Early sight of Dolphins along Mumbai coast this year

Dolphins may have made an appearance along Mumbairsquos coastline earlier than usual this yearAs per a report in Hindustan Times conservation biologist and Malabar Hill resident Darshan Khatau who has been documenting the movement of the Indian Ocean humpback dolphin annually for the last four years said sporadic sightings of dolphins were usually seen from the second or third week of December annually up to last week of May just before the monsoon seasonldquoThis year they arrived unusually early during the third week of Novemberrdquo said Khatau He spotted three individuals off Malabar Hill from November 15 and 16 onwards and has been regularly photographing them sinceldquoIn previous years the maximum number of individuals has been 12 in one pod The early arrival could be due to shifts in ocean currents leading to more prey availability along the Mumbai coastrdquo he saidAlso ReadMumbai Rare bioluminescent waves at Juhu beach explainedLast Wednesday a video was circulated on social media by environmentalist Zoru Bhathena of an Indian Ocean humpback dolphin spotted off Juhu beachMarine biologists concurred with Khataursquos finding but said it cannot be verified as no official survey or study to monitor the population or behaviour of this species was carried out along Mumbai so farAlso ReadNavy finds some debris of crashed MiG29K in Arabian sea search on for missing pilotldquoThe Mumbai coast is used by Indian Ocean humpback dolphins Sousa plumbea for biologically important activities Darshan has been observing foraging socialising and mating in the area he observes It is possible that their early arrival is related to oceanographic characteristics currents productivity and prey availabilityrdquo said Dr Dipani Sutaria senior research fellow who has undertaken extensive research in cetaceans whales dolphins and porpoises along the west coast of IndiaDr Baban Ingole visiting scientist National Centre for Polar and Ocean Research under the Ministry of Earth Sciences and former chief scientist National Institute of Oceanography said ldquoSince these are observations over four years I certainly support it and this may be happening across other areas along the west coast too but we must understand the specific reason why this might be happeningrdquoIngole explained that from April onwards till early November fishing activities had been at its lowest due to the Covid19 pandemic and associated lockdown followed by the southwest monsoon when the annual fishing ban is in place ldquo2020 was lean for fishing in at least over 1015 years There is enough evidence to suggest prey must be abundantly available along the coast This means dolphins and other predators had enough food as compared to previous years However we must assess it now as the fishing activity picks up Thus we could expect more such sightings along the west coastrdquo said IngoleThe state fisheries department said fishing was practically zero during the lockdown followed by the monsoon From August onwards to the first week of November it was just about 10 of what it is annually during this period ldquoThis was because a large number of workers that generally come from Ratnagiri as crew avoided coming to Mumbai due to the pandemic They arrived post Diwali and since then fishing activities have been about 4045rdquo said Rajendra Jadhav joint commissioner Maharashtra fisheries departmentProtected under Schedule I of the Wildlife Protection Act 1972 and listed by the International Union for Conservation of Nature as vulnerable the Indian Ocean humpback dolphins have sporadic distribution and are found in localised areas mainly in shallow waters very close to the shore less than 20m deep less than 15km from the shore and around river mouths or estuaries according to the Marine Mammal Research and Conservation Network of India This dolphin species primarily feeds on fish such as mackerel mullet sardines and pomfretldquoSince this is identified on the basis of live examples it is an interesting identification It could be due to changes in ocean currents which carry their feed material in plenty and also may be favourable for their movement at the moment Also the Covid19 associated lockdown may have improved water quality closer to the coastrdquo said E Vivekanandan emeritus scientist at the Central Marine Fisheries Research InstituteVivekanandan however warned that with an increase in infrastructure projects planned along the Mumbai coast there was an immediate need for population estimation of the marine species ldquoIt will help strengthen conservation measures and provide crucial information about the speciesrdquo he saidThe state mangrove cell said they were focusing on the occurrence and genetic studies related to Indian Ocean humpback dolphins along with all coastal districts of Maharashtra including Mumbai ldquoThis has been proposed under our action plan for oceanic dolphin conservation under the Centrersquos Project Dolphin program which has been submitted to the state chief wildlife warden for approval We hope such studies will help improve the understanding of this speciesrdquo said Virendra Tiwari additional principal chief conservator of forest Mangrove CellCatch up on all the latest Mumbai news crime news current affairs and a complete guide from food to things to do and events across Mumbai Also download the new midday Android and iOS apps to get latest updates MidDay is now on Telegram Click here to join our channel middayinfomedialtd and stay updated with the latest news