Freshwater Fish Current Affairs - 2020

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Maharashtra Government orders to destroy “Thai Mangur” fish breeding centres

On February 21, 2020, the Maharashtra Government ordered to destroy the Thai Mangur fish breeding centres. This is mainly because the fish is cultivated in unhygienic conditions.

Highlights

The fish whose breeding is to be stopped in Maharashtra is commonly called Thai Mangur or foreign Mangur or African Mangur. As they are being cultivated in unhygienic conditions and have enough potential to make people sick, their breeding centres are being destroyed.

The National Green Tribunal in 2000 banned the cultivation of the Thai Mangur. So far, the State Government has destroyed 32 tonnes of Thai Mangur

Thai Mangur

The Mangur Fish was banned in India as the fish poses threats to other fishes in an ecosystem. A study in Mumbai says hat the Mangur fish is responsible for 70% decline in native fish species of the country

Why so Popular?

In spite of several drawbacks, cultivation of Mangur and their sales is popular for its surviving capabilities. The fish grows 3 feet to 5 feet. They can survive even in mud waters between rains. Other factors such as omnivorous diet, burrowing capabilities, ability to survive on land and ability to hide in vegetation make the species easy and economical for farming.

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Two new species of Freshwater Fish found

Scientists of Zoological Survey of India (ZSI) have discovered 2 new species of freshwater fish from north-eastern and northern parts of country. Both fish are hill stream fauna, measures less than 7 centimetres (cm) and are equipped with special morphological features to suit rapid water flow.

Key Findings

Both species of fish were discovered from remote areas of country. As Glyptothorax gopii was discovered from Mizoram’s Champai district near India-Myanmar border and Garra simbalbaraensis has been found from Himachal Pradesh’s Sirmour district.

As per the experts, origin or evolution of fishes in Himalayas and north-eastern parts of India is probably the consequence or after-effects of orogenic events or geological movement at various stages in Himalayas’ uplift.

Glyptothorax gopii

It is a new species of catfish found in Kaladan river of Mizoram.

Features: It measures 63 mm standard length without caudal fin (tail fin). It is dark brown on its dorsal surface and its ventral (pelvic) surface is of a yellowish-light brown.

It has been named to celebrate contribution of eminent taxonomist K.C. Gopi.

What makes it distinct from other species of genus Glyptothorax? It has an axe-shaped anterior nuchal plate (bone below dorsal fin) which is unique to it.

The elliptical thoracic adhesive apparatus and plicae (folds of tissue) present on ventral surfaces of pectoral-fin spine help fish cling to rocks.

Garra simbalbaraensis:

It was found in Simbalbara river of Himachal Pradesh.

Features: It measures 69 mm standard length without caudal fin (tail fin) and has a yellowish-grey colour fading ventrally (towards lower surface).

It takes its name from Simbalbara river.

It has a prominent unilobed and rounded proboscis with tubercles that help fish in manoeuvrability (movement or series of moves requiring skill and care).

Species of genus Gara has an evolved disc to attach to rocky surfaces.

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