Mashinga depends on the lake for her livelihood by selling waterchestnuts and fishes she gets from it. Seeing the decline of fishes and the quality of the lake, she worries about the future of the region and its people. Photo by Kartik Chandramouli/Mongabay.

Off the menu

Pengba, a minor carp, is the state fish of Manipur and is reported to be “regionally extinct in the wild” due to obstruction of its migratory route from Myanmar on account of the Ithai barrage constructed three decades ago, said ZSI scientist Laishram Kosygin.

It is now mainly sourced from fish farms and is a prized delicacy both for its protein as well as for the price it fetches. In festive seasons, it can sell for as much as Rs. 800 per kg.

“During our grandparents’ and our parents’ time they did fishing in more traditional ways. Now it takes a lot more effort to catch a about a kilogram of fish through traditional gears in contrast to the period before the barrage. The effort does not translate in economic gains,” said Singh in the presence of his parents and siblings who have branched out to different professions.

They still fish but the condition of the Loktak Lake has rendered traditional fishery techniques economically infeasible, said Singh and members of his community.

Kosygin observed that before 1950s the lake, a breeding ground of indigenous fish, contributed 60 percent of the total fish production of the state of which migratory fish from Chindwin-Irrawaddy system formed 40 percent of the capture fisheries. In 2004, the lake was reported to fetch the state only about 11 percent of fish.

Traditional fishing techniques don’t give enough yield since it’s time consuming and the number of fishes is low too. Exploitative and illegal fishing techniques such as poisoning and LED illumination used by some fishermen have severely damaged the biodiversity of the lake. Photo by Kartik Chandramouli/Mongabay.

Fish diversity and yield plummeted in the last two to three decades, Kosygin said, following construction of the Ithai barrage across the Manipur River. According to Amarjit Singh, the constant high water level maintained in the lake for the functioning of the dam destroyed the breeding habitats.

“They (fish) prefer shallow areas for breeding. In addition, the run-off from chemical fertilisers used in agriculture also directly affects the biodiversity of the lake,” Singh said.

Before construction of the barrage, minor carps such as Labeo angara, L. bata, L. dero besides Pengba used to migrate from Chindwin-Irrawaddy river system of Myanmar to Manipur River and Loktak Lake upstream for breeding and spawning, said Kosygin.

“Their fingerlings migrated downstream with the onset of monsoon. Construction of hydraulic structures, particularly, the Ithai barrage blocked the migratory pathways of these riverine fish species. These fishes have already disappeared from the lake ecosystem,” Kosygin told Mongabay India.

The Ithai barrage has resulted in permanent flooding of the lake and also blocked the migration routes of various fish species, hindering their life cycles. Photo by Rajiv Kangabam.

In addition, as pollution poisoned the lake, it became tough for the native species to survive.

However, hardy Indian Major Carps (such as rohu, catla) and exotic species (grass carp), which were introduced into the lake, were able to brave and thrive.

“The fishery department of Manipur introduced Indian Major Carps along with common carps in the Loktak Lake in the 1960s. Although, there is no report on the formal introduction of exotic fish like Ctenopharyngodon idella, Hypophthalmicthys molitrix, Oreochromis mossambica in the Loktak Lake, they entered the lake through peripheral fish culture farms,” Kosygin added.

Veteran researcher Waikhom Vishwanath of Manipur University noted that the introduced fish varieties are also prolific breeders, expanding their population significantly while the population of native fish was not able to compete with the new arrivals.

“Such is the condition that native species are fighting a losing battle in their own habitat, and now the lake is dominated by the exotic carps,” Kosygin lamented.

Video by Kartik Chandramouli/Mongabay.

Hopes float in hills

Manipur consumes around 52,000 metric tonnes of fish a year and produces 32,000 metric tonnes. To bridge the supply demand gap, Manipur depends on fish brought in from other states of India.

“As the native fish declined in numbers, traditional traps became obsolete. To ensure adequate catch, fisherfolk resorted to unscientific methods such chemical poisoning and LED illumination,” said Amarjit Singh.

LED illumination messes up the lifecycle of fish. The time required for their resting and feeding, changes, said Waikhom. “It really disturbs their day-night cycle, they mature early in more light and the eggs they bear will be less in numbers,” he said.

“So if you want to revive those old techniques then there should be proper water level and it should be replenished by the freshwater from rivers during the rainy season, then water quality will improve and population of native fish will also go up but that is not happening,” said Waikhom.

In 2011 International Union for Conservation of Nature (IUCN) listed 15 fish species from eastern Himalayas, including seven from Manipur as “endangered freshwater fish species”.

Indigenous fishes which formed an important part of the diet and cultural practices have dwindled. They have been replaced by foreign and invasive species. Photo by Kartik Chandramouli/Mongabay.

However, there is hope, believe Waikhom and fellow Manipur University researcher Rameshwori Devi.

“There are more than 200 indigenous varieties and we are updating the list with discovery of new species. We are also looking at hill streams. More of them (indigenous species) are adapted to hill streams so even if Loktak Lake is deteriorating due to pollution and water flow changes, in hill streams they are present,” Waikhom said.

The researchers have urged the state government for the exploration of indigenous varieties, their conservation and if possible, exploitation in a sustainable manner using laboratory breeding techniques.

“There is legislation on paper  (Manipur Fisheries Act 1988) but to implement them in hill areas is difficult. Some villages are much aware of the problem of loss of diversity and they have started certain restrictions in fishing in collaboration with NGOs,” Waikhom said.

On the agenda is conservation of habitats. “There are few species that will survive and breed only in pebbles and sands. But sands are being mined out for construction and their feeding and breeding habitats are being destroyed. So there needs to be restriction to preserve these breeding grounds,” he said.

Since most of the food fish are also ornamental in nature, Rameshori stressed on the necessity to clamp down on trafficking.

“Most of the food fish in their juvenile stages have ornamental value. The Chocolate Mahseer (Neolissochilus hexagonolepis) and our state fish, for example, are quite popular aquarium fish. The problem begins when people capture them from wild. Captive breeding can be sustainably used. DNA barcoding can help in identification and control of trafficking,” she said.

The fish production from Loktak lake dropped from 60% in the 1950s to 11% in 2004. Numerous native fish species have either gone extinct or have become endangered. But scientists believe that conserving the hill stream habitats can save the indigenous fishes of Manipur from going extinct

However, Mashinga has different concerns.

“Youth is no longer interested in traditional vocations, they have aspirations and environmental changes have driven them to pursue different fields. Who will look after our water bodies,” lamented Mashinga as she laid out batches of fermented fish for potential customers.

Article published by Sahana
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