100+ Free ACZM Zoological Medicine Practice Questions

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Which external fish structure is the PRIMARY site of gas exchange, osmoregulation, and ammonia excretion?

Pseudobranch

Swim bladder

Gill lamellae

Operculum

to track

2026 Statistics

Key Facts: ACZM Zoological Medicine Exam

100

FREE Practice Questions

Curated to the ACZM 2026 content outline

~21%

Avian Medicine Weight

Largest single domain on 2026 ACZM content outline

~$1,500-$2,500

2026 Exam Fee

ACZM Certifying Examination (verify current schedule)

3 yr

Required Residency

ACZM-approved residency minimum

Publication Required

First-author peer-reviewed publication prerequisite

~40-60%

First-Time Pass Rate

ACZM (one of the most challenging veterinary specialty exams)

The ACZM Zoological Medicine Certifying Exam is a multi-day written specialty certification examination from the American College of Zoological Medicine. Content spans avian (~21%), aquatic (~20%), reptile/amphibian (~17%), zoo/wildlife (~15%), small mammal (~13%), regulations (~6%), conservation (~4%), and husbandry/nutrition (~4%). Examination fee is approximately $1,500-$2,500; requires an ACZM-approved residency (3 years) plus a first-author peer-reviewed publication and credential approval by the ACZM Credentials Committee.

Sample ACZM Zoological Medicine Practice Questions

Try these sample questions to test your ACZM Zoological Medicine exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which external fish structure is the PRIMARY site of gas exchange, osmoregulation, and ammonia excretion?

A.Pseudobranch

B.Swim bladder

C.Gill lamellae

D.Operculum

Explanation: Gill lamellae are the functional units of gas exchange. They also excrete ~80-90% of nitrogenous waste as ammonia (NH3) and serve as the primary site of ionoregulation via chloride cells. The swim bladder is for buoyancy, and the operculum is the protective cover over the gills.

2A koi pond has elevated ammonia (NH3) at 2.0 mg/L. Which water parameter will MOST increase ammonia toxicity to the fish?

A.Low pH (6.5)

B.High pH (9.0) and elevated temperature

C.High dissolved oxygen

D.Low water hardness only

Explanation: Un-ionized ammonia (NH3) is the toxic form and predominates at higher pH and higher temperature. At low pH, ammonia shifts to the less-toxic ammonium ion (NH4+). Managing ammonia toxicity involves lowering pH or performing water changes while addressing the cause (overfeeding, insufficient biofilter).

3Ichthyophthirius multifiliis (white spot disease) in freshwater fish is BEST treated at which life stage?

A.Encysted trophont on the fish

B.Free-swimming theront (infective stage)

C.Trophozoite inside the host epidermis

D.Cyst wall on aquarium substrate

Explanation: Ich has three stages: trophont (feeding, on fish, drug-resistant under epithelium), tomont (encysted on substrate, drug-resistant), and theront (free-swimming infective stage, drug-susceptible). Treatments (formalin, copper, salt, malachite green) target theronts, so courses must span multiple life cycles.

4Koi herpesvirus (KHV, CyHV-3) outbreaks typically occur at what water temperature range?

A.Below 10°C (50°F)

B.16-28°C (61-82°F)

C.Above 35°C (95°F)

D.Only below freezing

Explanation: KHV is most virulent between 16-28°C, with severe mortality (up to 100%) in the 22-27°C window. At temperatures <13°C or >30°C virus replication is suppressed, and survivors become lifelong carriers. KHV is a USDA-reportable disease in the US.

5What is the typical effective anesthetic dose of MS-222 (tricaine methanesulfonate) for fish surgical anesthesia, and why must the water be buffered?

A.50-150 mg/L; buffered with sodium bicarbonate because MS-222 is acidic

B.5 mg/L; buffered with acetic acid

C.500-1000 mg/L; buffered because it is alkaline

D.1 mg/L; no buffering needed

Explanation: MS-222 induces surgical anesthesia at 50-150 mg/L in soft water (higher doses in marine water). Tricaine hydrolyzes to a strongly acidic solution, so sodium bicarbonate is added (usually 2:1 bicarbonate:MS-222) to buffer to the original water pH and avoid acid-stress. MS-222 has a 21-day US withdrawal time for food fish.

