and bear paws and fish
Welcome friends back to this little different pet fish column again, I am the fish and bear paw have both.
When summer comes, individual aquarists may encounter the problem of lack of oxygen in ornamental fish.
Whenever such a disturbing thing occurs, under the premise of no power outage and hardware failure, we will unconsciously think that this is caused by high temperature weather.
From a certain point of view, such a judgment is also reasonable, because the high temperature will cause the dissolved oxygen value of the water body to drop, which is scientifically based.
However, we must not think that only "high temperature" can cause the result of "hypoxia".
If we blame all the factors on high temperatures, we risk misleading fish farming practices.
Today, I will try to analyze what factors will lead to the embarrassment of lack of oxygen in the fish tank.
Students, please sit down and listen to the noise.
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What is the oxygen consumption of ornamental fish
Before studying this problem, it is necessary to learn a technical vocabulary - oxygen consumption.
The oxygen consumption of ornamental fish refers to the absolute value of the oxygen consumed by the fish body per unit of time. We usually use mg/kg.h as the unit of measurement.
Oxygen consumption is divided into two types: standard oxygen consumption and active oxygen consumption, when we discuss whether the requirements of an ornamental fish for dissolved oxygen are high, we refer to the value of standard oxygen consumption.
Standard oxygen consumption measures the basic oxygen consumption of ornamental fish, without considering the oxygen consumption generated by the intense movement of ornamental fish when avoiding predators, nor does it consider its oxygen consumption due to anaerobic exercise in other special cases.
Different ornamental fish have different metabolic needs due to different living habits, habitats and growth patterns, resulting in different needs for oxygen consumption. According to the difference in the demand for dissolved oxygen of different ornamental fish, we can divide ornamental fish into four categories.
Category I: Class A ODS.
This type of fish has a very high demand for dissolved oxygen in the water body, they grow in the waters of the rapids in their natural state, and they must grow in the cold waters of the cold zone. Because it is impossible to produce such a high dissolved oxygen value in the waters of tropical fish areas.
Their basic value of dissolved oxygen to water in summer is above 7mg/l, for example, the famous salmon trout belongs to this type of fish.
To be honest, many of our ornamental fish players' fish tanks do not reach such a value, so our aquarium circle has almost no such type of ornamental fish. This type of fish may only be seen by native fish players in the north of Heilongjiang in China.
The second category: class b od-depleting fish.
This type of ornamental fish has relatively high requirements for dissolved oxygen values in water, and the requirements for dissolved oxygen are in the range of 5 to 7mg/l.
For example, the famous flat-mouthed catfish in China's native fish circles is this type of ornamental fish, and friends who have played with the broadfin carp must also be very speechless by its characteristics of being prone to hypoxia and death, because it also belongs to this category.
Category III: C-class ODS.
This is a class of ornamental fish with relatively low oxygen consumption requirements. As long as the dissolved oxygen reaches 4mg/l, it can swim around comfortably.
These fish are usually native fish temperate and subtropical still water or slow water, can adapt to the most fish tank dissolved oxygen environment, so they are also called "broad oxygen fish".
In short, more than 90% of the ornamental fish on our market belong to this category.
The fourth category: D-class ODS fish.
The requirements for dissolved oxygen values for such ornamental fish are only 0.5mg/l, and in the eyes of many ornamental fish players, their vitality is very anti-heavenly.
These fish usually have special respiratory organs that allow them to survive in a harsh dissolved oxygen environment, but when other fish are braided due to lack of oxygen, they can laugh and watch the flowers of the world blossom and fall.
For example, the familiar fighting fish, climbing perch and snakehead, and then the multi-finned fish, bowfin fish and lungfish that you may not have heard of.
Conclusion: When we consider the cause of oxygen deficiency in an ornamental fish, we must first find out how dependent our ornamental fish are on dissolved oxygen. If you're new to it, try to avoid raising ornamental fish species that have a high level of dissolved oxygen.
A logarithmic function of ornamental fish weight and oxygen consumption
The figure above is a logarithmic function between the weight of ornamental fish and the corresponding oxygen consumption.
r - represents the oxygen consumption of ornamental fish; w – represents the weight of the fish; b - represents the fine-tuning index corresponding to different ornamental fish; a - The band represents the age of the fish.
From this formula, we can deduce that there are at least three factors that affect the oxygen consumption value of an ornamental fish: the age of the fish, the species of the fish, and the weight of the fish.
These three factors add up to the three intrinsic factors that affect the oxygen consumption of ornamental fish.
In other words, it is easy for everyone to understand -
Ornamental fish of different ages have different requirements for dissolved oxygen;
Different ornamental fish species have different requirements for dissolved oxygen;
Different weights of ornamental fish have different requirements for dissolved oxygen.
