Fish Biology And Fast Growth Rates

Limpets (Patella vulgate) live in algae rich environments on rocky shores. . It has been proposed that in more sheltered areas, limpet shells will grow to be flatter with a larger diameter, while in more exposed areas of coastline, they will grow a taller and narrower shell shape. To find out whether or not the shores of Aberdeen reflected this, samples were taken from two sites (Site A and Site B) along the Aberdeen coastline that varied in their exposure to wave action. The sites were chosen to provide two sample sites with a notable difference in their environment. In the more sheltered site A, limpets were not exposed to harsh waves, while at site B, there was significantly more wave action. Quadrats were used at both sites to provide an area of sampling for the limpets and they were placed around 5 meters from the waterline. The overall results from the study showed that there is a very strong relationship between diameter and height in Limpet shells and that there was an incredibly slight difference in the relationship between the two sites.

In the Gulf of Mexico a variety of marine environments can be utilized by fish. Common environments include Coral reefs and Sargassum. An assortment of fish can inhabit these environments but which environment they live in depends on their life history. Histrio histrio (Sargassum Fish) live in the Sargassum and Caranx Crysos (Blue Runner) live in the open water near reefs. Natural mortality of these species can be linked to their distribution and their life history strategies.

The test subjects, O. rusticus crayfish, were collected from the White River.. Body length and body weight were measured with the use of a measuring tape and a gram scale. The rate of oxygen consumption was studied by the use of intermittent closed respirometry with a Q-box AQUA device. This was conducted by measuring the amount of dissolved oxygen present in the water chamber without removing the organism from the container so as to demonstrate the amount of oxygen consumed by the crayfish over a given set of time. By periodically measuring the amount of oxygen present in the water at an interval of twice per second, the rate of oxygen consumption can be

The population dynamics of Daphnia magna are observed under three different conditions; low, medium, and high density. The effects of different population densities on the survivorship and reproduction of Daphnia are observed over a two-week period within a lab environment. Over the two week period, the numbers of parent Daphnia alive and dead are recorded daily, along with the amount of offspring produced each day. From the main parameter investigated, the net reproductive rate, the results of the experiment support that higher densities result in less successful reproduction and decreased fecundity. Values for the instantaneous growth rate of the populations also suggests that low and medium density populations allow for

The purpose of this study was to see whether or not seasons would affect the abundance and size of flatfish species. The hypothesis presented throughout the experiment was that seasonal effect would be present in the flatfishes that were being tested. This hypothesis was made because of the fact that there is a difference in spawning around the year within flatfish species.

However, La Gloria had the most negative inbreeding coefficient, and La Esperanza and Baños had less negative, more similar inbreeding coefficients. The results of analyzing population structure included 7.17% of the variance in the data set and 3.26% of the variance separating each population into different clusters. A maximum-likelihood bifurcating tree showed that Baños and La Gloria were most closely related. The results analyzing the population demographics included that the two P. sulphuraria populations were more closely related. It was also found from the demographic models that migration occurred from the Baños and La Gloria ancestral populations, and that there are recent migrants from the La Gloria to the Baños population and from the La Esperanza to the La Gloria population. The researchers concluded that the Poecilia populations, which have geographically limited habitats, show high levels of genetic diversity and no indications of inbreeding. This conclusion contradicts findings from other studies. An explanation for the differences between the sexes is sexual dimorphism being common in Poecilia. It was also concluded that the populations are morphologically distinct, and it is not known why misclassifications occurred between the Baños and La Esperanza populations. The populations were also genetically distinct, despite migration, and the assumption was made that the common ancestor was also a

The ocean contains traces of thousands of marine species of different shapes and sizes, from the

Due to the thin soluble shells of Pteropods, they have been used to foretell the possible effects of ocean acidification (Orr, et. al. 1).

Marine ecosystems are shaped by the abiotic factors that make up the environment. Water temperature, amount of dissolved oxygen, and pH determines the biota that may live in it (Walther, 2002). In recent years, empirical evidence has shown that the average global air and sea surface temperatures are increasing in most places around the world. As local climate changes, the organisms in the ecosystems change and adapt. This can alter the physiological functioning, behavior, spatial range, and abundance of populations (Walther, 2002). Some of the greatest indicators of these changes are gelatinous zooplankton, such as jellyfish and ctenophores. With their quick generational time they quickly show how a changing environment can affect an organism. When conditions are right, jellyfish populations can undergo a rapid increase in abundance in an event called a “jellyfish bloom”. While these are usually indicators of a healthy pelagic ecosystem, they have been increasing in frequency over the last century. These blooms can have large negative impacts on fisheries, coastal communities, and on pelagic ecosystems.

It is unusual that more than 50% of a living community consists of organisms with bio-mineralised skeletons (Brenchley & Harper, 1998), with soft bodied organisms such as algae, and many others at the base of the food chain lacking sufficient preservation potential, therefore skewing reconstructed trophic models with their absence. Amongst those fauna that have been preserved, many processes during subsequent geological events can affect the final assemblage – the most important of which being chemical dissolution (Brenchley & Harper, 1998). When considering small shelly fauna in marine environments, in most cases it is likely that preservation will favour older, more developed organisms, as these will often be of sufficient size and have grown the appropriate body parts to be preserved. Nevertheless, the sizes that are preserved can sometimes be indicative of the environmental conditions during the organisms’ lifetimes –the range of sizes in the environment can be used to determine whether there were any limiting controls on growth when comparing to datasets from control environments. When the situation arises that the environment in which communities are living changes, this can also affect the fossil record. Most likely to occur in nearshore marine environments, this involves the replacement of

Climate plays an important environmental influence on our ecosystems, and climate changes and the influences of it affect ecosystems in many ways. Ecosystems are already showing negative impacts under current levels of climate change. One of the biggest issues that we are facing nowadays is global warming. With the global warming and the rising of the temperature of sea water, it has great impact on the species in the ocean. More species is facing extinction and with the rising of temperature, it could force species in the ocean to migrate to higher latitudes where temperatures are lower and easier to survive. In this research, I would like to know if global warming would force fish migrate to north or not. I will test the sea water temperature and the survivability of zooplankton with different water temperature. By doing this research, it enables us to understand the habit of species in the ocean and to avoid the extinction of certain species. This research will also prove that global warming influences the whole ocean ecosystem and we should recognize this issue and think what we can do to reduce and slow down the damage to the ocean.

In this study, taxonomic importance of trichomes morphology and density were investigated in ……….Nepeta species. On the bases of previous investigations (e.g. Gairola et al., 2009; Metcalfe and Chalk, 1950) the traits of indumentum are very useful in taxonomical treatment of Labiatae at various levels, either infrageneric (Navarro and El Oualidi, 2000), or infraspecific (Giuliani et al., 2008).

A total of seven marine sediment samples were collected from the Red Sea, Egypt (Ras Gharib, Marina, El Tor, Nwebaa, Dahab, Ras Sedr and Naama Bay) and seven shrimp specimens were collected from the Red Sea, Egypt.

A. Stephen Dept. of Ecology, French Institute of Pondicherry, Puducherry-605001, India stephanos.crown@gmail.com; +91 9841890069 ____________________________________________________________________________________________

3 PG Research Scholar, Department of Fisheries Biology and Resource Management, Fisheries College and Research Institute; Tamil Nadu Fisheries University; Thoothukudi; Tamil Nadu; India – 628008