Gili Islands deep dive
Gili Trawangan has two long-running sea turtle hatcheries that incubate eggs and release hatchlings, drawing thousands of tourists. Marine biologists have raised real concerns about post-hatch holding times, tank conditions, and survival outcomes after release. Properly run hatcheries can support populations; poorly run ones can harm them. This guide explains what to look for, the legitimate criticisms, and the ethical alternatives.
# Gili Sea Turtle Hatcheries: Honest Conservation, Real Controversy
Walk along Gili Trawangan's east coast and within minutes you will pass at least one sea turtle hatchery. There are two long-running hatcheries on the island and a smaller operation on Gili Meno. They are popular tourist attractions — small fenced compounds with tanks of baby turtles, donation boxes, and information panels about endangered species. They are also among the most contested conservation operations in Indonesia.
This guide is for the tourist who wants to make a thoughtful choice about whether to visit, donate, or recommend these hatcheries. The picture is not as simple as "hatcheries good, no hatcheries bad."
Three turtle species occur regularly around the Gilis: green turtles (most common), hawksbills (less common, more endangered), and occasionally olive ridleys. All three are listed as threatened or endangered under various international frameworks.
In a healthy ecosystem, female turtles return to natal beaches to nest. Eggs incubate buried in the sand for around 50–60 days, hatchlings emerge en masse, scramble to the sea overnight, and disperse into pelagic life. Predation is high — most hatchlings are eaten by birds, crabs, fish, or sharks within their first weeks. Of every 1,000 hatchlings, perhaps one or two reach reproductive age. This is normal sea turtle ecology and the species evolved to survive it.
The threats sea turtles need protection from in modern conditions are: poaching of eggs (still common in Indonesia), poaching of adults for shell and meat, plastic pollution (especially bags mistaken for jellyfish), boat strikes, fishing net entanglement, and beach habitat destruction. Population recovery requires reducing these threats — not artificially increasing hatchling numbers.
This is the crux of the hatchery debate. Hatcheries can address egg poaching by collecting and protecting eggs. Whether they actually improve population outcomes depends entirely on what happens after hatching.
The two main Gili Trawangan hatcheries follow a similar model. Eggs are collected from local beaches (and sometimes purchased from fishermen who would otherwise consume them), incubated in protected sand boxes, and the hatchlings are placed into freshwater or saltwater tanks for a holding period that varies from weeks to months. Tourists view the tanks, donate, and sometimes participate in release events.
The headline conservation argument from the hatcheries is that egg collection from poaching pressure and post-hatch survival improvements (because hatchlings released at larger size avoid more predators) result in net population gains.
The marine biology critique pushes back on several points.
Holding period and tank conditions. Hatchlings held in tanks for weeks or months experience conditions very different from natural ocean life. Crowding, freshwater contamination, suboptimal nutrition, and exposure to bacteria can produce weakened animals that fare worse on release than smaller animals released straight from the nest. The "head-start" model is debated in sea turtle conservation literature and is not currently considered best practice.
Imprinting and orientation. Hatchlings rely on natal-beach imprinting to return as adult females to lay their own eggs. Hatchlings raised in tanks for extended periods may have disrupted imprinting, reducing future reproductive success — though this is hard to measure.
Release survival. Long-term tracking of head-started hatchlings is difficult and rare. The few studies that exist suggest survival rates of head-started turtles are not significantly better than wild hatchlings, and may be worse depending on holding conditions.
Genetic mixing. Eggs from multiple beaches incubated together and hatchlings released into one location can mix genetic populations that would otherwise be reproductively isolated.
Income vs conservation. Hatcheries generate significant tourist income. The temptation to maximise visible "cute baby turtle" displays — which means longer holding periods — runs counter to optimal conservation practice.
None of these points say "hatcheries are bad." They say "the conservation case for the current Gili model is weaker than the marketing suggests, and depends heavily on operational details that tourists cannot easily verify."
A tourist who visits a hatchery, listens to the conservation story, donates a small amount, and walks away more aware of sea turtle conservation issues than before is probably a net positive for the species. The hatchery model has flaws, but it does generate awareness, public engagement, and some revenue for conservation work.
If you visit, ask questions. How long are hatchlings held? What's the freshwater vs saltwater protocol? Where are eggs sourced from? What's the release survival data? Operators who answer specifically and confidently are usually the ones doing better work. Operators who deflect or repeat brochure language are usually not.
