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Glossolepis incisus Salmon Red Rainbowfish

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Description

Glossolepis incisus Salmon Red RainbowfishWeber, 1908 Salmon Red Rainbowfish Species Summary Female Glossolepis incisus have a yellowish olive body colour with a golden iridescence to the scales, and clear fins. The males on the other hand are brilliant, the entire body and fins are a bright salmon red colour. Some of the scales have a silvery sheen, which creates a most unusual effect over the red background colour. Young fish are all rather dull in colour, being an overall olive greenish

Weber, 1908
Salmon-Red Rainbowfish

 

Species Summary
Female Glossolepis incisus have a yellowish olive body colour with a golden iridescence to the scales, and clear fins. The males on the other hand are brilliant, the entire body and fins are a bright salmon-red colour. Some of the scales have a silvery sheen, which creates a most unusual effect over the red background colour. Young fish are all rather dull in colour, being an overall olive greenish colour with a trace of silvery sheen. However, once the fish reach a length of 4 to 5 cm the males begin to colour up. Once the colour change begins to occur it progresses quite rapidly. By the time the fish are 7 to 8 cm long the males should have their full intense red colouration. Males are typically deeper bodied than females and have a high rounded back which gives them the appearance of having a relatively small head and disproportionately large eyes. Males may reach a maximum size of 15 cm, but females are usually less than 12 cm.

Glossolepis differ from other melanotaeniids by a combination of characters which includes distinctly crenulate scale margins, a high gill raker count, spine at the beginning of the second dorsal fin taller than first spine of first dorsal fin, relatively elongate pectoral fins, a unique premaxillary dentition and characteristic profile of the head, nape, and dorsal and anal fins.


Lake Sentani - photo© Gary Lange


Distribution & Habitat
Glossolepis incisus are found only in Lake Sentani. Lake Sentani is located some 10 kilometres west of Jayapura at the NE extremity of West Papua. It is an irregularly shaped lake with approximate dimensions of 28 km (E-W) by 19 km (N-S) and a surface area of 104 km². Its blue-green waters are dotted with at least 16 small islands, and it is surrounded by hillsides in the south and the Cyclops Mountains in the north, which separate the lake from the Pacific Ocean. Lake Sentani is by far the largest of the West Papuan lakes and has a catchment area of about 600 km². About 35 small rivers flow into the lake, and there is one natural outlet in the south-eastern tip, via the Jafuri and Tami rivers to the Pacific Ocean near the Papua New Guinea border. The lake is divided into three main sections with recorded depths of 7 to 52 metres. According to surveys in 1970-71, 1984 and 1987 the lake is thermally unstratified, with surface temperatures of 29-32°C and pH 6.2-6.8. Rainbowfishes are generally found around the margins of the lake. Large numbers are found congregating around submerged aquatic vegetation, fallen tree branches etc.

The overall abundance of Glossolepis incisus was considered high in Lake Sentani during surveys in November-December 2009, July-November 2010 and October 2011, with more than 30 individuals per site per visit, collected during a three-year survey (Ohee 2013). The highest abundance was found at water depths of 0-60 cm and in the early morning, 06.00-09.00 am, and afternoon, around 16.00-18.00 pm. Some fish were also detected at around a depth of two meters, as well as some at depths exceeding two meters. Local spearfishermen reported seeing Glossolepis incisus in even deeper water, while seine fishermen were observed catching them. However, the low number of individuals found in both cases suggests that although they can be found in such deep water, the occurrence is rare. Fish were collected along the shoreline of the lake and mouths of two creeks, namely Waena Creek and Jembatan II Creek. Fish with smaller body lengths (<90 mm SL) tended to occupy the very shallow area near the shoreline, while fish with larger bodies (>90 mm SL) were rare along the shoreline. The mean body lengths (SL) of the collected specimens were 65.52-70.72 mm.


Glossolepis incisus (males) - photo© Hristo Hristov


Male Glossolepis incisus were more abundant than females in the shallow waters along the shoreline, the latter being found more commonly in deeper waters. Moreover, they usually avoided high light intensities by moving to shaded areas or deeper water. Therefore, fish were rarely found in shallow waters during periods of high light intensity, such as from late-morning to mid-afternoon, having moved to deeper waters. In cases where they remained near the surface, they had moved to shadowed areas, such as under stilt houses or amongst submerged plants. The substrate of the lake consists of mud and sand, and water plants grow in shallow areas to cover 25% of the lake's area.

Glossolepis incisus are known to prefer habitats with submerged plants, roots, and wood debris, which are all commonly found along the shorelines. In Lake Sentani, various types of terrestrial vegetation were also found along the shoreline. The vegetation grows naturally, or is planted by people who reside in the area. Generally, the fish were abundant amongst the roots of some plants, such as the Sago Palm (Metroxylon sagu), or large trees, such as Ficus spp., as well as grasses. Large trees also provided shade for the fish. Hydrilla verticillata was the most ubiquitous water plant, being found in most locations. Hydrilla verticillata, Ceratophyllum demersum, Myriophyllum, Potamogeton and Vallisneria are some aquatic plants found in the deeper parts of the lake, while water lilies (Nymphaea, Nymphoides), Ipomoea aquatica, Bulrushes, and floating aquatic plants Eichhornia crassipes, Salvinia molesta and Lemna are found in the shallow parts. Eichhornia crassipes is the most common plant and is found throughout the entirety of Lake Sentani, often disturbing water-based transportation. Pandanus and Sago (Metroxylon sagu) grow on the shore.

