Fish Guide

Roseline Shark (Denison Barb): Care, Feeding, Tank Setup And More

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Roseline Sharks are quite unique fish to add to the tank. If you are looking for a fish that will boost up the aquarium’s beauty and make it one of a kind at the same time, you are definitely looking for Roseline Sharks.

In straightforward words, it is not challenging to care for a Roseline Shark. Caring for the Roseline Shark includes a healthy diet, preventing some dreadful diseases, maintaining correct aquarium temperature, filtration, and many more. Every small detail must not be taken for granted. 

Roseline Sharks are amazing creatures that make your aquarium look lively and attractive. Before getting into the details about its care, let me begin with a short description of this handsome creature. By the end of this article, you will surely have the basic knowledge of how to care for the Roseline Sharks in your aquarium,

Overview Of Roseline Sharks

Denison Barbs (otherwise known as Roseline Sharks), Miss Kerala, or red-line torpedo barb, is an excellent and dynamic freshwater fish that makes an incredible expansion to pretty much any tank. I previously encountered this species a year back and have been a huge fan from that point onward!

I agree with the fact that the Roseline shark is a rather unusual but unique addition to your tank. So, in case you are searching for an excellent showcase shading in your home aquarium, the Denison Barb (logical name: Sahyadria denisonii) is a freshwater animal variety worth looking at.


The consideration of the necessities of Roseline Shark is pretty clear. These barbs look incredible, and they are likewise amusing to watch. This is the reason I praise them enthusiastically to different aquarists constantly.

You can expect these barbs to get twisted up and be more aggressive towards one another around sunset and first light.

Even though they can grow up to 5.9 inches (15 cm), they normally do not get bigger than 4.3 inches (11 cm).

Roseline Shark is torpedo-shaped and is quite colorful when the aquarium is well lighted. You can see different colors like black, red, and silver running through its body with a base color of silver.

Physical Features

Color Form Black, Red, White
Care Form Easy
Lifespan 8 years
Family Cyprinidae
Sub Family Sahyadri
Phylum Chordata

Habitat Of Roseline Shark

The Roseline Shark turned into an instant classic in the aquarium world from the mid of 1990s.

The species was at first gathered vigorously from its local living space, the precipitous upland surges of Southwestern India. Thus, this inevitably offered a route for Roseline Sharks to step up in the fishkeeping world.

Where Can I Mostly Find Roseline Shark?

Denison’s spikes are native to Kerala and Karnataka in southern India. The population of Roseline Sharks is greatly divided into the area you are conscious of, the area like Valapattanam, Chaliyar, Kallar, Karyangod, Chandragiri, Kuppam, Iritti, Anjarakandy Puzha, Bhavani, and Bharathapuzha stream. Majorly, Roseline is found in the West Ghats Of India.

How To Determine Gender Of Roseline Shark?

There is barely any unmistakable difference between the genders. As a keeper, you should know the sex contrasts among the fish in your aquarium.

On that note, you should realize that there is no unique contrast between the male and female of this species. It is quite difficult to find out the difference between the two.

Nonetheless, when these fish achieve sexual development, there is a thumb rule to tell the female from the male.

Nature Of Female Roseline

Female Roseline grows somewhat bigger and is heavier-bodied. Similarly, you will view that, at times females are less brilliantly shaded. Additionally, females will build up a more adjusted body.

Nature Of Male Roseline

Males tend to be scarlet red. Likewise, males keep up a thin and all around formed body structure.

How To Care For Roseline Sharks?

A good aquarist knows that an appropriately maintained aquarium can be amazing. However, if not looked after appropriately then, you will end up with a dead fish and a terrible tank. Most common beginner aquarium mistakes can cause this.

It is very important to know what type of tank and what quality of water is best when you pet a Roseline Shark. To maintain a good environment inside the tank, you should carefully choose the precise tank size, shape, and right condition of water, which will be best for Roseline Sharks to flourish.

Tank Size

If you are interested in petting Roseline Sharks, then it is important to keep in mind what type of tank is suitable.

Max Size of Fish 5 to 6 inches
Size of Tank Required 55 gallons or more

Like most spikes, these folks are incredible hoppers, so you will require a cover. Why Do I Need A Lid For My Fish Tank? Here Are My 5 Reasons.

Tank Temperature

When it comes to looking after species that grow in water, you must look at the accurate water parameter and temperature of the tank for them.

These barbs can deal with a scope of temperatures and water conditions – from stale to quicker stream, making them a flexible network fish. The temperature that it does well in is 65 F to 79 F (18 C to 26 C).

Maintainance Of Water Quality

Roseline sharks are not tolerant of any poisons (most common being ammonia poisoning), so you have to care about the tank water and ensure you have an all-around cycled channel.

