The answer is yes, there are a lot of behavioural and physical effects on all species of fish.

When fish are exposed to too much artificial light, it interferes with all of their physiological and behavioural functions. Light also affects the metabolism of fish.

That’s the quick answer. If you want to learn profoundly about this topic, then make sure you read this article all the way to the end so that you do not miss anything vital.

Now let’s discuss our topic without getting behind schedule.

Are fish affected by light?

The answer is yes, each species of fish is affected by light in both behavioural and physical ways. Overexposure to artificial light interferes with fish’s physiological and behavioural functions

The thing that light affects the most is fish metabolism. The growth and production of eggs may be significantly accelerated by increasing light. In several fish species, the amount and quality of light affect the maturation of the gonads.

It may be difficult for fish to develop properly and their regular metabolism may be affected if they do not receive the necessary amount and intensity of light.

The Question Is, What Are The Effects Of Light On Fish?

Light can have different effects on fish based on their life stage. Sometimes, the light can be a very good thing for them, while other times, it can be aggravating and annoying for them.

It is therefore necessary to look at the different stages of fish life to understand how they are affected by light at each stage.

Effects Of Light On Fish Different Life stages:

Luckily, there has been a lot of research on the effects of light on fish, which shows the following effects on different fish life stages:

Good Effects On Some Fish Reproduction

16 hours of light and 8 hours of darkness benefited the growth and reproduction of cod (Gadus morhua), trout (Oncorhynchus mykiss), sea bream (Sparus aurata), and red snapper.

During this photoperiod, species with better feed visibility have higher feed consumption and feeding efficiency.

Bad Effects On Some Species!

A prolonged light cycle isn’t always the key to successful fish reproduction, especially when it comes to lighting on fish production.
Several aquatic species prefer short light periods, such as turbot (Scophthalmus Maximus), which convert feed more efficiently and yield higher yields under 12:12 and 08:16 light-dark cycles.

Catfish

During the early stages of development in the catfish (Clarias gariepinus), prolonged exposure to light causes distress, which delays growth and increases aggression.

As a result, these effects have a direct impact on the survival of the catfish. Continuous activity and increased aggression in this same species kept under longer lighting schemes have resulted in elevated lactate and cortisol levels.

After prolonged exposure to darkness, the catfish’s dermis becomes dark, increasing its market value.

What about Goldfish?

Like other species, goldfish are also affected by light to some extent. Since goldfish do not have eyelids, they rely on cues from their environment to decide when to care, rest, and when to be alert.

Thus, goldfish are completely dependent on light. When it gets dark, the goldfish thinks it’s the ideal time to head off and stop eating and moving around. What’s more, when there is light, goldfish will usually come out and start eating and appreciating the food.

Thus, these are the effects of light on the survival of fish. It is clear that the effect of light depends on the type of fish and their life stage.

Are there any varieties that fish are attracted to?

White and green lights attract fish the most due to their brightness and ability to lure them from a distance. Apart from these two colors, fishes are also attracted towards yellow color.

How does dark light actually affect fish?

Most people use dark lights to heat their fish aquariums. Whatever the case, it is not advisable to heat or illuminate the fish tank with dark light. It is important to provide lighting in the aquarium that reflects the normal lighting that fish experience in nature.

Due to their UV properties, dark lights should be used sparingly. Dark lights in the 315 to 380 nm range are the most dangerous.

However, shouldn’t there be something said about UV light? We should discuss that at this point!

How does UV light affect fish?

By enabling shadows to replicate more quickly, UV light builds the fish’s general resistance level to UV radiation. The tone of goldfish is also affected by the amount of ultraviolet light they receive.

Higher UV levels tend to result in vivid colors in fish, while lower levels tend to result in paler colors.

What To Consider About Lighting in An Aquarium?

When there isn’t any light in the fish aquarium, the color of the fish and the plants inside won’t look as beautiful and colorful, especially when the tank is placed in a dark area. Thus, lighting the aquarium is crucial.

As you can see, the fish can be affected negatively or positively by the light, so you have to make sure that you’re lighting the aquarium in a good way.

For that reason, I’m going to tell you all of the things that you must consider to ensure that the lighting in your fish tank isn’t doing any harm to them. So, let’s dive in!

1) Consider The Fish species!

Thousands of fish species exist around the world, as you know. So, the light requirements are different for all of them. Once you have chosen the species you want to house, you can better assess the lighting requirements.