The overall habitat preference of Glossolepis incisus was clear, shallow water, sand, gravel, and cobble substrate, and shoaling amidst Hydrilla verticillata, Valisneria, Eichhornia crassipes, Metroxylon sagu, and grasses. The availability of food also attracted fish to certain areas, such as under the traditional stilt houses, roots of some plants, litter, and wood debris. The pollen of terrestrial plants, as well as terrestrial insects, also served as a food source for the fish, along with the larvae of aquatic insects and algae. Roots of plants were also important for refuge. These factors influenced their distribution and habitat selection, and consequently, its abundance (Ohee 2013).

Unfortunately, because of its proximity to the provincial capital Jayapura and the large population around it, Sentani is no longer the pristine lake it once was. Despite the fact that Lake Sentani has been identified as an important ecosystem for species conservation (Conservation International 1999; Polhemus et al. 2004), the area remains under no protection. Meanwhile, human activities surrounding the lake have led to noticeable deforestation around it, water pollution, and the introduction of exotic species. Although Glossolepis incisus has been largely unaffected by the present concentrations of pollutants in Lake Sentani, the continuing human population growth around the lake will result in concentrations that will be hazardous to Glossolepis incisus and its co-inhabitants.

Reference

https://rainbowfish.angfaqld.org.au/Incisus.htm

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Z. Ed
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Finally, a dress shoe that actually feels like a sneaker!
Size: 8.5, Color: Dark Brown
I was honestly super skeptical about buying shoes on Amazon, especially "dress sneakers." Usually, they either look incredibly cheap in person or they completely destroy your heels within an hour. I am so glad I took a chance on these Bruno Marcs. I commute to campus and take the bus almost every day, so I end up doing a ton of walking. I needed something that looked sharp and put-together, but I absolutely refused to sacrifice comfort for a long day on my feet. These completely hit the mark. Right out of the box, there was zero break-in period—no stiffness, no pinching, and no blisters. They are incredibly lightweight, and the material actually looks premium, not like that shiny, fake plastic you sometimes get at this price point. The traction on the bottom is surprisingly good too, which is a lifesaver when I'm rushing to catch my bus on rainy mornings. If you’re on the fence, just get them. It’s rare to find a shoe that balances looking professional with feeling exactly like your favorite weekend sneaker. Easily one of the best wardrobe purchases I've made in a while!
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Milagros Ramos
Bozeman, US
★★★★★ 4
High quality, perfect color and very nice price!
Size: 14, Color: Brown, Size: 14, Color: Brown
I bought this shoes for my husband's Christmas present, so he didn't try yet. So far, the color is perfect! I feel like he can wear this shoes with different outfits, for the price it seems hight quality, it is not heavy at all. The shoe features a soft, comfortable lining and the sole is perfect because it is non-slip.
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Reviewed in the United States on December 4, 2025
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effie
Waukegan, US
★★★★★ 5
Squeaky
Size: 8, Color: Black
They look incredible. But they're a little squeaky. Otherwise my husband loves the comfort. They go with any outfit
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Reviewed in the United States on May 11, 2026
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Boito
Omaha, US
★★★★★ 5
These fit very nicely, are comfortable, and work for my wide feet!
Size: 12 Wide, Color: Brown
Once I learned while shoe shopping in my youth that I needed wide-sized shoes, I wasn't able to easily choose from any shoes I saw in the store. I usually have to go find the wide widths and have to deal with the limited styles they have. Shopping online has been hit and miss, too. Sometimes, shoes are advertised as wide width, but end up still being too narrow. These shoes fit me just right. They were not too tight at the toes, gave good width at the arch, and the opening was large enough that I didn't have to undo every single lace just to get my foot in. They also look nice, and I'm sure will take a decent polish. Also, note that this does say it's an Oxford shoe, but it does have the open lacing and is more of a derby-style shoe. This also helps with sizing for my wide feet. If I didn't already have a pair of black shoes, I'd look at picking one of these up. My only reservation with these is that the soles are not dark-colored to complement a more formal style. I feel the white makes them a little more casual. The sole is also more transparent/opaque coloring at the heel and underneath, which you can kind of see-through, so keep that in mind. It's not fully clear, but is kind of transparent, which I was not expecting. I think it also shows where it picks up dirt as you wear it. Just more of a style cue one way or another. As a reference, I buy the 4E wide and Extra Wides in New Balance and Skechers. I also have a hard time getting any good fit in Nike shoes.
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Michelle sealock
Louisville, US
★★★★★ 5
Looks and feel good
Size: 10.5, Color: Black
Shoes look dressy but feel comfortable. They are stiff but very comfortable.
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Reviewed in the United States on June 8, 2026

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