The Growth of Microalgae in Shrimp Hatchery: Impact of Environment on Nutritional Values

IOSR Journal of Biotechnology and Biochemistry (IOSR-JBB)
ISSN: 2455-264X, Volume 1, Issue 6 (Sep. – Oct. 2015), PP 89-96
www.iosrjournals.org
www.iosrjournals.org 89 | Page
The Growth of Microalgae in Shrimp Hatchery: Impact of
Environment on Nutritional Values
1
G. RAJ KUMAR, (PhD) 2
Prof. D.E. BABU
1
Biotechnology Dept HOD, Aditya Degree College, Kakinada, (A.P), India.
2
Department of Zoology, Andhra University, Visakhapatnam, (A.P), India.
Abstract: India is the second-largest aquaculture producer in the world. Like the largest producer, China,
India's Aquaculture is dominated by carp production: about 80% of India's aquaculture production is composed
of carps of Indian and Chinese origin. In the last 20 years, carp production has intensified in several parts of
India. The challenges ahead include feed cost management which needs to be achieved through optimization of
feed ingredients, and increasing farm gate price of fish though efficient post-harvest preservation and marketing
techniques. Also species diversification to include higher value fish in farming will pave way for widespread
feed-based farming and bring better returns to the farmer. The aim of present research study is to describe the
various techniques employed for the production and application of live food organisms as well as their applications
in shrimp hatcheries. The natural diet of most cultured species consists of phytoplankton and zooplankton found
abundant in natural plankton. For culturing of fish and shrimp, readily and consistently available, practical and
performing live diets need to be selected. From the practical viewpoint of the culturists a good diet should be readily
available, cost-effective as well as versatile in application. Analysis of the economics of large-scale culture indicates
that the total cost of the algae produced will be approximately proportional to the growth area. By using methods
mentioned the Culture of Algae are taken, their essential Amino acids are separated and identified. During
culture of microalgae environmental parameters like light, Temperature and media effect on nutritional values.
Keywords: production, Amino acids, environmental parameters.s
I. Introduction
Throughout the centuries fish has been an important component of the population’s diet in many parts
of the world. Fish catches increased rapidly over the past hundred years due to improved technology, which
provided more powerful engines and sonar equipment. This led to over fishing and caused a worldwide decrease
in wild stocks. As a result, the growth in fish catches stopped some 20 years ago. The need to increase fish
production by farming became therefore an urgent matter. The term ‘aquaculture’ covers all forms of cultivation
of aquatic animals and plants in fresh-, brackish- and saltwater. Aquaculture has the same objective as
agriculture, namely, to increase the production of food above the level that would be produced naturally. Today,
aquaculture is responsible for an ever-increasing share of global aquatic food production, which has increased
from 3.9 percent in 1970 to 41.9 percent in 2014. Land, water and climatic conditions are probably the most
important natural factors that need to be assessed. When developing a site for fish farming you should consider
the effect it may have on the environment. Important natural areas (e.g. fish nursery grounds like mangrove
forests) should not be used for fish farming. One of the most essential requirements is water availability, in
terms of quality and quantity. The type of aquaculture farm and species of animals or plants that you will be able
to culture will depend largely on the properties of the site. The risks involved in fish farming should also be
stressed. Fish need protein in order to grow and reproduce. This means they can become competitors for
products, which could otherwise be used directly for human consumption. Furthermore, the cost of production is
fairly high and therefore fish grown in ponds are not always able to compete financially with fish caught in the
wild. Setting up a fish farm involves high initial investment and high production costs as well as economic risks.