The cleanest conservation engagement on the Gilis is not the hatcheries — it's snorkeling or diving with wild adult turtles in their natural habitat, which costs nothing extra beyond a regular dive or snorkel trip. Adult green turtles are common around all three Gilis, with high probability of sightings on standard snorkeling routes.
Wild turtle encounters do not require captive holding, do not generate questionable conservation outcomes, and produce a more meaningful experience than tank viewing. Etiquette matters: do not touch turtles, do not chase them, maintain distance, do not block them from surfacing.
Several conservation organisations on Lombok focus on threat reduction (anti-poaching patrols, fishing gear modification, plastic cleanup) rather than hatcheries. Donating to these has a clearer conservation case than donating to hatcheries.
Not all hatcheries are equal. The genuinely well-run ones share certain practices:
If a Gili hatchery checks most of these boxes, it is doing serious work. If it cannot answer questions about most of them, it is more tourist attraction than conservation operation.
If you have one afternoon and are choosing between visiting a hatchery and going on a snorkeling boat trip, choose the snorkeling. Wild turtle encounters are more impactful, more memorable, and conservation-positive without the controversy.
If you visit a hatchery, treat the donation as funding general conservation awareness work, not as an investment in measurable population outcomes. Limit your visit to 15–20 minutes — the educational content is brief and the longer you stay, the more the operation looks like a roadside attraction.
If you want to actively support sea turtle conservation in Lombok, donate to organisations like Indonesian Sea Turtle Foundation or Yayasan Kelestarian Penyu Indonesia rather than the on-island hatcheries. Their work on poaching enforcement, fisheries gear, and community education has clearer conservation returns.
Wild adult turtle encounters around the Gilis are common enough that most snorkelers see at least one per outing during a typical trip. Behaving correctly during these encounters is a meaningful piece of conservation practice that many tourists get wrong without realising.
Do not touch. Ever. Touching causes stress hormone responses, damages the protective mucus layer on their shells, and can transmit pathogens between humans and turtles. The temptation to "just gently brush" a turtle's shell is strong; resist it absolutely.
Do not chase. A turtle swimming away from you is communicating discomfort. Following, herding, or trying to "get a closer look" forces the turtle to expend energy fleeing instead of feeding or resting. This is particularly harmful when the turtle is breathing at the surface — chasing can drive the turtle back down before it has fully replenished oxygen.
Maintain distance. A 3-meter buffer zone is widely considered the minimum responsible distance. If the turtle approaches you (which they sometimes do out of curiosity, especially at frequently dived sites), let it; if you approach the turtle, stop at the buffer distance.
Do not block the surface. Turtles need to breathe air. Floating between a turtle and the surface, even unintentionally, prevents normal breathing patterns and is a serious stress.
Use no-flash photography only. Underwater flash photography stresses many marine animals including turtles. Use natural light, white balance correction, and post-processing instead of strobes.
Boat captains and snorkel guides who actively enforce these rules with their groups are doing real conservation work. Operators who let groups crowd or chase turtles for "better photos" are causing measurable harm. Choose operators based on this behaviour.
A piece of context that explains some of the dynamics: the hatcheries on the Gilis are commercial operations that depend on tourist visits and donations for revenue. Some operators are conservation-motivated individuals running their hatchery as an extension of their values; others are entrepreneurs running it as a tourist attraction with conservation framing.
This economic reality creates pressure toward practices that maximise visible "cute baby turtle" displays — the things tourists pay to see — even when those practices conflict with optimal conservation outcomes. Long holding periods produce more tourist appeal than immediate releases. Visible baby turtles in tanks generate more donations than empty tanks.
This doesn't mean hatcheries are scams or that the operators are dishonest. It means the economic model has built-in pressures that visitors should understand. Asking detailed questions about operational practice — and noticing whether the answers are specific or evasive — helps separate the conservation-genuine operations from the tourist-attraction operations.
Sea turtle conservation in Indonesia is a serious challenge with serious organisations doing serious work. The Gili hatcheries occupy a contested middle ground — better than nothing, weaker than they claim, dependent on operational details. Engage thoughtfully. Do not assume that paying an entrance fee at a tank is meaningful conservation. Do not assume that the hatcheries are scams either. The reality, as usual, is more complicated than either narrative.