Before choosing aquarium lighting, make sure it will provide the right kind and amount of light for the particular subspecies you plan to keep.

Obviously, you’ll do your own research, but to get you started, let me tell you what type of fish people usually get in their aquariums and their light requirements.

Most Common Species That You Might Get Home And Their Light Requirements!

Most of the species that people like to get for their aquariums come from rivers, clear lakes, and streams. Since these species of fish are more exposed to the sun, they’re used to living in the sunlight and the warming rays of the rainforest weather.

It is important, however, to provide darker areas when it is bright to accommodate fish that prefer to hide from the light. Plants and rock outcroppings provide a natural habitat for these fish.

But not all species are the same. Some species of fish like to live in a dimmer environment as well. So, please make sure that you’re researching enough about the species that you’re bringing home.

This will make it easier for you to decide what type of lighting you have to do in your fish aquarium

2) The Type Of Light Matters A lot

The type of light you’re putting in your fish aquarium matters a lot. The fish may react differently to it.

The most common lights that people always put in their aquariums are incandescent, fluorescent, or LED lights for fish. Is it true that incandescent light can be harmful to your fish?

Yes, they can be harmful because they may create too much heat in the water, especially in the area closest to the aquarium light.

Since fish can’t handle so much heat, they’ll avoid swimming in the hot part of the aquarium and will only swim in the cold one. But what about LED lights? Can you consider using them in your aquarium?

Yes, you can consider LED lights for your aquarium, as they virtually don’t create any heat in the water. The best thing about these lights is that they come in so many colors. This means you’ll be able to choose your favorite color.

3) Effects Of Lighting On Aquarium Plants

Plants, in addition to fish, contribute to the aquarium’s aesthetic appeal. Light is very important to plants, as it helps them remain healthy. Thus, you have to be aware of the amount of light required for the types of plants in your aquarium.

Just like fish, the amount of light required for plants depends on their type. Some types of plants need more light, while others need less. Considering some common plant types and their light requirements, let’s take a look at some of them.

Plants Light Requirement!

• Tropical Plants: For proper photosynthesis, tropical plants require a large amount of light. In their natural habitat, plants that grow near water’s surface are especially susceptible.
• Plants With Red Colors In The Stems And leaves: The light level must be very high for plants with reddish stems or leaves.

These are two common types of plants that people like putting in their fish aquariums. If you’re thinking of putting another type of plant there, then make sure you do proper research about the lights’ effects on it.

Also, see how intense light will affect the plant. This way, you’ll be better able to get plants that are suitable for the light of the aquarium and will make your aquarium look beautiful.

4) Day And Night Cycle Issues For The fish.

The animals that live in aquariums will be affected by a steady level of light in different ways. Using day and night lighting, aquarium owners can mimic the light levels found in a natural setting and replicate the light present in a species’ habitat.
Keeping an eye on nocturnal activities is made possible by moonlight, also known as “nightlights.” Tropical fish and plants are usually found in aquariums, which receive 12 hours of light daily.

For hobbyists, this eliminates the need to change their timers on a seasonal basis. If you want to make sure your fish receive light at the right time, you can use a simple timer that will automatically turn the on and off the light as needed. Sounds interesting?

A fish keeper should consider the seasons when changing from daylight to nightlight for aquarium specimens from northern and southern regions.

Moreover, if the family will be watching TV in the evenings, it is best to keep the tank out of direct sunlight and allow it at least 12 hours of darkness each day.

Fish keepers should consider the seasons when changing from day to night lighting when dealing with species from northern or southern regions.

In addition, to keep the lights on at night for the family’s entertainment, the tank should be kept away from direct sunlight and left in the dark for at least 12 hours each day.

5) Get The Lights That Bring Out The Colors of the Fish.

How would you feel if the lights you installed in the fish aquarium failed to bring out the color of the fish? Obviously, it won’t be good to see. What type of lights should you put in your fish tank to bring out the beautiful colors of the fish?

Bright lights are always preferred as they darken the pigments of the fish, making them look unique and eye-catching. What about the discus fish?

Will they like a bright tank? A lot of folks say that the discus fish don’t like a lit-up tank, which is absolutely wrong. They really like it, but in the beginning, when they’re not used to the light, they might not like it.

Because they’re not used to the light. But, after 4 to 5 days, they’ll start getting used to the light and start liking it. Their coloring will darken, and they will grow quickly. Isn’t it amazing to know how valuable lighting is for fish?