Water Changes

Depending on your tank size and how supplied your aquarium is, you may have the option to do 25% water changes each other week.

Obviously, when we are discussing 55+ gallon aquariums, that is a ton of water each week and unquestionably a lot for the normal individual. So, check out our method of changing water safely.

Water Testing

I energetically suggest getting a dependable and accurate water test unit to screen these boundaries consistently. In case you are not getting the correct data from your test pack, it can make you roll out superfluous improvements to the water.

Therefore, I highly suggest API FRESHWATER MASTER TEST KIT 800-Test, which is a freshwater aquarium water master test kit. You might be surprised by how much you love it.


You will likewise need a decent de-chlorinator and a small bunch of medications to keep sickness from clearing out the sandbar.

On the off chance that one fish becomes ill and is not dealt with rapidly, there is a decent possibility the majority of your fish will become ill. So, having drugs convenient before you need them can be a lifeline.

Water Parameter

You do not need to be a scientist or scientific expert to be a creative aquarist however, understanding the nuts and bolts of water science, and water quality will assist you with keeping up a sound, inconvenience-free aquarium.

Besides, you shall maintain a ph level of 6.6 to 7.6. Similarly, you need to maintain the hardness of water from 5 to 25 dGH.

Water Chemistry

The aquarium nitrogen cycle is the component by which waste is handled in an aquarium. Freshwater aquarium fish discharge squanders as smelling salts (NH3), which is harmful to all freshwater life forms.

Nitrifying microscopic organisms living in the channel, rock bed, and on strong items in the aquarium convert smelling salts to nitrite (NO2), which is additionally poisonous. Nitrite is then changed over to nitrate (NO3) by an alternate arrangement of nitrifying microscopic organisms.

Nitrates are not harmful to fish as such, however, not when it is present in the long haul. An introduction to significant levels can pressure them, stunt development, harm organic, and make them more powerless to sickness.

Equipment For Roseline Shark Tank

Arranging the stylistic layout is similarly as significant as maintaining the water quality in the aquarium.

Denison Barbs need a characteristic stylistic layout that is suggestive of their common environment. Without it, the fish can get pushed and lose its shading.


Denison thorns love overhead lighting. A good pair of lighting can inflict their colors more brightly. Although most freshwater fish are used to living in blackwater, you must maintain a proper adjustable lighting system for Dension barbs.


Given the suggested size of the tank, Hang On Backs will not be the most ideal alternative to turn over your tank. So, I would prescribe canister channels to take care of the business.

You will need to glance someplace in the scope of 4x to 6x turnover every hour. To discover the GPH, you will require, duplicate the size of your tank by the turnover.

I would likewise recommend searching for something flexible, so you can undoubtedly scale up or down the stream to whatever makes your spikes are most joyful. Penn Plax Cascade CCF3UL Canister Filter will be best for large aquariums and fish tanks up to 100 gallons.

Ornamentation (Decoration) Of Tank

A tank without enough stylistic decoration can make your brilliantly shaded pet shark look somewhat pale. Likewise, a firmly fitting tank cover is best. Obviously, your pet fish is extremely dynamic and quick. Thus, it can leap out of the tank without any problem.


Beginning at the lower part of the tank, apply a layer of sand or fine rock. You can add a few rocks and stones to the substrate for a more normal look. At that point, add a few plants. You can pick plants like Anubias, Java Fern, and whatever else that adds some vegetation to the climate. Simply ensure that everything is moored in pleasantly.

Also, keep in mind to keep away from anything sharp – however, waterway stones, HTH pool channel sand will function admirably for these folks.

Finest Shrubs For Roseline

The less Roseline sharks you have in your tank, the more plants you will need to ensure they have. This gives the barbs a sense of security and has a departure course from hostility.

You will need to search for plants that can manage a moderate stream rate and are sufficiently tall to give great coverage. However, also fond one that will not take up a huge load of swimming space.

In case you are having issues with your spikes being especially jittery, you can attempt to put in some floating plants.

What Are The Suitable Plants For Roseline Sharks?

Here are some suitable plants for your Roseline Sharks:


Vallisneria is a lowered plant that spreads by sprinters here and there but structures tall submerged glades. Leaves emerge in groups from their underlying foundations.

Moreover, the leaves have adjusted tips and distinct raised veins. Likewise, single white female blossoms develop to the water surface on extremely long stalks.

Additionally, male blossoms develop on short stalks, get disconnected, and buoy to the surface. The natural product is a banana-like container.

Bacopa sp

Bacopa Sp is a variety of 70 to 100 oceanic plants having a place with the family Plantaginaceae. It is usually known as water hyssop (or water hyssop).