Therefore, there are some very important factors a prospective fish farmer should consider before embarking on
a fish farming venture. India rank 17th
position in world seafood exports. Marine products contribute 1.30% of
India’s total exports. India is the 8th
largest shrimp producer and ranks 2nd
largest in aquaculture production in
global scenario. The pollution free waters along the 8129 km long Indian coastline, 1.2 million hectors of
brackish water area and 5.4 million hectares of fresh water area. India’s growing environmental consciousness
has been increase awareness in practice of water aquaculture. In India aquaculture constitutes freshwater and
brackish water aquaculture; aquaculture is practiced in 9 maritime states of India. Species wise aquaculture
production through India (FAO 2008) and brackish water (MPEDA statistics 2009-10) aquaculture. p. monodon,
p.indicus and L.vannamei are the two species cultured in brackish water, this forms the bulk of export to EU and
other countries. It may be seen from the data that Indian major carps namely catla, rohu, and mrigal are the
main species which contribute major shore of aquaculture production in the country and the main crustacean
species culture in freshwater is macrobrachium rosenbergii (fresh water prawn) India has the potential to

The Growth of Microalgae in Shrimp Hatchery: Impact of Environment on Nutritional Values
achieve 5,00,000 tonnes of aqua-production, by 2015. Various agencies and the industry must work hand-in-
hand, to bring 50,000 hectares of new area per year, into production. The need of the hour is to increase the
infrastructure, such as ice plants, insulated vehicles and processing capacity. Right now, the major constraints
are the lack of inputs such as SPF seeds, power, finance from banks, and the absence of insurance. All these can
be solved if aquaculture is granted agricultural status, and by supplying the farmers with 100% SPF seeds,
whether Vannamei or Monodon.
II. Fish Nutrition, Health And Reproduction
Fish Nutrition
There are usually two types of food available to the fish: natural and supplementary. Natural fish food
consists of phytoplankton, zooplankton, periphyton, water plants, etc. produced in the pond itself.
Supplementary fish feed is produced outside the pond and supplied to the fish regularly to further increase the
amount of nutrients in the pond.
Natural fish food
The natural fish food in the pond largely consists of phytoplankton. The amount of phytoplankton can
be increased by the addition of fertilizer to the pond.
III. Materials And Methods
Micro-Algal culture:
The isolation of required species, identification, preparation of culture media, stock culture maintenance, mass
culture, harvest and preservation of the culture.
ISOLATION: Isolation of the micro-algae can be done by any one of the following methods.
A. By exploiting the Phototactic Movements
B. By agar plating method
C. Serial Dilution Culture Technique
This method is widely used in hatcheries mainly for the isolation of phyto flagellates. In this method, 5
dilution steps (the inocula corresponding to 1, 10!
10'2
, 103
and 10-4
or 4 steps – [ 0. 001, 0.01, 0.1 and 1 ml] are
involved for the isolation of the required species. For the serial dilution technique, nearly 40 culture tubes (15 ml) are
required. After filtering the seawater through 10 micron seive, the filtrate has to be inoculated in five series of culture
tubes in various concentrations. This has to be kept under sufficient light (1 k lux) with uniform temperature (25°C)
conditions. After 15 days, some discolouration can be seen in the culture tubes, due to the growth of micro-algae.
Further purification of this culture can be done by sub-culturing it in 50 ml conical flasks and then in 500 ml and one
litre conical flasks. Once the culture was full, it was transferred into a 3 or 4 litre culture flask and maintained as
stock culture. After the isolation of the required species in culture tubes, it may be sub-cultured again in few 50 ml
test tubes.
Stock Culture Maintenance: Stock culture of all the micro-algae was maintained in a special air conditioning
room adjacent to the mass culture room. Guillard medium enriched with vitamins is the ideal one suitable to
maintain the stock of all the diatoms. The time required for the maximum cell concentration varied depending on the
species. However, it was noticed that all the diatoms required 2 days for the completion of growth phases before
entering into the stationary phase. In the stationary phase, the micro-algae was kept for a period of 1 month in the
stock culture room, under controlled conditions of light and temperature, with or without aeration. When the colour
of the culture turned into brown, then the culture enters into the stationary phase.