So, these are some of the tips for putting perfect lights in your aquarium that don’t harm the fish.

I guess I’ve covered all the effects of light on fish. As a next step, let’s answer a few frequently asked questions. Let’s begin!

FAQ

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Lightening and cleaning factors are the two essential needs and requirements for the fish tank. By the maintenance of both these factors, you can effectively ensure the best healthy environment for the fishin the tank. However, various people are always searching for profound knowledge about lighting aspects of aquariums.

For that, they are curious to find out why aquarium need light. It is self-evident to predict. As the aquarium contains the natural plant, it’s very crucial to maintain the natural process of photosynthesis. Along with the photosynthetic need, the proper light factor inside the aquarium regulates the oxygen cycle for the fish and the plants.

Lightening Factor for Fishes
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For a more detailed perspective, here we will present a comprehensive guide about the need and importance of light for the fish tank and fishes inside it.

Let’s explore the details in the below section for your understanding.

Need of Lightening in Aquarium

It is a general fact that if you have a tropical aquarium, it is better to expose it to light for around 8 to 12 hours of the day. This time is crucial to complete the day cycle for the plants and the fishes inside it.

Also, the fish tank should be placed in some sort of well-visual area. With the tank or aquarium receiving appropriate lightening;

• You can visualize the atmosphere of the fish appropriately. All the fish aesthetics that you enjoy, is made in the lightning factor. For the user’s convenience and appropriate picturization, you have to manage the light factor in a better and more well-designed way.
• The light factor also proves very worthy for the fish itself. It assists them in finding out their way to move inside the aquarium quickly so that they won’t hit any of the plants or other artificial decoration stuff.
• The fishes also need light for their proper eating activity and all other movement stuff. However, after a few hours of the thrilling movements, they crave the darkness for relaxation.
• The appropriate lighting around the aquarium is essential in the photosynthesis process. The light directly helps the natural plants inside the aquarium to grow normally.
• Plants can synthesize appropriate nutrients in the presence of light that helps them to remain green and naturally strong to support the natural surroundings.

As light plays a vital role in the fish tank, the people who are dealing with the tank inquire about the time of light exposure. When the question about time factor for the fish tank and lightning is taken to the experts, they need help deciding the proper estimation. 

Time Factor for Light Exposure

It varies as per the breed of fish inside it or the type of aquarium you are having. So all those who are personally involved in care keeping activity for aquariums can answer best about this factor.

The variation can be best exemplified in the goldfish and cichlid. In terms of goldfish, it fades and does not appear and visualize when it does not receive an adequate concentration of light daily. At the same time, the ram cichlids may only grow with light.

On the general stance, a standard fish tank can appropriately survive under the 10-hours of exposure to light. However, the exposure needs and demands exceed those for the tropical tank or the fish. Averagely, they need light exposure of a minimum of 12 hours or more.

On the other hand, if your fish are habitual of cold surroundings or water, then you have to keep it in the proper lighting for around 8 hours in total of the day.

Sometimes, there is a situation where you do not have any natural plants inside your aquarium. At that time, you do not need any particular light perspective. These aquariums need fewer lighting factors.

Light Exposure at Night

Usually, most fish do not need light during the night hours of relaxation. Because they prefer to sleep during these hours and need complete darkness all around. Thus there is no need to keep your aquarium under the aspect of light.

Whereas in exceptional cases, you need lighting even at night. For example, if you have snails in your fish tank, you must accompany them with light bulbs, even at night.

Because they are habitual in eating at night, and for eating, they need light to locate the food.

Thus for meeting the night needs, it is recommended to go for the moonlight aquarium bulbs. So that you can try your best to maintain the natural atmosphere around the aquarium. These moonlight bulbs help the audience to illuminate the surrounding whenever they need light in the night hours.

It won’t carry any challenging aspects and provide a very calm gesture that feels suitable by the fishes as well.

Apart from all these exceptional points, it is usual for the fish owners to turn the lights off to sleep appropriately in complete relaxation and calmness.

The Final Statement

Being a fish lover, you must be clear about all related factors to keep things on track. Why aquarium need light? This is one such significant factor to look for.

In the section depicted above, we present the most comprehensive guide about the need of aquariums for lightning. After having a precise overview, we hope you are clear about most of your mind queries.

link to Does Aquarium Fish Sleep?/ A Comprehensive Guide! link to Can 2 betta fish live together ? All you need to know about betta fish

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