However, this is all the more deceptive as Bacopa is not firmly identified with hyssop yet essentially has a fairly comparable appearance.


It is an oceanic perpetual herbaceous plant local to North and South America. Similarly, it is a weed of public hugeness in Australia. The most suitable plant for Denison Barb is Cabomba.

Java fern

It is deductively known as Microsorum Pteropus. Java Fern is a work of art and an extremely famous aquarium plant. This sensitive looking greenery adds a wonderful look to aquariums, especially for Roseline sharks.

Feeding Roseline Shark

Roseline sharks are omnivorous and will eat numerous foods. They like to eat their food mid-water or from the lower part of the tank. So, I would avoid anything gliding as it will probably dirty your tank sometime before it gets eaten.

One thing to remember is that even though they are generally huge fish, their mouths are not exactly as extensive as you would expect. You should take care of an assortment of edibles, including substantial nourishments, just as vegetable issues.

List Of Best Food For Roseline Shark

Your Roseline shark will promptly acknowledge Inhabitat nourishments. This can include:

If you decide to keep Roseline shark in your aquarium, guarantee to take care of it with chips rich in carotenoids and astaxanthin. This will allow your shark to recover its hue (color).

This fish species is calm and large in the assessment. Nonetheless, some have demonstrated slightly strong hostility around food. This is generally noticeable in tanks with limited spaces.

List Of Finest Vitamins For Roseline Shark

Here are some finest vitamins for your Roseline Sharks:

  • Vitamin C to advance the bone turn of events, recuperating, and absorption.
  • To help with catalyst, Vitamin B2, and B6.
  • Vitamin B1 to help with the breakdown of sugars.

Note: Mineral savvy requires calcium, phosphorus, and manganese.

List Of Homemade Food Items You Can Feed Roseline Shark

Here are some homemade food items you can feed to your Roseline Sharks:

  • Organs and meat (without any fats)
  • Spinach and lettuce
  • Root vegetables, broccoli, and carrots.
  • Flour and corn (organic product)

How Often And How Much Should You Feed Your Rosline Shark?

All things considered, it is smarter to feed your fish two to three times a day. You should only feed as much as they can eat for 2 minutes.

If you overfeed your fish, you can wind up with an entire host of issues, including changes to the water quality, which thus, influences the fish.

Not only does the left-over food which has gone uneaten begin to spoil in the tank, but the fish that have eaten large amounts of food, additionally, make more waste. Overloading can likewise cause low oxygen levels, blade decay, greasy liver, flatworms, and block waterways. You can always maintain the oxygen level in your aquarium by other means.

Tank Mates For Roseline Shark

Tankmates are essential for the Roseline Sharks like other fish pets. Better tankmates assure better health as well as the long life of the fish. Thus, it is crucial to keep your fish safe. So, understanding which type is a good tank mate or a bad tank mate is necessary.

Good Tank Mates For Roseline Shark

Some of the names of best mates for Roseline Shark are:

  1. Tiger barb
  2. Siamese Algae Eater
  3. Zebrafish
  4. Tetras

Worst Tank Mates For Roseline Shark

Some of the names of mates that are not good for Roseline Shark are:

  1. Discus Fish
  2. Oscar
  3. Angelfish

Breeding And Reproduction Of Roseline Shark

The greater part of the recorded effective rearing of the Roseline sharks occurred in business fish ranches. Thus, the greater part of this fish species marked down originated from a fish ranch. These fish were reproduced through hormonal infusions.

How To Trigger Breeding In A Home Aquarium?

There have been reports of exclusive occurrences of fruitful reproducing of the Denison thorn. Be that as it may, there are still no exact proposals on reproducing this shark species in a home aquarium.

Similarly, the report from Chester Zoo Tank in England recommended that this fish species will require a bigger gathering for production to happen. In return, there would be monstrous generating.

So, the breeding of Roseline Sharks in a home aquarium is quite rare. But, if you really want to breed a Roseline shark, you will have to put in at least 15 of them in the same tank for spawning. Although I will not recommend you try it at home!

Additional Care Technique For Roseline Shark

Roseline Shark needs clean water and a lot of room to ensure that they grow. Keeping up with the correct conditions will forestall pressure and prevent basic fish sickness.

The Roseline do best when they are encircled by companions. They need their group of friends. So, to think about them in the most ideal manner, you must ensure you keep six Roseline sharks altogether.

Keep their water clean to forestall regular fish illnesses. Address your veterinarian to learn exactly how much and how frequently to take care of your pet regarding the diseases.

How To Know If Your Roseline Shark Is Sick?