Mass Culture of Micro-algae: Large-scale culture of micro-algae, are necessary for feeding the rearing larval
forms in a hatchery. The containers used for the mass culture of micro-algae are 20 litre capacity carbuoys,100 litre
trash cans , 25O litre or 1 tonne fibre-glass tanks, Fully grown culture from the stock culture room is used as
inoculum for the mass culture in these containers. About 100 ml of the inoculum is used for the 2 lt conical flasks,
250 ml for the glass carbuoys and 2 litres for the 100 litre trash cans which are properly lighted and aerated. Cells in
the growing phase on the 9-10th day were harvested. After estimating the cell concentration and ensuring the
quality and using a haemocyotometer, the culture is supplied to the hatchery for the rearing operations of the larval
organisms,
IV. Algal Production:
Physical and Chemical conditions: The most important parameters regulating algal growth are nutrient quantity
and quality light, pH, salinity and temperature and aeration.
Culture Medium/Nutrients: Algal cultures must therefore be enriched with nutrients to make up for the
deficiencies in the seawater. Macronutrients include nitrate, phosphate and silicate.

Table 1 Environmental condition for culturing micro –algae.
Parameter Range Optima
Temperature (0 C) 20-35 24-26
Salinity (g.1-1) 12-40 20-24
Light intensity (lux) 500-4000 2000-3000
PH 7-9 8.2-8.7
Silicate is specifically used for the growth of diatoms which utilize this compound for the production of
their external shell. Micronutrients consist of various trace metals and the vitamins like thiamin (B1),
cyanocobalamin (B12) and sometimes biotin. Two enrichment media that have been used extensively and which are
suitable for the growth of most algae are the Walne medium and the Guillard’s (F/2) medium.
Light: As with all plants, micro-algae photosynthesize, i.e. they assimilate inorganic carbon for conversion into
organic matter. Light is the source of energy which drives this reaction and in this regard intensity, spectral quality
and photoperiod need to be considered. Light may be natural or supplied by fluorescent tubes. Too high light
intensity may result in photo-inhibition. Moreover, overheating due to both natural and artificial illumination should
be avoided.. The duration of artificial illumination should be a minimum of 18 h of light per day.
pH : The pH range for most cultured algal species is between 7 and 9, with the optimum range being 8.2-8.7. pH is
accomplished by aerating the culture. In the case of high-density algal culture, the addition of carbon dioxide allows
to correct for increased pH, which may reach limiting values of up to pH 9 during algal growth.
Maintenance of Cultures: Several laboratory techniques are available for isolating individual cells, such as serial
dilution culture, successive plating on agar media, and separation using capillary pipettes. Bacteria can be eliminated
from the phytoplankton culture by washing or plating in the presence of antibiotics. Stock cultures are kept in test
tubes at a light intensity of about 1000 lux and a temperature of 16°C to 19°C. Constant illumination is suitable for
the maintenance of diatoms,
Water Treatment: Seawater used for algal culture should be free of microorganisms. Sterilization of the seawater
is done either by physical (filtration, autoclaving, pasteurization, UV irradiation) or chemical methods (chlorination,
acidification, ozonization) is therefore required. Autoclaving (15 to 45 min. at 120°C and 20 psi, depending on the
volume) is mostly applied for sterilizing the culture medium in test tubes, volumetric flasks, and carboys. Volumes
greater than 20 l are generally filtered at 1 m and treated with acid (e.g. hydrochloric acid at pH 3, neutralization
after 24 h with sodium carbonate).
Algal Culture Techniques : Algae can be produced using a wide variety of methods
 Indoor/Outdoor. Indoor culture allows control over illumination, temperature, nutrient level, contamination with
microorganisms and competing algae, whereas outdoor algal systems make it very difficult to grow specific
algal cultures for extended periods.
 Open/Closed. Open cultures such as uncovered ponds and tanks (indoors or outdoors) are more readily
contaminated than closed culture vessels such as tubes, flasks, carboys, bags, etc.
