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The article presents a study on the respiratory metabolism of fiddler crabs Uca annulipes and Uca triangularis of Visakhapatnam Harbor in India exposed to different test concentrations of heavy metals including copper, cadmium, and zinc. The study used Whatman 42 filter paper to filter sea water and Winkler's technique to obtain respiratory measurements. The results revealed that heavy metals inhibit the rates of respiration, however, the degree of inhibition depends upon the type of metal.

The article presents a study which aims to investigates the fiddler crabs Uca annulipes and Uca triangularis' tolerance on four heavy metals including mercury, cadmium, and zinc. The study collected fiddler crabs from Visakhapatnam and Bhimilipatnam, India, and conducte experiments such as static bioassays, and monitoring of harbor water's salinity, pH, and temperature. Results show that the harbor water in Bhimilipatnam contains zinc and copper, wherein it is on the safe level.

The level and content of different biochemical constituents were investigated over a period of one year (January-December 1982) in foot, gonad digestive gland complex and viscera of two tropical cerithiids, inhabiting two different regions of backwaters. Their seasonal indices exhibited bimodal pattern of cycling and this trend was more predominant in gonad digestive gland complex and foot. In all the body components of both species, the biochemical content was found to show considerable changes when compared to their levels. In both the cerithiids, the gonad digestive gland depicted remarkable variations with the season, followed by foot. The viscera did not show much variation when compared to other body components. The carbohydrates and glycogen of both the species showed a primary peak in March and a secondary peak in September indicating maturity of gonads. This was followed by a decline in their constituents which might be due to spawning. Lipid utilisation was also observed in both the animals next to carbohydrates and glycogen. Proteins were least utilised in the process of reproduction. Thus a carbohydrate-oriented metabolism was recorded in both the species. The results were compared with the other molluscs. [ABSTRACT FROM AUTHOR]

The rates of aquatic and aerial oxygen consumption of an intertidal tropical gastropod Morula granulate increases with increasing temperature. The temperature at which the breakdown occurred in their oxygen consumption was observed to be different, 45°C for aquatic and 42°C for aerial respiration. However, the aquatic rates of oxygen consumption were higher than the aerial rates at all temperatures studied. The aquatic and aerial Q values showed almost the same trend, higher at lower temperatures and vice versa. The results were discussed in relation to the habitat of the animal. [ABSTRACT FROM AUTHOR]