DSpace Community:http://inet.vidyasagar.ac.in:8080/jspui/handle/123456789/21552024-03-29T09:18:26Z2024-03-29T09:18:26ZStudies on seasonal and sex variations in biology and anatomical peculiarities of certain Indian major carpsDas, Susmitahttp://inet.vidyasagar.ac.in:8080/jspui/handle/123456789/63372022-01-21T06:05:18Z2021-11-09T00:00:00ZTitle: Studies on seasonal and sex variations in biology and anatomical peculiarities of certain Indian major carps
Authors: Das, Susmita2021-11-09T00:00:00ZAvailability of edible marine Molluscan Fauna found at Digha coast and studies their nutritional valueDas, Manotoshhttp://inet.vidyasagar.ac.in:8080/jspui/handle/123456789/63142021-12-10T10:10:31Z2021-10-05T00:00:00ZTitle: Availability of edible marine Molluscan Fauna found at Digha coast and studies their nutritional value
Authors: Das, Manotosh
Abstract: The present study from January, 2013 to July, 2017 shows the short coastal line (158.2
km) of West Bengal offers a wide variety of biotic components which are used by the
local people for their sustenance. Shell fish collection is an old occupation from the past
to till date in this region. At present, the total population of India is about 127 crores. A
huge number of our children among this high population have been suffering from malnutritional
diseases. They need highly protein enriched food and molluscs meat is a very good
source of protein. In dry condition Loligo duvauceli contains 12.17% protein,
Octopus macropus - 12.71%, Sepia aculeata - 11.48% and Sepiella inermis - 14.53%
protein. India harvested 0.04 lakh tones of bivalves, 0.02 lakh tones of gastropods and
1.73 lakh tones of cephalopods from Indian marine resources in the year 2013-2014.
Molluscs species are available at Digha coast more or less throughout the year. During
post monsoon period from the month of September to February, the marine molluscs
population density is highest. Availability goes down lowest in monsoon period from the
month of June to August and density is optimum in pre-monsoon season, ranges from the
month of March to May. At Digha, the beach is about 10 km long from Paschim
Gadadharpur to Digha Mohana and from the study it is collected 54 varieties of bivalve
species, 35 varieties of gastropod species and 4 varieties of cephalopod species. Out of
them 12 bivalves, 2 gastropods and 4 cephalopods are edible species as per local survey
in 5 coastal villages located around Digha coast such as Padima, Mirjapur, Dattapur,
Mandala and Raghusardarbard but local people consume molluscs meat very little
because they are getting different varieties of marine fishes at low price. Few tribal
people consume molluscs meat adequately at Digha during winter season. In Southern
part of India especially Kerala, Karnataka, Andhra Pradesh, Tamilnadu etc, the poor
people including fisher folk population considered the marine edible molluscs meat as
their food. But at Digha in future, it is expected the edible marine molluscs meat may be
eaten by local poor people adequately due to containing high protein in comparison with
marine fishes and scarcity of marine fishes due to depletion of marine fishery resources.
This study is conducted to make awareness among the people at Digha especially poor
coastal villagers and fisher folk communities about nutritive values of edible marine
molluscs meat and its beneficial effect on human body.2021-10-05T00:00:00ZBiology, captive maturation and breeding of Chameleon Dwarf, Badis badis (Hamilton, 1822)Dutta, Mohuahttp://inet.vidyasagar.ac.in:8080/jspui/handle/123456789/62812021-11-03T09:32:00Z2021-09-24T00:00:00ZTitle: Biology, captive maturation and breeding of Chameleon Dwarf, Badis badis (Hamilton, 1822)
Authors: Dutta, Mohua
Abstract: Blue perch or Blue badis, Badis badis under Badidae family, is one of the
most highly demanding fish for both local and export market due to their chameleonic
habit. This species is somet imes sold under the trade name of ‘chameleon fish’ due to
its ability to rapidly change of colour, especially when breeding or stressed. But the
exporting trade is not sustainable because the trade is based on capture from nature. In
order to sustain the growth it is absolutely necessary at this point to shift the focus
from capture based fishery to culture based development with emphasis on scientific
intervention. There is some degree of uncertainty in the catch of a particular variety of
ornamental fish form natural water bodies. Thus, the present practice of exporting
native ornamental fishes based on natural collection alone is not a sustainable
practice. In the present study, eco-biology of the target species was studied for
domestication under captive condition. For captive maturation semi-natural habitat for
fish were made with the help of sandy bottom, gravels, stones along with plantation of
some of the ornamental plants. Morphological study revealed that the body of B.
badis slightly compressed and moderately elongated. Fin formula was recorded as D.