Quantifying Algal Biomass: There are several ways to evaluate the quantity of algal biomass present in cultures
either by counting the number of cells or through determination of volume, optical density or weight. Cells can be
counted either with an electronic particle counter or directly under a microscope, using a haemocytometer. Algal
cells growth rate is counted after adjusting the environmental parameters like temperature, light. This counting
is done by haemocytometer. It is usually performed in slide chamber which has a film depth of 0.2 mm between
the counting surface of the slide and the over lying cover slip. The counting surfaces is marked with triple lines
into nine large squares, each 1 mm3
in area and subdivided into 16 small squares. The volume of the culture in
Table 2. Composition and preparation of guillards f/2 medium (modified from smith et al ., 1931.
Nutrients Quantities in seawater/ 1litre
NaNo3 75 g
NaH2PO4.2H2O 5 g
Sodium metasilicate (Na2 SiO3.5H2O) 30 g
Na2EDTA 4.36 g
COBALTOUS CHLORIDE (CoCl2.6H2O) 0.01g
CuSO4.5H2O 0.01g
Ferric chloride 3.15g
Mncl2.5H2O 0.18 g
Na2moO4.2H2O 0.006g
ZnSO4.7H2O 0.022g
Thiamine HCl 0.1 g
Biotin 0.0005 g
B12 0.0005 g

the film over lying fine large squares in thus 1mm3
and the count of the cells on fine large squares in this the
count per mm3
.
Media is also altered in the cultures and their cell count is also done. The media widely used in F/2
media. When F/1 & F/4 media is used change in cell count has be observed in haemocytometer. A relationship
between optical density and cellular concentration can be established using a spectrophoto meter. The density of
harvested algal cultures generally ranges between 80 and 250 mg of dry weight per liter.
V. Results
Yield per Unit Area: Analysis of the economics of large-scale culture indicates that the total cost of the algae
produced will be approximately proportional to the growth area.
Table 1. Cellular dry weight reported in literature for algal species commonly used in Mariculture
Algal species Dry weight (pg cell-1
)
Skeletonema costatum 52.2
Chaetocerols Gracilis 30.6
Effect of Environmental parameters on Algae:
By using methods mentioned the Culture of Algea and Artemia are taken, their essential Aminoacids
are separated and identified. The Aminoacids which were identified are: 1) Iysine, 2) Histidine, 3) Arginine, 4)
Threonine, 5) Valine, 6) Methionine, 7) Isoleucine, 8) Leucine, 9) Tyrosine, 10) Phenylalanine.
During culture of microalgae environmental parameters like light, temperature and media was altered for
every 2 days. After observation against temperature changes from 20o
C to 35o
C maximum growth was at 25o
C i.e.,
5.9 millions/ml . The cell growth is minimum at 20o
C and 35o
C. The results were shown in table 2 and graph. In the
similar way light is adjusted from 500 to 5000lux maximum cell count is observed at 2000 lux which is 5.2
millions/ml. Table 2 and graph shows detailed analysis of cell count. At optimum conditions if the media
composition changed from F/1 to F/4, cell count is increased from 4.1 and decreased to 3.8 million shown in table 4
and graph.
TABLE-2 EFFECT OF TEMPERATURE ON ALGAL GROWTH
s.no
Temp-
erature
in o
c
Growth
In
millions/
ml s.no
Temp-
erature
in o
c Growth in
millions/ml
1 20 2.3 9 28 4.1
2 21 2.7 10 29 3.9
3 22 3.9 11 30 3.7
4 23 4.7 12 31 3.3
5 24 5.9 13 32 3.1
6 25 5.1 14 33 2.7
7 26 4.9 15 34 2.3
8 27 4.5 16 35 2.1
After counting the number of algal cells by haemocytometer at different temperatures, a graph is
plotted against temperature (x axis) and growth (y axis). Highest count was found at temperature 24o
C .Cell
count slighty decreases after optimum temperature. After optimum temperature 30o
C there is a rapid decrease of
cell count which indicates that temperature has a major impact on the growth of algal cells.
