Listen to the Song – The Stranger in the Water
The Prussian Carp
The Stranger in the Water
The complete lyrics are included in the companion book, Our Jewels in the Water, allowing readers to follow every song while discovering the remarkable stories behind our freshwater fish.
Enjoying the music?
The companion book Our Jewels in the Water includes the full lyrics, additional stories, exclusive photographs and beautiful illustrations for every species.
“A silver stranger slips quietly beneath the surface — adaptable, mysterious and carrying one of the most extraordinary survival stories in the freshwater world.”
Species Profile
The Prussian Carp (Carassius gibelio) is a remarkably adaptable member of the carp family, Cyprinidae.
At first glance it can easily be confused with the Crucian Carp, but the Prussian Carp has its own distinctive history and biology.
Usually silver-grey or silvery bronze in colour, it is a deep-bodied fish capable of surviving in a wide variety of freshwater habitats.
Its natural origins are associated with Eurasia, but through introductions and expansion it has appeared far beyond its original range.
Where it becomes established outside its native range, its ability to survive and reproduce successfully can make it a significant concern for native freshwater ecosystems.
It truly is The Stranger in the Water.
Clive’s Story
For an angler, identifying fish correctly has always been part of the fascination.
Every now and again something appears in the landing net that makes you look twice.
The Prussian Carp is exactly that sort of fish.
At first you might think you are looking at a Crucian Carp.
Then you begin noticing the differences.
The colour isn’t quite right. The body looks slightly different. Something about the fish makes you question your first identification.
That is one of the wonderful things about fishing.
However long you have spent beside the water, there is always another mystery waiting beneath the surface.
The Prussian Carp is certainly one of them.
Natural History
Prussian Carp are extremely adaptable and can inhabit lakes, ponds, reservoirs, canals and slow-moving rivers.
They are omnivorous, feeding upon aquatic invertebrates, insect larvae, crustaceans, plant material and other available food.
Perhaps the most extraordinary aspect of the Prussian Carp is its reproductive biology.
Some populations contain large numbers of females and can reproduce through a process known as gynogenesis.
During this process, sperm from a male of another related fish species can stimulate the Prussian Carp’s eggs to begin developing, while the resulting young normally inherit their genetic material from the female.
This remarkable reproductive strategy can allow populations to increase rapidly under suitable conditions.
Combined with the species’ ability to tolerate a range of environmental conditions, it helps explain why Prussian Carp can become extremely successful when introduced into new waters.
Interesting Facts
- Scientific name: Carassius gibelio
- Family: Cyprinidae.
- Closely related to the Crucian Carp and Goldfish.
- Usually silver-grey or silvery bronze.
- Can be difficult to distinguish from other Carassius species.
- Highly adaptable to different freshwater habitats.
- Omnivorous.
- Some populations can reproduce through gynogenesis.
- Female-dominated populations can occur.
- Has spread considerably beyond parts of its original range.
- Can become invasive when introduced into new ecosystems.
- Correct identification is important when recording unusual catches.
Behind the Song
When writing The Stranger in the Water, I wanted to capture the mystery surrounding this unusual fish.
There is something intriguing about a species appearing in a water where an angler may not expect to find it.
At first it looks familiar.
Perhaps a Crucian.
Perhaps even a strangely coloured Goldfish.
But look more carefully and another story begins to emerge.
The Prussian Carp’s extraordinary reproductive biology makes that story even more remarkable.
The song therefore became about more than an unfamiliar fish.
It became a story of adaptation, survival and a stranger quietly establishing itself beneath the surface.
Conservation and Invasive Species
The conservation story of the Prussian Carp is complicated.
Within ecosystems where it naturally belongs, it is simply another part of the freshwater community.
When introduced elsewhere, however, it can become highly successful and potentially compete with native fish.
Its adaptability and unusual reproductive strategies mean populations can sometimes expand rapidly.
There is also concern about interaction and hybridisation amongst closely related Carassius species, particularly where vulnerable native Crucian Carp populations occur.
For this reason, fish should never be moved between waters without the appropriate permission and controls.
An apparently harmless introduction can have consequences lasting for generations.
Protecting native fish means protecting the ecological balance of the waters in which they evolved.
Clive’s Reflection
The Prussian Carp represents another side of the story behind Our Jewels in the Water.
Not every fish we discover in our waters necessarily belongs there.
Some have travelled because people moved them.
Others have expanded their range as environments changed.
And occasionally a new arrival can alter an ecosystem in ways nobody originally expected.
That doesn’t make the fish itself a villain.
The Prussian Carp is simply doing what nature has equipped it to do extraordinarily well — survive.
Our responsibility is to understand these changes and protect the native species that may be affected by them.
For the angler, however, there will always be something fascinating about lifting an unfamiliar silver fish from the water and wondering:
What exactly have I caught?
Perhaps sometimes the greatest mysteries are not found in distant oceans.
Sometimes they are swimming quietly beneath our own feet.
“Every stranger has a story — but in our waters, we must also understand how that story began.”