Aquatic Animal Growth: The Ultimate Cheat Code


Platy and Guppy fry enjoying a smidge

Aquarium enthusiasts have been experimenting with adjusting water temperature and parameters to promote the growth of aquarium animals and influence the gender of their offspring for decades. 

Temperature-Dependent Sex Determination (TSD) is a type of environmental sex determination in which the temperatures experienced during embryonic/larval development determine the sex of the offspring. It is observed in reptiles and teleost fish, with some reports of it occurring in species of shrimp. TSD differs from the chromosomal sex-determination systems common among vertebrates. 

At the optimum temperature for a given species, an equal number of male and female offspring are produced. Incubation at either end of the acceptable temperature range normally produces offspring of all one gender. The closer the temperature to the ideal for the species, the closer the offspring are to a gender ratio of 1:1.

The eggs are affected by the temperature at which they are incubated during the middle one-third of embryonic development. This critical period of incubation is known as the thermosensitive period. The specific time of sex-commitment is known due to several authors resolving histological chronology of sex differentiation in the gonads of turtles with TSD. The cortisol-mediated pathway and epigenetic regulatory pathway are thought to be the potential mechanisms involved in TSD. 

While TSD has been observed in many reptile and fish species, the genetic differences between sexes and molecular mechanisms of TSD have not been determined.

Breeders use this method to produce a higher number of fish of a particular gender, which can be more valuable in the market. For example, in the case of guppies, males are more colorful and attractive than females, and therefore, more expensive. By manipulating the water temperature, breeders can produce more male guppies, which can be sold at a higher price. Similarly, in the case of tilapia, male fish grow faster and are more desirable for commercial purposes . By manipulating the water temperature, breeders can produce more male tilapia, which can be sold at a higher price.

Aquarium breeders use similar methods to speed up the growth of aquarium animals, including feeding them high-protein diets, increasing the water temperature, and using hormones. However, these methods can have ethical implications. For example, feeding fish high-protein diets can lead to obesity and other health problems. Similarly, increasing the water temperature can cause stress and disease in fish. The use of hormones can also have negative effects on fish health and behavior.


The issue of speeding up the growth of aquarium animals is complex and multifaceted. On the one hand, faster growth rates can help breeders produce more fish in less time, which can be beneficial for the aquarium industry. On the other hand, these methods can cause harm to the animals such as shorter lifespan and increased risk of disease, and may be considered inhumane. Additionally, the use of hormones and other growth-promoting substances can have negative environmental impacts, such as contaminating water sources.

It is important for aquarium breeders to consider the impact of their practices and take steps to minimize harm to the animals and the environment. This may include using alternative methods to speed up growth, such as selective breeding or providing optimal living conditions for the animals.

Choosing a breeding male

In conclusion, while adjusting aquarium water temperature and parameters to speed up the growth of aquarium animals and influence the gender of their offspring may seem like a good idea, it can have serious ethical implications. It can cause stress, affect the immune system of fish, and leave them open to a range of health ailments. It can also reduce the lifespan of fish and other aquatic animals. Therefore, it is important to maintain the correct temperature and other parameters to ensure the health and well-being of aquarium animals.


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