0
2
4
6
8
10
18192021222324252627282930313233343536
GrowthinMillions/ml
Temperature in oc
Effect of Temperature on
algal growth.

TABLE 3. THE EFFECT OF LIGHT ON ALGAL GROWTH
S.l.No
Intensity
(lux)
Growth in
millions/cell
1 500 1.8
2 1000 2.7
3 1500 3.6
4 2000 5.2
5 2500 4.7
6 3000 3.8
7 3500 2.9
8 4000 2.6
9 4500 2.2
10 5000 2.1
A standarad graph is plotted by taking intensity of x- axis and growth of cells of algae on y-axis. This
results in the formation of peak which indicates that maximum growth has been observed upto 5.2 millions at
optimum light intensity which is 2000 lux. Minimum growth is observed at 500 lux and 5000 lux.
TABLE .4 EFFECT OF NUTRIENTS ON ALGAL GROWTH
S.l.No Media(F)
Growth in
Millions/ml
1 1 4.1
2 2 5.2
3 4 3.8
When the algae were cultured in three different F media, change in cell count has been observed.
Maximum growth is observed when cultured in F/2 i.e., 5.2 million /ml. A graph is plotted against media and
growth indicates that growth is maximum in F/2 media than F/1 media. As F/1 is having high concentration of
nutrients, it decreases the growth of microalgae.
NUTRITIONAL VALUE OF MICRO-ALGAE
Effect of Temperature on Nutritional content of Algae: The nutritional value of any algal species depends on
its cell size, digestibility, production of toxic compounds, and biochemical composition. Protein is always the
major organic constituent, followed usually by lipid and then by carbohydrate. After estimating level of protein,
lipid, and carbohydrate it is found that proteins are 32%, lipids- 7.1%, and carbohydrate 6.2%, respectively at
optimum temperature. This percentage of nutrition value is shown in table and graph. These changes were
observed at different temperature ranges from 20 to 39o
C. Like temp, when light is changed from 500 to 4000 lux
nutrition content was estimated to be more at 2000 lux and minimum at 500 and 4000 lux i.e., protein 2.1%, lipid
7.2% and carbohydrate 7.5% ,this can be shown in table and graph. In the same way media was also changed from
F/1 to F/4, it is observed that protein is 34%, lipid 7% carbohydrate 6.2% in F/2 media at optimum conditions. All
the above estimations were done by spectrophotometer described in methods. No abrupt changes of protein were
noticed in temperature 24°c, but a significant fall in protein was observed at 20o
C and 39°c. Carbohydrate and lipid
breakdown was more significant at low and high temperaturez
0
1
2
3
4
5
6
0 1000 2000 3000 4000 5000 6000
GrowthinMillion/ml
Intensity
Effect of light on algal growth
0
1
2
3
4
5
6
0 1 2 3 4 5
Growthinmillions/ml
Media
Effect of nutrients on algal growth

TABLE 5. EFFECT OF NUTRUTION CONTENT OF ALGAE.
S.l.No Temperature
in °c
% of
Protein
% of
Lipid
% of
Carb0
hydrate
1 20 31.10 5.80 5.00
2 21 31.20 6.00 5.40
3 22 31.50 6.20 6.00
4 23 31.80 6.70 6.10
5 24 32.10 7.10 6.20
6 25 32.00 6.10 6.00
7 26 31.90 6.00 6.00
8 27 31.80 5.90 5.50
Today live diet which is widely applied in industrial larviculture of fish and shellfish are : Microalgae ( chaetoceros,
skeletonema etc.)
