AYIRAI

The Indian Spiny Loach (Lepidocephalichthys thermalis) is a small, freshwater, bottom-dwelling fish found in India and Sri Lanka, commonly inhabiting shallow, sandy streams and paddy fields. Known for being an edible, nutritious, and popular ornamental fish, they have a slender body, reach about 8–12 cm, and are ideal for aquaculture due to low maintenance requirements. 

stm.bookpi.org

stm.bookpi.org

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Key Aspects of the Indian Spiny Loach:

Habitat: Commonly found in quiet, flowing waters, including ponds, streams, and paddy fields in South India (Kerala, Tamil Nadu, Andhra Pradesh).

Physical Characteristics: Small, long-bodied fish (approx. 7-12 cm), with yellow-brown coloring, pale underbelly, and six barbels around the mouth. They have a two-pointed, painful, spike under their eyes.

Aquaculture & Diet: They are considered highly suitable for farming due to their ability to thrive in low-water conditions and high nutritional value. As omnivores, they consume organic detritus and small algae.

Aquarium Care: Require a minimum tank size of 95 Liters (25 US G), with a sandy substrate, pH 6.5 - 7.0, and temperature 22–24 °C (71.6-75.2°F). They are generally peaceful but uncommon in the hobby.

Nutritional Value: They are rich in protein, minerals (calcium, iron, phosphorus), and beneficial fatty acids (EPA + DHA). 

National Institutes of Health (NIH) | (.gov)

National Institutes of Health (NIH) | (.gov)

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Reproduction & Identification

Breeding: They are asynchronous breeders with high fecundity (2,000–5,000 eggs).

Sexual Dimorphism: Females are generally larger and broader with a more prominent abdomen, while males are smaller, more pigmented, and have a thicker pectoral fin base. 

Biotica Publications

Biotica Publications

The species is a sustainable aquaculture candidate, often cultured in, for example, 700-liter poly-lined tanks with high-density, short-duration cycles. 

Network of Aquaculture Centres in Asia-Pacific

Network of Aquaculture Centres in Asia-Pacific

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Dispersal

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It is probable that dispersal of Tarebia granifera from one waterbody or river catchment to another occurs passively via birds, notably waterfowl, which eat them and void them later, perhaps in another habitat.^[1] Evidence for this comes from the finding of many small Tarebia granifera 5–7 mm in height and still containing the soft parts in unidentified bird droppings from the bank of the Mhlali River, South Africa.^[1] Even though the shell of Tarebia granifera is thick, most of these juveniles had been partially crushed with only a few still intact.^[1] Both the intact and damaged specimens could have been alive when passed and perhaps survived had they been deposited in water.^[1] None was large enough to have been reproductively mature (see below) and would have needed to survive in any new habitat for several months before reproducing.^[1]

Passive dispersal may also occur via weed on boats and boat trailers and via water pumped from one waterbody to another for industrial and irrigation purposes.^[1] In the Nseleni River juvenile Tarebia granifera were commonly found with another invasive snail, Pseudosuccinea columella, on floating clumps of water hyacinth Eichhornia crassipes which provide a vehicle for rapid downstream dispersal.^[1]

Once established in a particular waterbody Tarebia granifera is likely to disperse actively, both up and downstream in the case of flowing systems, as far as environmental factors like current speed and food availability will allow.^[1] The snail's tolerance of turbulent, flowing water was demonstrated by Prentice (1983)^[16] who reported it migrating upstream on the Caribbean island of Saint Lucia at a rate of 100 m month⁻¹ in streams discharging up to 50 L.s⁻¹.^[1] In KwaZulu-Natal it has been collected in water flowing at up to 1.2 m.s⁻¹ which is likely to exceed the current speeds of at least the lower and middle reaches of many rivers and streams in South Africa making these watercourses open to colonization.^[1]

The sole of Tarebia granifera is proportionally small when compared to other thiarids and smaller snails with their higher coefficients were less able to grip the substratum in the face of moving water and so did not disperse as effectively as larger ones.^[1]

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