If you see symptoms like red streaks, popeye, bloating, then it is more likely to be caused by Bacterial Infection because of dirty water inside the tank and due to food that has gone bad.

Similarly, if your pet is floating upside down and standing on its head then, it is more likely to have caught Swim Bladder Disease because of cysts and bacterial infection.

There is a distinction between an enlarged fish and a fish that has eaten excessively. The fish that ate a lot of food will act ordinary while the others typically won’t. Well, bloating is caused by constipation and Intestinal blockage.

What Can You Do To Keep Roseline Shark Away From Disease?

There are certain things that you can do to keep your dear pet away from any kinds of diseases. I have mentioned the ways below:

Clean Water/ Maintain Water Quality

The biggest enemy of Roseline sharks is terrible water. Therefore, clean your tank at least weekly or biweekly and fill up the tank with good quality water. Regardless of whether they have an infection, it presumably originated from terrible water.

Before you attempt to treat the illness, you should treat the source and also feed them right.

Reduce Nitrite (NO2) Levels

Nitrifying microbes living in the aquarium convert smelling salts to nitrite (NO2). An ascent in nitrite generally follows an alkali spike. Nitrite hinders oxygen trade to fishes’ circulation system, consequently making them choke. So, changing the water or even cleaning the tank will help solve this issue.

Test Tap Water Before Using

Nitrite is changed over to nitrate (NO3) by nitrifying microorganisms. While nitrate is far less poisonous to fish and other freshwater creatures than smelling salts and nitrite, it can still stunt your fish’s development.

Besides, long haul introduction to significant levels stresses them and bargains their safety. Nitrate is likewise a significant supporter of green growth development.

Some faucet water sources are high in nitrate. So, it is a smart thought to test your tap water before utilizing it.

Reduce Phosphate (PO4) Levels

Regular hotspots for phosphate in an aquarium are incorporate tap water, fish food, particular kinds of actuated carbon, rotting natural material, and specific sorts of cradles.

Although phosphate is not majorly destructive to fish, it is a significant supporter of green growth sprouts, particularly “green hair growth.”

To keep up low phosphate in an aquarium,

  • do normal incomplete water changes utilizing water without phosphate,
  • feed sparingly utilizing low phosphate-containing nourishments,
  • keep the aquarium liberated from natural trash, and
  • use Kent Marine Reef Carbon
  • use Phosphate Sponge in the channel.

Treating Your Sick Roseline Shark

You can add antibiotics to the water and utilize anti-microbial cured food. However, I suggest that you use these drugs only as a last resort.

Moreover, keep up the great water quality. Try isolating any fish with indications of the sickness. Treat influenced zones with effective disinfectants.

Signs Your Roseline Shark Is Healthy

You can add up a routine check-up for signs of your Roseline Sharks health. If the following things are lacking, your Roseline Shark might be going through problems in the tank.

  • If your fish have clear and bright eyes, then it is definitely the healthy one.
  • Similarly, if your fish have higher activity levels, playing with their mates and swimming throughout the entire tank, then it is sociable and disease-free.
  • A healthy Roseline shark does not have discoloration or scar on its body.
  • The fins are perfectly fine and not ripped. Overall, body parts look normal. You can find the treatment for fin rot disease here.
  • It eats regular varieties of food and swims to the surface during the feeding time.

If it hangs and sticks at only one position of the tank or stays in the bottom of the tank for a long time then, your fish is probably ill.

Frequently Asked Questions

Does Roseline Shark Lose Color?

Yes, Roseline Sharks may lose color when they are pushed to their limits or, on the other hand, if there is an adjustment in the structure of the tank water. Additionally, change in climate, and new tank mates can cause them to lose touch with their brilliant hue.

Obviously, stress from transportation and climate change can cause them to get paler.

Are Roseline Sharks Endangered?

The decrease of the Roseline Sharks is caused by the loss of living space as a consequence of human contamination and deforestation.

The business reproducing programs in Southeast Asia and Eastern Europe may also be the cause for the loss of this aquatic species. It is quite difficult to reproduce the Roseline Sharks unless they are kept in a bunch, which makes it even harder to protect the species.

Are Roseline Sharks Fin Nippers?

No, Roseline sharks are not fin-nippers. The only time you would worry about it is when you keep it with species of similar size or larger. These barbs do best when kept in schools in tanks of at least 55 gallons. 

Last Words

With this information, anybody can undoubtedly keep the fish species, Sahyadria denisonii as an aquarium pet. This freshwater fish is exceptionally quiet inside a tank.

With this article, I hope you came to know a lot about caring ideas for Roseline Shark. Your aquarium will look amazing with the Roseline Sharks. Comment below on your experience with the Roseline Sharks!

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