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Burmese Rummynose Tetra 2cm (Sawbwa Resplendens)

Sawbwa Resplendens
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Family: Cyprinidae

Endemic to the isolated mountain lake of Inle and associated watershed in Shan State, eastern Myanmar. Type locality is ‘Inle Lake, Southern Shan States, Myanmar’. 

Lake Inle lies in a karstic valley almost 900m above sea level in the Shan Plateau region and is home to many endemic animals including nine species of fish and numerous gastropods. The water is clear, shallow (2-3 metres deep in most places) and has a very fertile, loamy substrate, although it can be muddy and turbid around the margins.  It is famed for its stilted villages and local fishermen known as Intha who row their boats using only one leg. These people, thought to have migrated from the south of Myanmar in the late 1300s, use naturally-occurring floating ‘islands’ consisting of tangles of various plant species as gardens. These islands form a wide raft around the lake margins, rising and falling with the water level, and have come to form the habitats of many fishes which take shelter among the tangle of roots and plant stems at their base. Macrophytes also grow densely in places. S. resplendens occurs throughout the lake, in both clear and turbid water, but is mostly collected around the vegetated margins.

Maximum Standard Length:
25 – 35 mm.

Aquarium Size:
An aquarium measuring 60 x 30 cm or larger should be the smallest considered. It is advised to find a filter which has a water flow between 4-5 times the volume of your aquarium. 

Perhaps most suited to a heavily-planted set-up, preferably with a dark substrate. The broken lines of sight that exist in such a display allow it to display natural behaviour as well as helping to reduce skittishness. Floating plants are a useful addition, and water flow should not be too strong.

Water Conditions:
18 – 22 °C
pH: 6.0 – 8.0
Hardness: 54 – 268 ppm

Likely to feed chiefly on small invertebrates and other zooplankton in nature. In the aquarium it will accept dried foods of a suitable size but should be offered regular meals of small live and frozen fare such as Daphnia, Artemia and suchlike.

Behaviour and Compatibility:
Peaceful towards other species but not an ideal choice for the general community aquarium due to its small size and aggressive interactions between rival males. It does best when maintained alone or with similarly-sized, active species that enjoy comparable water conditions. Though gregarious by nature it exhibits shoaling rather than schooling behaviour. Males tend to be engaged in a continual battle for dominance, particularly when maintained in small numbers or in the presence of few females. The best way to minimise this behaviour is to purchase more females than males; a ratio of 4:1 or more being ideal. Unfortunately females can be hard to find on sale because exporters often prefer to ship only the more colourful males. At the very least try to purchase sexed pairs or use a larger tank arranged in such a way that many broken lines of sight are provided.

Sexual Dimorphism:
Can be sexed by colour pattern. In males much of the head and caudal-fin lobes are red, and the flanks have a bluish sheen. Females are uniformly olive to pale brown with the exception of a dark marking anterior to the anal-fin.

Naturally deposits eggs among aquatic vegetation, filamentous algae, or on the underside of broad leaves, but in the aquarium synthetic spawning mops can also be used if you prefer. Apparently the most favourable results are obtained when a group of adults is maintained together as a group and the plants or spawning medium checked for eggs on a daily basis. Temperature also appears important, with the fish failing to spawn at values in excess of 25°C, while general hardness should be at least 20° for both successful spawning and rearing of fry. SF member Mike Vulis notes that although the fry are relatively large they require microscopic food for at least 5-6 days before they will accept larger fare such as Artemia nauplii, apparently because they are only capable of digesting quite small amounts of food at a time. Small meals offered several times a day are therefore recommended for optimal growth, and it is important to observe the fry closely as they absorb their yolk sacs since they require food almost immediately once free-swimming.