Physico-chemical parameters and Ichthyofauna diversity of Arasalar estuary in southeast coast of India

Abstract

The physico-chemical changes may have the tendency to accumulate in the various organs of estuarine organisms, especially fish which may in turn enter into the human metabolism through consumption causing serious hazards. Hence, the present study was carried out to determine the physico-chemical characteristics of water and Ichthyofauna in Arasalar estuary in southeast coast of India for the period of 1 year during September 2012-August 2013. The environmental parameters such as, temperature, pH, salinity, DO, silicate, nitrate and phosphate were observed from Department of Zoology, Rajah Serfoji Goverment College, Thanjavur, Tamil Nadu, India. During the period of study, air temperature varied from 28.8 to 35°C. The surface water temperature also varied from 25 to 31.5°C. The monthly mean values of hydrogen ion concentration of water varied from 7.1 to 8.2. The salinity of water varied from 5.5 % to 34. Dissolved oxygen in Arasalar estuary was varied from 3.5 to 7.2 mg/l. The total phosphorus varied from 0.29 to 2.15 lg/1. The nitrate varied from 0.47 to 3.75 lg/l. The silicate content varied from 28.25 to 98.74 lg/l. Totally 866 fishes were collected belonging to 4 orders and 5 families. Mystus gulio was found to be the dominant species (25.40 %) in the study area.

Assessment of Physico-chemical Characteristics of Vairtarna Estuary of Palghar, (M.S.) India

“…It also controls the reproduction, diversity, migration and behavioral characteristics of animals and plants. Similar findings were also recorded by Ravichelvan et al (2015) in the Uppanar Estuary of Cuddalore, South East Coast of India and Raju et al (2017) of Arasalar estuary in southeast coast of India.…”

Impact of Ship Breaking Activities on the Water Quality at the Coastal Area of Chattogram, Bangladesh

“…The quantity of electrical current and the sum of all dissolved ions in water bodies are known as electrical conductivity [57,58]. In the current investigation, the average EC value was 2028.87 µS/cm.…”

“…Surface waters that are not contaminated typically have a high concentration of dissolved oxygen. Discharge of the wastes that require oxygen can quickly remove dissolved oxygen from the water [58]. The amount of dissolved oxygen in water is also generally reduced by other inorganic compounds such nitrites, ammonia, hydrogen sulfide, ferrous iron and other oxidizable chemicals.…”

“…The global ocean circulation is impacted by the salinity of oceans, as changes in density occur due to differences in both salinity and temperature at the ocean's surface. These variations in density affect buoyancy, leading to the sinking and rising of water masses [58]. Since more salinized waters become less soluble in CO2, changes in ocean salinity are believed to be involved in changes in the amount of CO2 in the atmosphere.…”

Occurrence of Coliforms in Microplastic Associated Biofilm in Estuarine Ecosystem

“…The phosphate concentration in Adyar estuary is attributed with sewage disposal [54]. However, the less phosphate content at estuary mouth might be due to the limited flow of fresh water, high salinity, and utilization of phosphate by phytoplankton [56,57].…”