# Coelacanth — Facts, Threats & Conservation

*Latimeria spp. — coelacanthiform lobe-finned fishes (two living species)*

> The coelacanth is a lobe-finned deep-sea fish in the genus Latimeria, known from fossils and assumed extinct until a living specimen was landed off South Africa on 22 December 1938; two species survive in the western Indian Ocean and Indonesia and are listed as Critically Endangered and Vulnerable respectively.

**IUCN status:** Critically Endangered (West Indian Ocean coelacanth) — the Indonesian species is Vulnerable  ·  **WARN range:** Western Indian Ocean, Indonesia

## Quick facts
| Fact | Value |
| --- | --- |
| Living species | Two — western Indian Ocean and Indonesia |
| Depth | Typically 100–700 m |
| Reproduction | Live-bearing — internal fertilisation |
| Discovery | 22 December 1938, off South Africa |
| Fin type | Lobed, on fleshy stalks |
| Main threat | Accidental deep-water bycatch |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Sarcopterygii (lobe-finned fishes)
- **Order:** Coelacanthiformes
- **Family:** Latimeriidae
- **Genus:** Latimeria
- **Species:** L. chalumnae and L. menadoensis

## Conservation status
- **Status:** Critically Endangered (L. chalumnae); Vulnerable (L. menadoensis)
- **Population:** No reliable estimate — likely fewer than 1,000 mature individuals for L. chalumnae
- **Trend:** Decreasing
- **Assessed:** 2019
- **CITES:** Appendix I (L. chalumnae)
- Slow life history and localised deep habitat mean even low bycatch rates can be significant. Protection depends on enforcing gear restrictions in known coelacanth areas.

## Key facts: Coelacanth
- Coelacanths were known only from fossils until 1938, when Latimeria chalumnae was identified from a fish landed off South Africa — the classic living-fossil rediscovery.
- Two living species exist: L. chalumnae in the western Indian Ocean and L. menadoensis in Indonesia.
- They are lobe-finned fishes (Sarcopterygii), more closely related to lungfish and tetrapods than to ray-finned fish such as salmon or tuna.
- Lobed pectoral and pelvic fins move on fleshy stalks; the paired fins of early four-legged animals are thought to derive from similar structures in ancient sarcopterygians.
- Coelacanths give birth to live young after internal fertilisation — unusual among fishes and one reason populations recover slowly from mortality.
- The West Indian Ocean coelacanth is Critically Endangered; accidental bycatch in shark and deep-set fishing gear is the main documented threat.

## The 1938 rediscovery
By the late nineteenth century, coelacanths were fossils — impressions in rock from the Devonian through the Cretaceous, the last records roughly 66 million years old. No one expected a living population.

Captain Hendrick Goosen brought an unusual blue fish ashore in December 1938. Courtenay-Latimer contacted the ichthyologist J. L. B. Smith, who confirmed it as a coelacanth and named the genus Latimeria in her honour. Smith's famous telegram — "MOST IMPORTANT PRESERVE SKELETON AND GILLS = FISH DESCRIBED" — captured the shock. The find did not mean coelacanths were unchanged since the Mesozoic; molecular clocks show substantial evolution. It meant a lineage thought lost was persisting in deep water, largely invisible to science until industrial fishing and submersibles reached their depth.

## Living fossil — what the phrase gets wrong
Coelacanths are often called living fossils, and the label draws traffic because it suggests an animal frozen in time. The reality is more precise. Living coelacanths are the surviving members of a ancient order, but they are not identical to their fossil relatives. Genome work shows gene loss, changed regulatory sequences and adaptations to deep, low-oxygen habitats that their Cretaceous counterparts did not share.

The useful comparison is with extinct-animal profiles at /wildlife-guides/extinct-animals/ — species assumed gone that have living parallels facing the same pressures. Coelacanths inverted the story — assumed extinct, then found — but the conservation lesson matches. Slow reproduction and specialised habitat make a lineage fragile once human fishing reaches its depth. Being ancient does not confer immunity.

## Anatomy that links fish to land
Coelacanths carry lobed fins — muscular stalks with a central axis of bones arranged in a pattern echoing the limb bones of early tetrapods. They are not legs, and the coelacanth is not an ancestor of humans, but the shared architecture illustrates how sarcopterygian fins could be modified into weight-bearing limbs in related lineages that did colonise land.

Other features are equally distinctive. The skull hinges intracranially: the upper jaw and braincase lift together, opening the mouth wide for whole-fish prey. A fat-filled notochord-like organ replaces a swim bladder, helping buoyancy control in deep water. Electrosensory pores on the snout detect prey in darkness. These are adaptations to a deep, cave-adjacent life, not a preview of terrestrial walking — but they made the animal central to textbooks on vertebrate evolution.

## Conservation in deep water
Latimeria chalumnae is Critically Endangered; L. menadoensis is Vulnerable. Populations are small, localised and slow to replace losses. Females produce relatively few young after gestation estimated at around thirteen months in some studies — exact figures vary, but the life history is unambiguously slow.

Documented mortality comes mainly from accidental bycatch in deep-set gillnets and other gear targeting sharks and oilfish. Coelacanths have no commercial fishery of their own; their value is scientific and cultural. Protected status exists in several range states, and international trade is restricted under CITES Appendix I for L. chalumnae. Submersible surveys and tagging programmes have mapped caves and migration routes, but deep-water species are expensive to monitor — population sizes remain uncertain, and a Critically Endangered listing reflects risk as much as a precise head count.

## What WARN does
WARN publishes free education on species whose stories connect evolution, extinction and survival. Coelacanths show how a lineage can persist unseen in deep habitat until fishing reaches it — a parallel to the extinct-animal profiles elsewhere on the site, where the pressure arrived too fast for recovery.

If this guide helps you understand wildlife and the pressures it faces, a gift to WARN supports habitat protection and free public education in our partner countries.

## Frequently asked questions: Coelacanth
### What do coelacanths eat?
They are piscivores — fish eaters — taking reef and slope species that drift past caves at night. They snap prey with a rapid bite aided by the hinged skull and swallow whole fish head-first.

### Where do coelacanths live?
Deep rocky slopes and lava caves, mainly 100–700 m depth. Latimeria chalumnae occurs around the Comoros, Madagascar and East African coast; L. menadoensis off Sulawesi and nearby Indonesian islands.

### Are coelacanths dangerous to humans?
No. They live far below diving depth for sport divers and are not aggressive toward people. Contact occurs only when fish are brought up accidentally in fishing nets.

### How long do coelacanths live?
Exact longevity is still debated. Growth-ring counts and modelling have suggested lifespans of several decades, with some estimates approaching a century — methodology is contested, so published ranges should be read cautiously.

### How big is a coelacanth?
Adults commonly reach roughly 1.5–2 m total length and can weigh on the order of 80 kg. Females are often larger than males.

### Why was the coelacanth called a living fossil?
Because it belongs to a lineage known from fossils millions of years old and assumed extinct until 1938. Living coelacanths have still evolved — the phrase describes surviving antiquity of the group, not unchanged anatomy.

## Sources
- [IUCN Red List — Latimeria chalumnae](https://www.iucnredlist.org/species/11375/84905383)
- [IUCN Red List — Latimeria menadoensis](https://www.iucnredlist.org/species/135484/4494390)
- [Smithsonian Ocean — coelacanth](https://ocean.si.edu/ocean-life/fish/coelacanth)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/coelacanth