How Goldfish Went From Pretty To Invincible And Back Again

TL;DR

Goldfish, bred for their beauty, possess unique biological traits that make them resilient, adaptable, and able to withstand extreme temperatures, but the pursuit of exotic varieties by breeders has led to a loss of genetic diversity and the decline of their survival skills.

Transcript

Thanks to Brilliant for  supporting this SciShow video! As a SciShow viewer, you can keep  building your STEM skills with a 30 day free trial and 20% off an annual premium  subscription at Brilliant.org/SciShow. If you had pet fish as a kid,  chances are it was a goldfish. Hundreds of millions of them  are sold in the US each year. And it’s easy to... Read More

Key Insights

• 💅 Goldfish were originally bred for their beauty, but their resilience and ability to withstand extreme temperatures contributed to their spread across the world.
• 🤑 Goldfish possess a unique genome with four sets of chromosomes, allowing for the evolution of new physical traits while retaining older ones.
• 😘 Goldfish's ability to survive in low oxygen conditions and tolerate a wide range of temperatures made them ideal for transportation and environmental adaptability.
• ❓ Goldfish have been used as model organisms in studies on evolution, toxicity testing, and understanding genetic diversity.
• 🌸 The pursuit of exotic goldfish varieties has resulted in a loss of genetic diversity and the decline of survival skills.
• 🥺 Fancy goldfish varieties often have physical traits that hinder their swimming abilities and can lead to health problems.
• 😘 Low genetic diversity in goldfish makes them more vulnerable to diseases and environmental changes.

Questions & Answers

Q: How did goldfish develop their unique genome with four sets of chromosomes?

Goldfish evolved their unique genome through a process called whole genome duplication, which occurred approximately 8 to 14 million years ago. This duplication allowed for the evolution of new traits while retaining older ones.

Q: How were goldfish able to survive long sea voyages?

Goldfish have a remarkable ability to live with almost no oxygen, which likely evolved as a survival mechanism during the winters in ponds. They can convert lactic acid, produced by anaerobic respiration, into ethanol, which can be safely expelled through their gills.

Q: Why were goldfish used in toxicity testing?

Goldfish have a large surface area of gills and blood vessels, making them highly efficient at absorbing substances. This made them ideal for testing the toxicity of various chemicals and substances.

Q: Why have fancy varieties of goldfish lost their survival skills?

The pursuit of unique and exotic goldfish varieties by breeders has led to a loss of genetic diversity. Many fancy goldfish varieties have physical traits that hinder their survival skills, such as hindering their ability to swim or causing retinal damage.

Summary & Key Takeaways

• Goldfish were originally bred for their beauty and shimmering red scales, but their resilience and ability to withstand a wide range of temperatures made them popular pets.

• Goldfish possess a unique genome with four sets of chromosomes, allowing for the evolution of new physical traits while retaining older ones.

• By the 18th century, goldfish had spread across the world, thanks to their ability to survive long voyages and their adaptability to different environments.