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Muralidhar, M.
- Acute Toxicity Bioassays of Cadmium and Mercury on the Juveniles of Asian Seabass Lates calcarifer (Bloch)
Abstract Views :610 |
PDF Views:154
Authors
V. Mohan Raj
1,
A. R. Thirunavukkarasu
2,
M. Kailasam
2,
M. Muralidhar
2,
R. Subburaj
2,
P. Stalin
2
Affiliations
1 Sir Theagaraya College, PG & Research Department of Zoology, Chennai, Tamil Nadu, IN
2 Central Institute of Brackishwater Aquaculture, 75, Santhome High Road, R.A. Puram Chennai-600 028, Tamil Nadu, IN
1 Sir Theagaraya College, PG & Research Department of Zoology, Chennai, Tamil Nadu, IN
2 Central Institute of Brackishwater Aquaculture, 75, Santhome High Road, R.A. Puram Chennai-600 028, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 6, No 4 (2013), Pagination: 4329-4335Abstract
The present study was undertaken to investigate the acute toxicity of two heavy metals cadmium and mercury in the juveniles of Asian seabass Lates calcarifer (Bloch) which is considered as an important candidate fish species for brackishwater and freshwater aquaculture. Experiments for the bioassay were performed in static bioassay test condition according to the standard guidelines. The experiment was carried out in the FRP tanks under laboratory condition. The behavioral changes in the fish were observed for all test concentrations of both cadmium and mercury. Median lethal concentrations (LC50) were calculated for 24h, 48h, 72h and 96h by probit analysis. The LC50 values for 96h and 95% confidence intervals for the juveniles of seabass L. calcarifer showed 6.08 ppm for cadmium and 1.03 ppm for mercury. Furthermore, the exposed specimens showed dose and duration dependent, abnormal behavior and hyperactivity. Mercury indicated more toxic than cadmium for seabass L. calcarifer.Keywords
Lates calcarifer, Heavy Metals, Cadmium, MercuryFull Text
References
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- Design and Analysis of Broadband Beamspace Adaptive Arrays Using Fractional Fourier Transform
Abstract Views :273 |
PDF Views:0
Authors
Affiliations
1 Dept. of Electronics and Communication Engineering, College of Engineering, (AITAM), Tekkali, IN
2 Dept. of Electronics and Communication Engineering, AUCE, Visakhapatnam, IN
3 Dept. of Electronics and Communication Engineering College of Engineering, (AITAM), Tekkali, IN
1 Dept. of Electronics and Communication Engineering, College of Engineering, (AITAM), Tekkali, IN
2 Dept. of Electronics and Communication Engineering, AUCE, Visakhapatnam, IN
3 Dept. of Electronics and Communication Engineering College of Engineering, (AITAM), Tekkali, IN
Source
International Journal of Electronics and Communication Engineering, Vol 5, No 2 (2012), Pagination: 193-206Abstract
The beamwidth of a linear array depends on number of elements in the array and frequency of the input signal. At present designing of wideband antennas and beamformers became important in the fields of microphone arrays intended for teleconferencing, in transmitting or receiving spread spectrum signals, crip signals etc. A beamspace adaptive planar array for broadband beamforming is proposed based on the filter-and-sum beamforming technique and the required filters are implemented using fractional Fourier Transform. A detailed design method was provided for adaptive arrays and simulation results are provided for the proposed method. The results obtained shows that fractional Fourier Transform filter method is superior in interference rejection compared to conventional finite impulse response filter method.Keywords
Antenna Arrays, Linear Arrays, Broadband Antennas, Adaptive Antennas, Constant Beam Width, Interference Rejection, Filter–and–Sum Beamformer, Fractional Fourier Transform (FrFT)
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- Phosphorus Dynamics, Eutrophication and Fisheries in the Aquatic Ecosystems in India
Abstract Views :200 |
PDF Views:97
Authors
Affiliations
1 C-218, Pocket 7, Kendriya Vihar-II, Sector 82, Noida 201 304, IN
2 Department of Environmental Science and Limnology, Barkatullah Vishwavidyalaya, Bhopal 462 026, IN
3 Central Inland Fisheries Research Institute, Barrackpore, Kolkata 700 120, IN
4 Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar 751 002, IN
5 Central Institute of Brackishwater Aquaculture, Chennai 600 028, IN
1 C-218, Pocket 7, Kendriya Vihar-II, Sector 82, Noida 201 304, IN
2 Department of Environmental Science and Limnology, Barkatullah Vishwavidyalaya, Bhopal 462 026, IN
3 Central Inland Fisheries Research Institute, Barrackpore, Kolkata 700 120, IN
4 Central Institute of Freshwater Aquaculture, Kausalyaganga, Bhubaneswar 751 002, IN
5 Central Institute of Brackishwater Aquaculture, Chennai 600 028, IN
Source
Current Science, Vol 108, No 7 (2015), Pagination: 1306-1314Abstract
Phosphorus (P) is the most limiting nutrient element in the inland aquatic ecosystems. In Indian context also, many water bodies are deficient in the readily available form of the nutrient. The present effort was to understand the P-dynamics in relation to fish production. While feed and fertilizer are the main inputs of P for the culture systems, the element is accumulated in the bottom mud to a great extent. Fish harvests accumulate 10-20% of P. In culture systems with water exchange, significant amount of P flows with the discharge/exchange water. The wetlands, rivers and reservoirs in the country show gradual accumulation of the element and eutrophication is becoming a serious concern mostly due to anthropogenic activities. East Kolkata wetlands are a unique example where fish is used as the bio-remediating agent. In general, mangrove plants also have good capacity to recover from adverse effects of commercial shrimp farming. There is scope to utilize advanced mathematical models to optimize the production and at the same time, conserve the resources. As a whole, there is ample scope for improvement and to understand the P-dynamics in different water resources of India.Keywords
Brackishwater, Eutrophication, Freshwater, Phosphorus Dynamics, River.Full Text