MICROALGAE
Phytoplankton comprises the base of the food chain in the marine environment. It is an indispensable food
source in the commercial rearing of many cultivated species. Algae are further more used to produce mass quantities
of zooplankton, which in turn serve as food for the larvae and adult. Algae is used directly with in larval rearing
tanks, where they are believed to play a role in stabilizing the water quality, nutrition of the larvae, and microbial
control. All algal species may not equally support the growth and survival of a particular filter-feeding animal.
Suitable algal species have been selected on the basis of their mass culture potential, cell size, digestibility, and
overall food value for the feeding animal. Various techniques have been developed to culture these food species on
large scale. However, the controlled production of micro algae is a complex and expensive procedure. In order to
reduce and overcome problems and limitations associated with algal cultures, various investigators have attempted
to replace algae using artificial diets either as a supplement or as the main food.
Major Classes and Genera of Cultured Algal species : Today, more than 40 different species of micro-algae,
isolated in different parts of the world, are cultured as pure strains in intensive systems. These Include species of
diatoms, flagellated and chlorococcalean green algae, and filamentous blue-green algae, ranging in size from a few
micrometres to more than 100 m.. The most frequently used species in commercial mariculture operations are the
diatoms, Skeletonema costatum, Thalassiosira pseudonana, Chaetoceros gracilis, C.calcitrans, the flagellates
Isochrysis galbana, Tetraselmis suecica, Monochrysis lutheri, and the chlorococcalean Chlorella.
The floating microscopic plants or the phytoplankton are the micro-algae which form the basic food of
almost all the animals in aquatic ecosystem. Most phytoplankton organisms are unicellular and are the primary
producers of organic matter in aquatic habitats. The scope of micro-algae as a possible source of protein food was
recognised by the researches in the middle of the 20th century (Gopinathan, 2000 ). The success of a hatchery
operation depends mainly on providing the required species of micro-algae. The larvae of prawns and fish prefer the
diatoms as the basic food. Hence the culture of micro-algae is an essential pre-requisite for the rearing operations of
shellfishes and finfishes in a hatchery system.

TABLE 6. EFFECT OF LIGHT ON NUTRITIONAL CONTENT OF ALGAE
S.l.No light(lux)
% of
Protein
% of
Lipid
% Carbo
hydrate
1 500 31.7 6.6 6.5
2 1000 31.8 6.9 7.3
3 1500 32 7.1 7.1
4 2000 32.1 7.2 7.5
5 2500 32 7 7.3
6 3000 31.9 6.7 7.1
7 3500 31.8 6.6 6.8
8 4000 31.6 6.8 6.5
Different intensities of light ie., 500 lux to 4000 lux was applied to algal culture. Then the % of
nutritional content is estimated by spectrophotometer. Then the data obtained a graph is plotted against light
intensity (x axis) and % of nutrition ( y axis) the graph indicates that slight variation has been observed than
temperature maximum percentage has been found at 2000 lux with 32.1% of proteins, 7.2% of lipids and 7.5%
of carbohydrates. The utility of proteins, lipids and carbohydrates is not more than temperature in changes. So
percentage of nutritional content was not so effected by light.
EFFECT OF MEDIA ON NUTRITIONAL CONTENT OF ALGAE:
Media of different concentrations i.e., F/1, F/2, F/4 were prepared. Algal culture was done separately in each
media. After 2 days its nutritional content was estimated by spectrophotometer. Finally a graph is plotted
against media and percentage of nutritional content. .
TABLE 7 EFFECTS OF MEDIA ON NUTRITIONAL CONTENT OF ALGAE.
S.l.
No
Media
(F/)
% of
Protein
% of
Lipid
% Carbo
hydrate
1 1 30.5 6.5 6
2 2 34 7 6.2
3 4 29.5 6.2 5
The graph obtained indicates maximum percentage of protein, lipid and carbohydrate is observed in F/2 media
than F1 & F4. This implies that media utilization will also effect the percentage of nutrition in the cells of algae
VI. Discussion
1. Attention was paid on to environmental parameters such as temperature, light, and nutritional suipplement
to the algal culture on their counts and multiplication
2. The environmental parameters like temperature light and salinity not only effect the and cell count but also
it influences on the synthesis of Aminoacids. The identified Aminoacid are mentioned in results.
