Glass Perch, Glassfish, Ind (Ambassis lala) — > 2,5cm

Overview

Ambassis lala, commonly known as the Glass Perch, Glassfish, or Indian Glass Perch, is a delicate translucent schooling fish from South Asia that adds shimmer and movement to peaceful planted community aquariums. Available for sale UK through Tropical Fish Co, this fascinating species reaches 3.5cm and displays remarkable transparency allowing observation of internal organs and skeletal structure. The peaceful temperament and moderate care requirements make it suitable for aquarists with calm, well-established aquariums seeking unusual nano fish with engaging schooling behaviour. Native to both freshwater and brackish coastal waters, this species brings unique visual interest whilst requiring thoughtful tankmate selection and appropriate water conditions.

Appearance and Transparency

The Glass Perch displays extraordinary body transparency that gives this species its common name—light passes through the body revealing internal organs, skeletal structure, and even blood flow in larger vessels. The elongated, laterally compressed body shows typical perch-like morphology with two dorsal fins (spiny anterior and soft-rayed posterior sections) and well-developed anal fin. In optimal conditions with proper lighting, subtle golden or greenish iridescence appears along the flanks, whilst the swim bladder appears as a distinctive silvery internal structure. The transparency varies with health and stress levels—healthy relaxed fish display maximum clarity, whilst stressed individuals may appear more opaque or develop stress markings. Eyes are large and prominent, adapted for hunting small prey items. Finnage is delicate and colourless, contributing to the overall ethereal appearance.

Natural Habitat

Ambassis lala inhabits freshwater rivers, streams, ponds, and brackish coastal waters throughout South Asia, particularly India and Bangladesh. These environments range from purely freshwater inland systems to slightly brackish estuarine zones where freshwater meets tidal influence. Water is typically warm year-round with neutral to slightly alkaline pH and variable hardness depending on location. Habitats feature calm to slow-flowing water with abundant aquatic vegetation providing cover and supporting rich populations of small invertebrates and zooplankton—primary food sources. The species forms schools in mid-water zones amongst vegetation, using their transparency as camouflage against predation. Seasonal monsoons bring dramatic changes in water volume and chemistry, though populations adapt to varying conditions.

Aquarium Setup

Provide a minimum 75-litre aquarium allowing space for a proper school of 8-10+ Glass Perch. Use fine sand or smooth gravel substrate with generous planting creating security whilst maintaining open swimming spaces. Dense vegetation along tank perimeters with clear central areas mimics natural habitat structure—use hardy plants such as Java fern, Anubias, Vallisneria, and floating species to diffuse lighting. Subdued to moderate lighting suits their somewhat shy nature and enhances the visual effect of their transparency. Gentle filtration providing minimal current suits their preference for calm waters—these delicate fish struggle in strong flow. Excellent water quality is essential given their sensitivity. A tight-fitting lid prevents jumping, as Glass Perch may leap when startled or during spawning behaviour.

Water Parameters and Quality

Maintain temperatures between 20-30°C—this broad range reflects the species' adaptability across its natural range, though 24-27°C is optimal for routine keeping. Water should be neutral to slightly alkaline with pH 6.0-8.0 and moderate hardness (8-15 dGH). Whilst the species tolerates brackish conditions in nature, most aquarium specimens thrive in purely freshwater systems. Water quality must be excellent: zero ammonia and nitrite, with nitrates maintained below 20ppm through regular 25% weekly water changes. This delicate species is sensitive to declining water quality and dissolved metabolites, showing stress rapidly when conditions deteriorate. Good oxygenation through gentle surface agitation supports their relatively high metabolic rate.

Feeding and Carnivorous Diet

Ambassis lala is a carnivorous micropredator that naturally feeds on small invertebrates, zooplankton, and insect larvae captured from the water column. In captivity, provide varied diet of small live and frozen foods: bloodworms, daphnia, brine shrimp, and chopped insect larvae offered 2-3 times daily. Quality micro pellets and crushed flakes may be accepted once acclimated, though live/frozen foods should form the dietary foundation for optimal health and colour. Food particle size is critical—items must be appropriately small for their delicate mouths. Feed small portions multiple times daily rather than large single feedings, as these fish have small stomachs and feed continuously in nature. Ensure food reaches mid-water zones where Glass Perch forage rather than settling immediately to substrate.

Behaviour and Schooling Dynamics

Glass Perch are highly social schooling fish that must be kept in groups of 8-10+ individuals for psychological wellbeing. Solitary specimens or inadequate group sizes result in chronic stress, hiding behaviour, and eventual decline. In proper schools, they occupy mid-water zones with synchronized movements creating mesmerizing visual displays as light plays through their transparent bodies. Activity levels are moderate—they're not hyperactive dashers but maintain constant gentle movement through planted areas. The species is somewhat shy, particularly when newly introduced, requiring patient acclimation and calm tankmates before displaying confident behaviour. They may startle easily, darting rapidly to cover when surprised—ensure adequate planting to provide security.

Compatible Tank Mates

Select tankmates carefully to match the Glass Perch's delicate peaceful nature. Suitable companions include other small peaceful schooling fish such as small rasboras, peaceful danios, and non-predatory bottom dwellers like small catfish. In larger well-planted aquariums, non-predatory shrimp and snails may coexist successfully. Avoid large aggressive cichlids, fin-nipping barbs, large predatory fish that might view the small Glass Perch as prey, and very boisterous tankmates that would stress these shy fish. Species requiring significantly different water parameters (particularly fish requiring very soft acidic water) should be excluded. Fast aggressive feeders that monopolize food should also be avoided, as shy Glass Perch may not compete successfully.

Breeding

Captive breeding of Ambassis lala is uncommon in home aquaria, with limited documentation of successful spawning. If breeding is attempted, provide quiet well-planted aquarium with fine-leaved plants or spawning media for egg deposition. Condition fish with abundant live foods until females appear noticeably fuller. Spawning may be triggered by slight temperature increase and increased water flow. Eggs and fry are extremely small—fry require infusoria or other microscopic live foods initially, making rearing challenging. Separate breeding tank is essential as adults show no parental care and will consume eggs and fry opportunistically.

Why Buy from Tropical Fish Co

Tropical Fish Co supplies healthy, quarantined Ambassis lala that have been carefully acclimated to UK freshwater conditions and are feeding actively on prepared and live foods. Each Glass Perch is hand-selected for maximum transparency, good body condition, and normal schooling behaviour, ensuring you receive delicate fish ready to thrive in appropriate calm aquariums. Our experienced staff understand the specialized requirements of this unusual species and can provide detailed guidance on suitable tankmates, appropriate school sizes, and dietary needs. With specialist packaging designed for delicate transparent fish and next-day UK delivery, your new Glass Perch arrive safely in peak condition. We're committed to sustainable sourcing and work only with responsible suppliers who prioritize fish welfare and ethical collection practices.