Conclusion one: considering the question at the beginning of this article from the internal factors of ornamental fish, the answer may become: When the ornamental fish begin to lack oxygen, it may not be caused by a factor of high summer temperature, or it may be that the age of the ornamental fish is too young (the requirements of the juvenile fish for dissolved oxygen are greater than those of the adult fish), or it may be that the ornamental fish species you raise are more oxygen-consuming, or it may be that your ornamental fish has increased in weight, so the oxygen consumption has increased.
In addition to these three intrinsic factors, there are also several external factors that affect the oxygen consumption value of ornamental fish.
On the importance of a fish tank aeration pump
The first factor: temperature.
In fact, in the face of this factor, there are two meanings.
The first meaning is well known - the higher the water temperature, the lower the dissolved oxygen. On this point, almost every aquarist who has attended junior high school can understand, so I will not repeat it.
The second meaning is that many aquarists are not familiar with it - the lower the water temperature, the lower the requirements for dissolved oxygen for ornamental fish.
For example, silver carp, one of the four major fish we all know, has a demand for dissolved oxygen in the winter when the water temperature is low.
Let's think about it in reverse: Suppose you buy a vat of cold-water fish in the winter and you run out of oxygen in the summer. In addition to the decline in the effective dissolved oxygen value of the water body due to the increase in water temperature, there is also a factor that your ornamental fish's demand for dissolved oxygen has also doubled.
Between this increase and decrease, there is a fatal dissolved oxygen threshold, below which the fish will die due to lack of oxygen.
The second factor: the concentration of carbon dioxide in the fish.
This is something that many novice gamers who are new to watching fish are not familiar with.
Ornamental fish will absorb oxygen through the gills, and at the same time, the carbon dioxide in the fish will be expelled, which will allow the hemoglobin in the fish to have more energy to transport more oxygen molecules to the various tissues in the body.
However, if carbon dioxide cannot be smoothly expelled from the body, the speed at which dissolved oxygen enters the fish will slow down. The fish then begin to enter a state of hypoxia.
Under what circumstances is the release of carbon dioxide from the body to the outside of the body blocked?
A: When the concentration of carbon dioxide in the water body of the fish tank is high.
So we want to avoid the situation that the concentration of carbon dioxide in the fish tank is too high, which is mainly for those friends who use grass tanks to raise fish.
The third factor: the pH of the fish tank water.
As we all know, the pH ph value of suitable ornamental fish is between 6 and 8.5, if the ph value is too high beyond this range, what kind of results will there be?
I wonder if you have heard of a concept called "acidosis" in the aquarium circle?
"Acidosis" refers to the phenomenon of the death of ornamental fish caused by the pH of the fish tank water being too low.
As you know, Hezi likes to get to the bottom of the issue of fish farming.
Later, Hezai studied this problem and understood it.
The essence of acidosis is that the low pH destroys the wall on the surface of the gill piece of ornamental fish, and this wall is the "security inspector" responsible for the inflow and exit of dissolved oxygen and carbon dioxide into and out of the fish.
Too low pH kills the "security inspector", is there any reason why the ornamental fish will not die?
In other words, with the decline in the pH of the fish tank, the speed of dissolved oxygen entering the fish body is also synchronously reduced, and the ornamental fish are also short of oxygen, which has nothing to do with whether the water temperature is high or not.
The fourth factor: salinity in water bodies.
On this question, Hezai has made a detailed answer in the article of the past few days, and I will simply repeat it today.
When the salinity in the tank water suddenly increases or decreases, the ornamental fish will briefly activate a self-protection mechanism - they will enter a temporary near-semi-dormant state by reducing the entry of dissolved oxygen.
When this semi-dormant state has passed, the ornamental fish adapt to the new salinity, and the fish body will activate a retaliatory mechanism - in the following days, the fish will absorb a large amount of oxygen, increasing the demand for dissolved oxygen in the water body, thus inducing the ornamental fish to lack oxygen.
So, in the hot summer, if the density of ornamental fish in your fish tank is too high, don't use salt in the fish tank!
The words in the heart of the boy: there are many factors that the ornamental fish lack of oxygen, and we cannot blindly complain about the high temperature weather. No matter how hot the weather is, we must calm our hearts, let the brain cool down, take a good look at today's article, you will find the truth about the lack of oxygen in your fish tank, and avoid unnecessary wrong operation. In addition, many friends want to know the best way to deal with the lack of oxygen in the fish tank. In fact, there is a trick that I have never published on the Internet, and I will make an exception today to publish it in the headline circle of the hustler! If you want to learn the private fish farming notes of The Cow boy, please join the private circle of the child by clicking on the blue fish icon below, you will not regret it!
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