3. The optimal temperature for phytoplankton cultures is generally between 20°C and 24°C, Most commonly
cultured species of micro-algae tolerate temperatures between 16°C and 27°C. Temperatures lower than 16°C
will slow down growth, whereas those higher than 30°C are lethal for a number of species. Algal cultures can
be cooled by a flow of cold water over the surface of the culture vessel or by controlling the air temperature
with refrigerated air- conditioning units. Temperature will influence more not only on cell count of algae but
also the percentage of nutritional content i.e., decreased at low and high temperatures
0
10
20
30
40
0 2 4 6
%ofnutritioncontent
Media
Effect of Media on nutritional
content of algae

4. Marine phytoplankton is extremely tolerant to changes in salinity. Most species grow best at a salinity that is
slightly lower than that of their native habitat, which is obtained by diluting sea water with tap water, Salinities
of 20-24 g.l-1
have been found to be optimal.
5. The optimum growth for algal species is 2000 lux maintained in indoor cultures of microalgae culture light is an
important factor for the growth of algae .It effects the not only cell count but also the percentage of nutrients in
the cells when light is altered nutrients compositions are utilized . Carbohydrate is more consumed than lipid
and carbohydrates.
6. Nutrients metabolism and cell count identified by alterations of the compositions of media from F/1 to F/4. This
results in increased cell count (5.2 millions) than F/1 and F/4 when culturing in F/4 percentage of carbohydrate
used is more than lipid and carbohydrate. It was identified in graph which was plotted after 2 days.
7. Micro-algae is an essential food source in the rearing of all stages of marine bivalve molluscans (clams,
oysters, scallops), the larval stages of some marine gastropods, larvae of several marine fish species and
penaeid shrimp, and zooplankton.
8. The amount of hatched Artemia cysts to feed will depend on the density of shrimp in the tanks. Start feeding
during mysis, 3. 1 gram of dry cysts of 90% to 95% hatch rate will yield 218,700 Nauplii or approx. 5 cc's. A 50
ton tank will require 50 grams dry weight, which will yield approx. 10,900,000 Nauplii or approx. 250 cc's on
the first day and increase of 5-20% per day depending on the consumption to a maximum of 454 grams of dry
cysts per day. Divide the total amount into several feedings throughout the day.
9. Algae are added during the non-feeding nauplius stage so that algae are available immediately upon molting
into the protozoea stage. Algal species most often used are Chaetoceros gracilis, and Skeletonema costatum. As
feeding preference changes from primarily herbivorous to carnivorous during the mysis stages, the quantity of
algae is reduced.
VII. Conclusion
Aquaculture is one of the commercial practices done to culture shellfish, finfish, shrimps, prawns etc.
In shrimp hatcheries live feed like Microalgae cultured, which has an major impact on the growth of shrimps.
The microalgae are cultured in indoor cultures and outdoor cultures. Its growth can be estimated by
haemocytometer. The growth rate on cell count can be used to analyse the amount of algae to be given to
hatcheries. When different environmental conditions are altered i.e. temperatures, light, salinity, ph; variations
in the cell count and nutritional content has been observed which was shown graphical representation. These
parameters also influence the hatching percentage and nutritional value of Algae. From the results obtained it is
found that for both Algae are highly influenced by environmental conditions. At optimum conditions maximum
cell quality and quantity is observed than at minimum and maximum environmental conditions. The present
study shows how the growth of live feed influences the growth of shrimp in hatcheries. If researchers would
find better techniques to improve the quality of cell environment, we expect good quality live feed to the aqua
culturist.
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