapted to the seafloor in shallow marine waters as their habitat.
First I will talk about their body structures and then about obtaining oxygen and what they eat. Because there is such a variety of forms scientists find it hard to characterize the standard structure body form of crustaceans. Either the exoskeleton is think and protective or delicate and transparent. The basic characteristics of crustaceans are their segmented body and jointed legs. They also have two pairs of antennae attached to their heads.
A study on this topic was done to explore how much of an impact these tiny animals have on the ocean currents as they travel in masses. The thought behind this was the mere through of how many of these organisms are contained in our bodies of water, and how larger singular mammals such as jellyfish can move sizable amounts of water by swimming (Lee, 2014, p.1). The study performed was a test with a small organism called brine shrimp, or the nickname “Sea Monkeys”. “Wind-and tide-driven currents move nutrients, heat, and salt around the ocean, and help to regulate the planet's temperature, Dabiri says. In recent years, scientists have started to seriously consider whether collective animal movements—like plankton swimming up and down en masse—could also be contributing to currents” (Lee, 2014, p.1).
They have a pretty wide toleration for the water that they live in, even though they prefer a cooler more alkaline water in the in the 7.5-8.5 range with temperatures between 65-77 F(Ball). If the water pH strays to far from the preferred range, calcium deficiency could result and affect the molting of crayfish. Crayfish are omnivores, as they eat both meat and plants. They aren’t very picky in their diet. They eat
Lab 1 – Introduction to Science Exercise 1: The Scientific Method Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organisms require oxygen to survive, it is a necessary component of water systems such as streams, lakes, and rivers in order to support aquatic life. The dissolved oxygen is measured in units of parts per million (ppm). Examine the data in Table 4 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from and then answer the questions below. QUESTIONS 1.
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since many living organisms requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measured in units of parts per million (ppm). Examine the data in Table 4 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below. 1.
So you may be asking yourself, how does this apply to the bull shark? The answer is that the bull shark over time has adapted its body to be able to control the amount of salt that its body gets rid of allowing it to live in waters of different salinities. Marine organisms have a high level of salt in their body so that the sea doesn’t dehydrate them because it is a hypertonic solution. Due to the fact that sharks can increase or decrease the content of salt in their blood allows them not to take in too much water when they migrate into freshwaters. Sharks are known to be fierce predators of the sea, and with the capability to venture into freshwater it makes their hunting grounds very vast.