We introduce the notions of fuzzy hypersemigroup, fuzzy hypergroup, fuzzy hyperideal, homomorphism, hyper congruence, fuzzy homomorphism, fuzzy hypercongruence. The purpose of this note is the study of some characterization of fuzzy hypersemigroup, fuzzy hyperideal of a fuzzy hypersemigroup and homomorphism and hypercongruence on a hypersemigroup.

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The astaxanthin level in the leaves of five dominant mangrove species, sampled from two different stations of Sager Island in western Indian Sundarbans region was studied during April, 2016. The two sampling stations selected at the northern and southern tips of the island exhibited drastic variation with respect to aquatic salinity, although other parameters like surface water temperature, pH, D.O. and nutrients were more or less uniform. Relatively higher astaxanthin level was observed in the high saline zone (southern tip) of the island, which indicates the regulation of astaxanthin level in the mangrove plants by ambient aquatic salinity. The inundated leaves of the selected mangrove plants showed more astaxanthin level in comparison to the exposed ones. The astaxanthin content of the mangrove leaves was in the order Heritiera fomes > Avicennia alba > Avicennia marina > Avicennia officinalis > Sonneratia apetala in both the sampling stations which points towards the species specificity of the carotenoid pigment.

This paper attempts to conduct a survey in the commonly edible fi nfi sh species collected from EKW during three seasons of 2016. Eastern Kolkata Wetland (EKW) is the only designated Ramsar Site in West Bengal The wetland with an area of about 12, 500 hectares act as natural kidneys and is also the natural sewage treatment plant for the ever increasing city of Kolkata. This multiple-use wetland lies on the eastern fringes of the city and includes a garbage dump known as Dhapa Square Mile, a mosaic of vegetable fi elds, a series of 300-odd fi shponds connected by major and secondary canals, paddy fi elds, wholesale markets, a few roads, and 43 villages with an ever increasing population. The fi shponds produce some 13,000 tons of fi sh annually, whose yield is at 2-4 times higher than average fi sh ponds, is among the best of any freshwater pisciculture in the country. Some 150 tons of vegetables per day are harvested from small-scale plots irrigated with waste water. It is essential to conduct a survey of the bioaccumulation pattern of toxic heavy metals such as Pb, Cd, Cr, and Hg in the fi nfi sh species commonly consumed by people in this region. The survey was carried out during three seasons of 2016. The accumulated toxic heavy metals were found in the order Pb > Cd > Cr > Hg. The seasonal order was Monsoon > Postmonsoon > Premonsoon. The seasonal variation might be the effect of monsoonal runoff from the highly urbanized and industrial city of Kolkata that convey huge quantum of effl uents in the water of EKW. Such study has immense importance as fi shes are consumed by a large percentage of the people in and around Kolkata. This study would also provide a roadmap for researchers and policymakers to identify and implement effective and sustainable measures to counteract the increasing trends of pollution levels in natural ecosystems

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