Papers by Sudhir Kumar Das
Indian Journal of Geo-Marine Sciences
The growth, mortality, and stock assessment of Arius arius were estimated based on monthly length... more The growth, mortality, and stock assessment of Arius arius were estimated based on monthly length-frequency analysis data collected from the Hooghly-Matlah estuary of West Bengal, India from April 2017 to March 2018. The estimated growth parameters were as L ∞ = 278 mm, K = 0.97 yr-1 , and t 0 =-0.0889 years. The different mortality coefficients Z, M, and F were obtained as 5.25 yr-1 , 1.79 yr-1 , and 3.46 yr-1 , respectively. The calculated exploitation ratio (E) was found as 0.66, and the M/K value as 1.845 indicating overexploitation of the fish. The recruitment was found throughout the year with two peaks and the value of L c was found at 56.00 mm. The estimated virtual population analysis (VPA) indicated that the highest fishing mortality (F) of 3.4499 was observed at the 190-200 mm length class, followed by 3.2393 from the 180-190 mm length class. The fishery was found at the overexploitation level and measures are needed to regulate it for promoting its sustainability.
Growth, mortality and exploitation status of Otolithoides pama (Hamilton, 1822) from Hooghly-Matlah estuary of West Bengal, India
Regional Studies in Marine Science
Abstract The growth, mortality and exploitation status of Otolithoides pama collected from the Ho... more Abstract The growth, mortality and exploitation status of Otolithoides pama collected from the Hooghly-Matlah estuarine system of West Bengal, India from November 2016 to April 2018 were estimated. The sample specimens were collected from the artisanal fishery, mainly from drift gillnets and bagnet with mesh size 15-70 mm and the length-frequency distribution was analysed employing the FiSAT programme. The growth parameters L α, K and t 0 were estimated at 418 mm, 0.58 yr − 1 and -0.1356 years, respectively. The lengths of the fish at the end of 1st, 2nd, 3rd, 4th and 5th year were recorded as 202, 297, 350, 380 and 397 mm, respectively. The total mortality (Z), natural mortality (M) and fishing mortality (F) were 4.16, 1.14 and 3.02 yr−1, respectively. The exploitation level (E) was observed as 0.73 which surpassed the optimization value of 0.5 considered for sustainable fisheries. The present study revealed that the fishery is overexploited and calls for an urgent need to reduce the fishing pressure to accomplish a sustainable fishery.
A Benzoxazole-Based Smart Molecule for Relay Detection of Zinc and Phosphate Ions and its Implication Towards Molecular Logic Gate Constructions
SSRN Electronic Journal
International Journal of Current Microbiology and Applied Sciences, 2020
The study was carried out with an objective to assess the technology of enhancement of fish produ... more The study was carried out with an objective to assess the technology of enhancement of fish production by incorporating Minor Carp Sps. in Composite fish culture system. The experiment was conducted for ten months from June, 2018 to March, 2019 in nine earthen ponds of 0.3 ha (3 no. ponds), 0.4 ha (3 no. ponds) & 0.5 ha (3 no. ponds) of three different villages of Angul district. In the first phase Pre-stocking pond preparation methods are followed i.e. removal of predatory and weed fishes by bleaching powder (10 mg/l chlorine) and then basal fertilization (3 tonn cow dung and 30 kg single super phosphate / ha) were carried out before stocking of fingerlings (Jena et al., 2005). Three different species combinations were taken i.e. Control (T1) (Catla : Rohu :Mrigal) at the ratio of 40:30:30 @ 10000 no. /ha and culture for 10 months. In Recommended practice incorporation of Puntius sarana @ 10 % or 1000 no./ha in the Major Carp system i.e. (Catla :Rohu :Mrigal: Puntius) at the ratio of 40:30:30:10 @ 10000 no. / ha and culture for 6 months (T2). Incorporation of Puntius sarana @ 20 % or 2000 no./ha in the Major Carp system i.e. (Catla :Rohu :Mrigal) at the ratio of 40:30:30:20 @ 10000 no. / ha and culture for 6 months (T3). In farmers practice they usually stocked mixed seeds (35-40) mm size of Indian Major Carps and not adopting the scientific Pisciculture practices. In recommended practice the farmers were provided with Complete technical support of raising of the minor Carp Species i.e. Puntius sarana through proper post stocking management measures to utilize the total food space available in the pond environment. Health management aspects were assessed by periodic sampling. Fish yield was recorded after harvesting. About 2.5-3 meter water depth was maintained throughout the study period. Water samples were collected from the ponds at 15-day intervals between 07:00 and 08:00 h and analyzed for important parameters were measured following standard methods (APHA, 2014). Then the data like fish weight (gm), fish yield (Quintal/hectar), Survivability percentage, average net return and B: C was recorded and analysed using statistical tools like Average mean value and percentage. From the results of the analysis it is found out that mean weight gain of Puntius sarana / Olive barb were higher in T3 compared to T1 and T2. Daily weight gain and net fish yield in T2 and T3 were also higher than T1. In the present study stocking of Puntius sarana & IMC fingerlings of recommended size and density along with adopting the post stocking management schedules resulting the increase in Avg. weight of Olive barb upto 315 gm where as the weight of IMC remains 420 gm during harvesting. Net profit of Rs. 1,67,363 was obtained from this technology with benefit: cost (B: C) ratio of 2.75 against Rs. 76,197 and 1.83 respectively from Control (T1) due to more fish growth & production. Similarly 56.55 % increase in fish yield was also observed in this technology (26.3 q/ha) against Control (16.8 q/ha).
Indian Journal of Fisheries, 2021
Pama croaker, Otolithoides pama (Hamilton, 1822) is one of the commercially important demersal fi... more Pama croaker, Otolithoides pama (Hamilton, 1822) is one of the commercially important demersal fish of Hooghly-Matlah estuarine system, West Bengal, India. Reproductive biology of 618 samples of O. pama (Hamilton, 1822) collected from the Hooghly-Matlah estuarine system of West Bengal, India for a period of 18 months (November 2016 to April 2018) was investigated. The total length (TL), body weight (BW) and ovary weight (OW) of the samples varied from 100-384 mm, 7.29-470.71 g and 1.5-29.49 g, respectively. The sex distribution was 1 male for 1.07 female and the ratio did not differ statistically. The length at first maturity (Lm) was recorded as 183 mm for males and 196 mm for females. The reproductive activity was found throughout the year with three peak spawning season with high gonadosomatic index (GSI) values, i. e., during February-March, June and September-November. The absolute fecundity ranged from 4652 to 170688 eggs (24950±32441.2) and relative fecundity ranged from 96 t...
Biological parameters and morphological studies of Arius arius (Hamilton, 1822) in Hooghly-Matlah estuary, West Bengal
Dynamics of some bio indices (carapace width [CW] and body weight [W] relationship, relative cond... more Dynamics of some bio indices (carapace width [CW] and body weight [W] relationship, relative condition factor [K n ]) of mud crab Scylla serrata (Forsskal, 1775), collected from the Hooghly-Matlah Estuary of West Bengal, were studied for a period of one year. A total of 325 specimens were collected (CW 44 – 120 mm, W 20 – 210 g) and studied. The CW and W relationship was found as W = 0.0006 CW 2.665 for male and W = 0.001 CW 2.561 for female. The b value was found relatively higher in male indicating better growth rate compared to females. Moreover, the growth pattern was allometric. The monthly mean K n was 0.968 to 1.058 for males and 0.962 to 1.054 for females that significant varied ( P < 0.05) among sampling months.