XIV-XVI/ 7-8; A. III/ 6-7; V. 6-8; P. 8-10; C. 13-14. The length weight relationship
of the fish is Log W= -5.043+3.133L and the r
2
value is 0.957. Present studies
indicated the 'b' value is more than '3' which shows the positive allometric growth.
The condition factor of the fish is 1.61 which indicates the good wellbeing of the fish
in the studied environment. The RLG value was found increased with the increase of
total body length. The average GaSI was found to be 4.76±1.27.The important groups
of phytoplankton during the study period in their diet included Navicula, Cosmarium,
Closterium and Fragillaria. Occasionally, zooplankton like Cyclops and Nematodes Tubifex were also provided. Sexual dimorphism is well marked by their colour
pattern, adult males display bright colour with 5 pairs (10 nos.) of black stripes visible
on the body. Female chameleon fish (B. badis) rate somewhere between drab and
plain most of the time. Mature males also develop extended dorsal, anal and caudal
fins. The gonad of the fish is small in length and slight yellowish in colour. 50% of all
female specimen attaining a length of 75-85 mm and weight of 6.50-7.75g was
matured. The breeding season of the fish extend from late July to December. The
Gonado-Somatic Index (G.S.I.) for the gravid females ranged from 0.037 to 0.15 with
an average of 0.077. Pre-spawning absolute fecundity of blue perch, Badis badis was
found out to 305.3 as mean and the range was 372 – 502. The minimum number of
ova produced was 116 in a female having a length of 27 mm and weight of 0.28 g. A
maximum of 518 numbers of ova was produced by a female having a length of 29 mm
and weight of 0.47 g. The male display a more intense colouration to display to the
female and they will pair off. The blue perch, B. badis are cave-spawners that form
temporary pair bonds. For this breeding tank is set using river sand and gravel for the
substrate and provided couple of upturned plant pots and broken earthen pot as
spawning sites. The water maintained soft and slightly acidic, the temperature set at
24 °C. A single pair or a group of adults can be used for breeding set up but for
multiple males several number of cave have to provide for each pair. To ensure a
higher rate of success 2-3 females to each male. During spawning male drag females
into the cave. A receptive female will enter and spawning takes place with 30-100
eggs. During this time female deposit eggs and male fertilize the egg by swimming
over them. After spawning takes place remove the female from the breeding tank as
the male may turn aggressive towards the female. The male shows parental care towards the eggs and fry, and defending the territory and fanning with the fins. The
eggs hatched after 2-3 days but the fry do not become free swimming until they are 6-
8 days old, and not leave the vicinity of the cave for another week or so after that. The
young fish are quite sedentary for the first few days. Microworm is an ideal initial
food, but once they are visibly swimming in the water column Artemia nauplii is used
to the diet thrice daily. The growth rate quite quick and once the larvae reach a size of
0.75 - 1 inch (2 - 2.5 cm) they moved into a larger aquarium for rearing. Water quality
parameters for rearing and spawning were analysed throughout the study periods.
There was no significant difference observed in all the water quality parameters
analysed, except the temperature which remained within a range of 20- 28
seasonal fluctuations. Hardness was in the range of 224.00 - 231.50 ppm, Total
alkalinity 177.75 -185.25 and pH in the range 7.13 -7.25. Dissolved oxygen range was
in range of 5.13 - 5.38 ppm.
o
C, having2021-09-24T00:00:00ZStudies on seasonal variations in biological, anatomical and biochemical aspects of some freshwater air-breathing fishes of IndiaSarkar, Ajantahttp://inet.vidyasagar.ac.in:8080/jspui/handle/123456789/62742021-11-01T06:48:05Z2021-09-28T00:00:00ZTitle: Studies on seasonal variations in biological, anatomical and biochemical aspects of some freshwater air-breathing fishes of India
Authors: Sarkar, Ajanta2021-09-28T00:00:00Z