Freshwater Biologist (Limnologist)
🦠Studies life in rivers, lakes and reservoirs: plankton, algae, molluscs. Uses them to judge water quality and predict algal blooms.
Prospects & pay
What the work is like
💼 Job market
🇺🇸 $89.2k a year on average
Biological scientists — US: Census ACS 2020–24 (full-time), BLS projections 2025–35
🇬🇧 £46.5k median a year · 11,000 jobs
Biological scientists — UK: ONS ASHE 2025 (full-time)
🤖 AI & automation
AI identifies plankton under the microscope and spots blooms in satellite images; sampling on the water and expert reports stay with the biologist.
Who it suits
Interests: 🧬 Biology, 🌋 Planet: ocean, climate, geology, 🏕️ Outdoor work, expeditions, 🐾 Animals.
Key strengths: science, attention to detail.
Where to study
- Bachelor's BSc Biology, Freshwater/Marine Biology or Environmental Science
- Master's MSc Freshwater Ecology or Limnology
Key school subjects (A-level / IB / AP): Biology, Chemistry, Geography.
🧗 Biology or environmental science degree, then an MSc in freshwater ecology. Jobs at environment agencies (Environment Agency, EPA), water companies and research institutes.
Universities
🇬🇧 United Kingdom
- University of Cambridge Cambridge · €33.4k–81.1k/yr
IELTS 7.5 (7.0 each); subject test (ESAT, TMUA, LNAT, UCAT), interview; apply by 15 Oct; plus college fee £12–14.5k/yr - University of Oxford Oxford · €43k–72.2k/yr
IELTS 7.5 (7.0 each); subject test (MAT, PAT, TSA, LNAT, UCAT), interview; apply by 15 Oct; medicine takes ≤14 international students/yr - Imperial College London London · €49.1k–52.3k/yr
A-levels/IB or a recognised foundation; IELTS 6.5–7.0; ESAT/TMUA tests; medicine: UCAT + interview, £58.6k/yr
🇺🇸 United States
- Harvard University Cambridge, MA · €54.1k/yr
SAT/ACT required; English test optional; aid for internationals on the same terms (need-blind), full need met - Stanford University Stanford, CA · €58.9k–61.2k/yr
SAT/ACT required; no English test required; need-aware for internationals (aid request affects admission), full need met - Massachusetts Institute of Technology Cambridge, MA · €58k/yr
SAT/ACT required; TOEFL 90+ (100 rec.) / IELTS 7; own application (not Common App); need-blind for internationals, full need met
🇩🇪 Germany
- Heidelberg University Heidelberg · €3k/yr
Non-EU: €1,500 a semester (Baden-Württemberg); German C1 (DSH-2/TestDaF 4x4); medicine: non-EU quota, selection by grades * - LMU Munich Munich · free
No tuition; DSH-2, TestDaF 4 in all parts, telc C1 Hochschule; without it at least B2 to apply; medicine: non-EU quota - University of Freiburg Freiburg · €3k/yr
Non-EU: €1,500 a semester; DSH-2/TestDaF 4x4/telc C1 Hochschule; only Liberal Arts and Sciences in English; medicine: apply to Freiburg
🇳🇱 Netherlands
- Wageningen University & Research Wageningen · €18.3k/yr
Certificate + usually 1 university year; maths and biology/chemistry; IELTS ≈ 6.0–6.5 - Utrecht University Utrecht · €13.4k–17.1k/yr
Certificate + usually 1 university year; IELTS ≈ 6.5; veterinary medicine (225 places) and medicine are numerus fixus, apply by 15 January - University of Groningen Groningen
VWO level by file review; IELTS 6.5 (by programme); €100 fee; numerus fixus by 15 January, others by 1 May, non-EU conditions by 1 July
🇫🇷 France
- Sorbonne University Paris · €200–2.9k/yr
DAP, French B2; medicine via PASS/LAS with selection into year 2; waiver of €2,902 under university criteria - Université Paris Cité Paris · €200–2.9k/yr
DAP, B2; 2026/27 moratorium — non-EU pay €178; medicine/pharmacy via PASS/LAS - Université Paris-Saclay Orsay · €200–2.9k/yr
Licence in French: DAP, B2 (TCF DAP/DELF B2); in 2026/27 non-EU partly exempted, pay €178
🇮🇹 Italy
- University of Padua Padua · €2.8k–3k/yr
12 school years or Foundation Year; B2 in the language of study; non-EU with family abroad pay a fixed €2,790–2,990 - University of Bologna Bologna · €1.2k/yr
English programmes: B2 (some B1), selection by SAT, TOLC-E or CEnT-S; 12 school years. Non-OECD citizens: €1,157 a year - University of Milan Milan · €1.1k–4.3k/yr
12 school years; Italian B2 (English B2 for English programmes); programme tests; income abroad: fixed fee by country group
🇪🇸 Spain
- University of Barcelona Barcelona · €1.8k/yr
Homologation + UNEDasiss, PCE for score; many classes in Catalan; non-EU €30/ECTS * - Autonomous University of Madrid Madrid · €6.8k–8.2k/yr
Homologation + UNEDasiss, PCE; non-EU pay ≈ 7× more (e.g. €6,823 vs €1,015) - Autonomous University of Barcelona Bellaterra · €1.8k/yr
Homologation + UNEDasiss, PCE for score; some classes in Catalan; non-EU €30/ECTS *
🇨🇿 Czech Republic
- Charles University Prague · free
Free in Czech (Czech ≈B2 + exams, ÚJOP course); English programmes €40–30,620/yr - Masaryk University Brno · €0–16k/yr
Free in Czech; English €2,700–7,500/yr (Informatics €4,500), Medicine CZK 380,000; Czech ≈B2 + entrance exams - University of South Bohemia České Budějovice · free
Free in Czech: Czech ≈B2 + entrance exams, certificate nostrification *
Things to know
🌊 Working on or under water🏔️ Long stints far from home
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