International Journal of Advance Research, Ideas and Innovations in Technology, 2019
My dissertation work has been divided into 8 chapters, Chapter 1: Introduction: In this chapter, ... more My dissertation work has been divided into 8 chapters, Chapter 1: Introduction: In this chapter, a general introduction of my dissertation work has been given. The materials used in my projects such as coarse aggregate, fine aggregate, glass fibre, fly ash and other constituents of fly ash-based glass fibre reinforced concrete have been focused. The properties of the construction materials have also been stated in brief along with advantage and disadvantage of glass fibre concrete. Chapter 2: Objectives and Aims: In India, all old glass materials are considered as waste materials. It is disposed to the disposal ground just like other waste materials. The old glass materials can be recycled in factories. These recycled glass materials become an important ingredient for making GFRC. The primary aim of using glass fibre is to examine the strength of concrete made with glass fibre in comparison to plain concrete. The secondary aim is to examine the economy of GFRC for which an economic ...
Length Composition of Commercially Important Fin Fishes During Monsoon Period at Hooghly-Matlah Estuarine System, West Bengal, India
A study has been carried out to know the length composition of commercially important fishes at H... more A study has been carried out to know the length composition of commercially important fishes at Hooghly-Matlah estuarine system of West Bengal, India during monsoon period (June-September 2013). A total of 28 commercially important species were recorded during the study. The most commercially important species of the Hooghly-Matlah estuary were recorded Tenualosa ilisha, Harpadon nehereus, Otolithoides pama, Trichiurus lepturus, Coilia ramcarati, Chelon parsia, Lates calcarifer, Polynemus paradiseus, Sillaginopsis panijus and Eleutheronema tetradactylum. The main means of exploitation was found to be the bag net, trawl net, large seine, small seine, purse seine, drift net, lift net, cast net, set-gill net, set-barrier, traps, and hooks and lines. The species like Tenualosa ilisha, Otolithoides pama, Lates calcarifer, Setipinna phasa, Trichiurus lepturus, Sillago sihama, Sardinella longiceps were exploited below their size at first maturity. The species like Polynemus paradiseus, C...
An attempt was made to study dynamics of length-weight relationship (LWR), relative condition fac... more An attempt was made to study dynamics of length-weight relationship (LWR), relative condition factor ( K n ) and gonado-somatic index (GSI) of Labeo calbasu from the wetlands of South 24 Parganas district of West Bengal, India. A total of 275 fish specimens (130 to 430 mm) were examined over nine months from December 2006 to August 2007. Specimens were categorized into two groups based on the size at first maturity of 260 mm. The LWR was recorded W = 0.007269 L 3.181 for Group A (<260 mm) and W = 0.007367 L 3.031 for Group B (≥260 mm). The individuals exhibited isometric growth. The monthly mean K n values varied from 0.924 to 1.141 with an average value of 1.059. The mean monthly values of GSI varied from 0.544 to 3.301 for male and 0.560 to 9.649 for female. There was significant variation ( P < 0.05) in the mean values of GSI in different months between sexes.
Temporal variations in bio-indices of Oreochromis niloticus (Linnaeus, 1758) in East Kolkata wetlands, India
Journal of the Inland Fisheries Society of India, 2021
Dynamics of temporal foraging and feeding index of Labeo rohita (Hamilton, 1822) in East Kolkata wetlands, a Ramsar site
Journal of the Inland Fisheries Society of India, 2020
Physical Chemistry Chemical Physics, 2020
This report outlines the synthesis of an ionic liquid-based pH-responsive indicator to sense acid... more This report outlines the synthesis of an ionic liquid-based pH-responsive indicator to sense acids or bases in non-polar as well as polar solvents. This has further scope to investigate the dissociation constants of several acids in non-polar media.
Indian Journal of Fisheries, 2020
The present study analysed the morphometric and meristic characters of Otolithoides pama (Hamilto... more The present study analysed the morphometric and meristic characters of Otolithoides pama (Hamilton, 1822) collected from the Hooghly-Matlah estuarine system of West Bengal, India. A total of 618 specimens (298 males and 320 female) were collected during the period of 18 months from November 2016 to April 2018 with length ranging from 100-384 mm and weight 7.29-470.71 g, respectively. The analysis of 14 morphometric characters revealed that standard length has the fastest growth rate when compared to total length, while eye diameter has the lowest growth rate when compared with head length. A high degree of significant positive correlation with the ‘r’ values ranging from 0.978 to 0.997 was observed among different morphometric characters of O. pama. Among nine of the meristic counts, the coefficient of variation was found to be highest in anal fin rays (6.31%) and minimum in dorsal fin rays (1.12%). Based on the meristic counts, the fin formula of O. pama from the present study can ...
