NOPR Collection:

From biology to management: A critical review of Hilsa Shad (Tenualosa ilisha)

Tue, 01 Aug 2017 00:00:00 GMT

Title: From biology to management: A critical review of Hilsa Shad (Tenualosa ilisha) Authors: Dutta, Sachinandan; Hazra, Sugata Abstract: Major studies relating to Hilsa fishery has been concentrated in Bay of Bengal part of Bangladesh and India, as the distribution of this species is maximum in this region. Important biological aspect of this species has been studied during 1950s to 1960s. Hilsa is a migratory fish. Hence, the migration study is a vital research area of this species. Recently population dynamics and stock assessment study has been carried out for the management of Hilsa fishery. Ecological and economic approaches of this species are being less studied area. This paper tries to understand the species from ecological, biological, social and economic point of views. Page(s): 1503-1510

Emergence of eusociality in aquatic environment: Synalpheid shrimps show the way!

Tue, 01 Aug 2017 00:00:00 GMT

Title: Emergence of eusociality in aquatic environment: Synalpheid shrimps show the way! Authors: Subramoniam, T. Abstract: Life history traits such as direct development and restricted dispersal, ecological specialization to live in the host sponge, defending the valuable host resource, as well as selective breeding by one or more queens contribute to the evolution of eusociality in marine Crustacea, in particular, the synalpheid shrimp. This review critically examines the preconditions necessary for the evolution of complex social behaviours and structures including eusociality in these symbiotic shrimps and other crustacean species. Page(s): 1511-1518

Mass flow deposit south of Central Andaman Trough, Andaman Sea: evidence from sub bottom profiler records

Tue, 01 Aug 2017 00:00:00 GMT

Title: Mass flow deposit south of Central Andaman Trough, Andaman Sea: evidence from sub bottom profiler records Authors: Tripathi, S. K.; Das, S.; Meitei, S. I.; Rajarama, K. N.; Resmi, S.; Tewari, H.; Kashyap, M. P.; Pradhan, R.K. Abstract: A total of 2577 line-km sub bottom profiler data recorded over East Andaman Basin, Sewell and Mergui ridges, south of Central Andaman Trough, Andaman Sea, revealed distinctive echo types representing different seabed material and seafloor morphology. Echo Type I, Type-IIIA, Type-IIIB and Type IVA prevail over ridges, slopes of Sewell rise and Mergui ridge. Scarp head and slides (Types II, Type IVA) occur extensively over the entire slope areas of the ridges. Whereas in East Andaman Basin area, top sub bottom reflectors are almost flat in all transects and downward it becomes wavy, chaotic and hummocky in nature. This means that present day depositional environment is relatively calm as compared to bottom unit, which means the bottom most units is formed by the mass flow deposit. These evidences from echo pattern, shows a successive slope failure and supports frequent seismic shaking related to the rifting of Central Andaman Trough. Page(s): 1519-1527

An impact of sewage pumping failure on coastal water quality of Mumbai, India

Tue, 01 Aug 2017 00:00:00 GMT

Title: An impact of sewage pumping failure on coastal water quality of Mumbai, India Authors: Mardikar, Trupti; Vijay, Ritesh; Gupta, Indrani; Kumar, Rakesh Abstract: A model was conceptualised to emulate the behaviour of coastal water during high and low tides and the impact of the pump failure in present and projected future scenarios was estimated on it. The model was validated before being used for failure scenario simulation. The study indicates that potential adverse effects on water quality are imminent in case of sewage pumping station failure and warrants better planning and management in terms of diversionary and evacuation routes and preparedness plans. Page(s): 1528-1538