Types of enzymes used in feed applications Enzymes involved in the digestion of foodstuffs are coming under the classes of hydrolases. Again hydrolases are divided into different types depends on the substrate they works. The feed contains different substrates and so different enzymes function on different substrates, i.e. enzyme works with substrate specificity. The table 1 explains some of the enzymes that have been used in aquafeed for their potential benefit to the aquaculture industry.
Higher HSI indicates higher energy reserve in animals. Viscerosomatic Index (VSI) was used to assess the nutritional and physiological status of the fish. I was able to get the VSI of the gills and unable to get the value of other organs, it is said that high value of VSI for fishes can be linked to their feeding habits and nutritional content of its consumed food. VI. Conclusion & Recommendation Tilapia had a RGL value of 6.666%, as a result of computing its digestive tract's length I therefore conclude that tilapia is an omnivore.
This new approach can reduce the environmental problems associated with waste fish disposal. The experimental fish meal agar used as laboratory media to promote bacterial growth. Due to this approach experimental fish meal agar will replace other different laboratory agar media efficiently & economically. Peptone is partially hydrolyzed protein. Fish meal is clean, cooked, dried tissue of undecomposed fish.
The main exogenous factor affecting proximate composition is diet. Various studies have examined the effects of temperature, light, salinity, pH and oxygen concentration on the proximate composition of fish but these factors would seem to have very limited effects. On the other hand, endogenous factors are genetic and linked to the life stage, age, size, sex and anatomical position in the fish (Huss, 1995). These endogenous factors govern the majority of principles that determines the composition of fish (Huss, 1995). Proximate composition of body muscles of Puntius stigma (male and female) analyzed shows that the moisture content was found to be higher in female, while protein, fat, ash, carbohydrate and minerals contents were higher in male.
On the other hand, the importance of Daphnia in the food chain is significant as Daphnia is preyed upon by several aquatic organisms such as tadpoles, salamanders, aquatic insects, and many of small fish species. Ultimately, and by the end of the chain, food fish for human consumption could be affected as a result of the negative changes in Daphnia
For example, using biomanipulation to improve water quality in nutrient-rich lakes. Biomanipiulation is the alteration of a food web to restore ecosystem health (Shapiro et al. 1975). The basic proposition is that secondary consumers (planktivorous fishes) are removed either through the addition of tertiary consumers (piscivorous fishes) or harvesting, which allows for the dominance of large-bodied, generalist grazers (e.g., Daphnia) to control phytoplankton. When the population of planktivorous fishes increases and there is no predation refuge (e.g., oxygenated hypolimnion) for large-bodied zooplankton, less efficient small-bodied zooplankton grazers (e.g., rotifers and herbivorous copepods) typically dominate zooplankton communities, thus allowing for the overgrowth of phytoplankton.
Accordingly, a number of nonlethal methods were developed to obtain and analyse the gut content of fish. They are based on the stomach contents extraction by mechanical means, or emetic substances (Hyslop 1980; Bowen 1996; Kamler & Pope 2001 and many references there; Elosegi & Sabateri 2009). Nonlethal methods include the
Pond fish culture system is one of the common agricultural techniques in the present. Pond fish culture also a profitable aquaculture practice like as Shrimp of giving foreign exchange. But anyway, it also depends on the culturing fish species (Akankali et al, 2011). According to the Edirisinghe (2009), Ponds are the aquatic water resources which are the sizes below 3ha (In an aspect of Sri Lanka). The water level of ponds also should be near to the ground level.
Deployment of highly powerful fishing technologies, build-up of redundant fishing vessels capacity, pollutions and habitat loss has reduced the fish stocks worldwide. With the help of scientific analyses, policy makers are able to understand the economic reality of fishery activity and fishing industry in order to manage it in a better way. Therefore, efficiency study of the fishery is an important requirement for fishery industry.
Deployment of highly powerful fishing technologies, build-up of redundant fishing vessels capacity, pollutions and habitat loss has reduced the fish stocks worldwide. With the help of scientific analyses, policy makers are able to understand the economic reality of fishery activity and fishing industry in order to manage it in a better way. Therefore, efficiency study of the fishery is an important requirement for fishery industry. Terengganu is one of the