Feeding intensity and diet composition of Indian shad Tenualosa ilisha (Hamilton, 1822) occurring in Hooghly estuary of West Bengal
Journal of the Inland Fisheries Society of India, 2020
International Journal of Current Microbiology and Applied Sciences, 2020
International Journal of Current Microbiology and Applied Sciences, 2020
The Journal of Physical Chemistry C, 2020
In this report, a novel ionic-liquid-comprised group of uniform materials based on organic salt (... more In this report, a novel ionic-liquid-comprised group of uniform materials based on organic salt (GUMBOS) has been assembled by incorporating pyrene butyrate with quaternary phosphonium ionic liquid (IL) via simple ionexchange process. By reprecipitation method, we have developed a new kind of water suspended crystalline pyrene assimilated nanoparticles, i.e., nanomaterials derived from a GUMBOS (nano-GUMBOS). The nanocrystallinity and the molecular level stacking of the aromatic fluorophores inside the nanoparticles have been confirmed by several spectroscopic, microscopic and calorimetric measurements. The fluorophore moieties within the nanocrystal have been found to show high propensity to undergo self-association upon excitation and exhibit new kind of excited state association induced emission (ESAIE). Here we have demonstrated the association of organic molecules in their electronic excited state (we name this as exciaggremer formation) for the first time which is attributed to something beyond the process of simple excimeric dimerization. Due to the presence of bathochromically shifted strong aggregation induced emission and hydrophobic scaffolds, this nanoparticle further promotes the fluorescence resonance energy transfer to several hydrophobic organic dyes unlike the free fluorophore in bulk solvent. Moreover, some soft anions like iodide can assist disintegration of the organic moieties form the ionic-liquid backbone that results in ion-exchange mediated freeing up of the fluorophores. This ion-exchange mediated disintegration can indeed become a new dimension in the area of sensing and delivery.
Studies on the Food and Feeding Habits of Chelon Planiceps (Valenciennes, 1836) from Hooghly Matlah Estuary, West Bengal
JOURNAL OF AQUACULTURE IN THE TROPICS, 2020
Regional Studies in Marine Science, 2019
The food and feeding habits of Otolithoides pama collected from three different sites of Hooghly-... more The food and feeding habits of Otolithoides pama collected from three different sites of Hooghly-Matlah estuary, West Bengal, India for a period of 18 months (November 2016 to May 2018) were studied. Both fishes and prawns have dominated the food items in the gut. A very high percentage of empty stomach frequently occurred throughout the year. The species is a macrophagous carnivore and feeds mainly small fishes and prawns. The feeding intensity was more in juveniles stages with prawns and fishes dominated the gut contents while teleosts preferred by the adults. Among the teleosts the main food items were Otolithoides pama, Harpadon nehereus, Secutor insidiator, Sardinella spp., Setipinna spp., other sciaenids like Johnius spp., other clupieds like Tenualosa ilisha, Ilisha megaloptera, Polynemus paradesius, Arius spp., mullets like Mugil and Chelon spp., Rastrelliger kanagurta, Coilia dussumieri, Bregmaceros maclellandi, Trichiurus spp., and unidentified teleosts body parts. Among non-penaeid prawns Acetes spp. was the most dominant food items, among penaeids Parapenaeopsis spp., Metapenaeopsis spp., Metapenaeus spp., Parapenaeus spp., Solenocera spp. constitute food items. GaSI was found high during February, June and October and low during July-August for both the sexes. The monthly mean RLG values were highest during October for male and March for female. Both seasonal changes in diet composition and ontogenetic changes were noticed between juveniles and adults.
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Papers by Sudhir Kumar Das