6According to the 2020 AVMA Guidelines for the Euthanasia of Animals, which step is REQUIRED to confirm death in finfish after immersion in a euthanasia solution?

A.Opercular movement cessation for 30 seconds is sufficient

B.A secondary physical method such as decerebration (pithing) or exsanguination

C.Observation for 5 minutes of no movement

D.Freezing immediately without confirmation

Explanation: Per AVMA 2020, immersion agents alone (MS-222 overdose, eugenol) are considered acceptable but must be followed by a secondary physical method — most commonly decerebration (pithing), cervical transection, or exsanguination — because fish can recover after prolonged immersion and opercular cessation.

7A pond koi is noted to have cotton-like white tufts on its fins and skin. Microscopy of a skin scrape shows nonseptate, branching hyphae. What is the MOST likely diagnosis?

A.Columnaris (Flavobacterium columnare)

B.Saprolegnia (water mold)

C.Ich

D.Chytridiomycosis

Explanation: Saprolegnia is an oomycete water mold that appears as cotton-tuft infections on skin, fins, and eggs, often secondary to prior trauma, low water temperature, or immunosuppression. Nonseptate, branching hyphae are diagnostic. Treatment involves improving water quality, salt, and formalin or hydrogen peroxide.

8In the nitrogen cycle of a recirculating aquaculture system (RAS), which bacterial genus oxidizes nitrite (NO2-) to nitrate (NO3-)?

A.Nitrosomonas

B.Nitrobacter and Nitrospira

C.Pseudomonas

D.Aeromonas

Explanation: Nitrosomonas (and Nitrosospira) oxidize NH3 → NO2-; Nitrobacter and Nitrospira oxidize NO2- → NO3-. Nitrite toxicity causes methemoglobinemia (brown blood disease); nitrate is much less toxic. New systems take 4-6 weeks to cycle a competent biofilter.

9Motile aeromonad septicemia (MAS) in freshwater fish is MOST commonly caused by which pathogen?

A.Aeromonas salmonicida

B.Aeromonas hydrophila

C.Edwardsiella tarda

D.Yersinia ruckeri

Explanation: Aeromonas hydrophila is the classic motile aeromonad responsible for MAS/hemorrhagic septicemia — often opportunistic following stress (poor water quality, handling). Signs include petechiae, fin rot, ulcers, dropsy, and exophthalmia. A. salmonicida (nonmotile) causes furunculosis in salmonids.

10Spring viremia of carp (SVC), viral hemorrhagic septicemia (VHS), and koi herpesvirus (KHV) share which regulatory feature in the United States?

A.All are reportable to USDA APHIS / OIE (WOAH)

B.All are treatable with enrofloxacin

C.Only affect saltwater species

D.None are reportable

Explanation: SVC (rhabdovirus), VHS (novirhabdovirus, USDA-listed as HPAI-equivalent for fish), and KHV are all USDA APHIS and WOAH (formerly OIE) reportable diseases. Suspected cases must be reported and typically result in quarantine and depopulation under federal aquatic animal health programs.

About the ACZM Zoological Medicine Exam

The ACZM Zoological Medicine Certifying Examination validates core knowledge for independent specialty practice across free-ranging and captive non-domestic species. Content spans avian medicine (PBFD circovirus, proventricular dilatation disease, Chlamydia psittaci zoonotic psittacosis, aspergillosis, hemochromatosis, lead/zinc toxicosis, raptor medicine), aquatic animal medicine (MS-222 tricaine methanesulfonate anesthesia buffered with sodium bicarbonate, nitrogen cycle, ich, columnaris, mycobacteriosis, koi herpesvirus, elasmobranch, cetacean morbillivirus, sea turtle fibropapillomatosis), reptile and amphibian medicine (MBD from Ca:P imbalance and inadequate UVB/vitamin D3, inclusion body disease arenavirus, Cryptosporidium serpentis, ophidiomycosis, chytridiomycosis Batrachochytrium dendrobatidis and B. salamandrivorans, ranavirus), zoo and wildlife medicine (chemical immobilization with etorphine/naltrexone, carfentanil, BAM; capture myopathy; CWD in cervids), small mammal (elephant EEHV, rabbit RHDV2, ferret insulinoma, bat white-nose syndrome), regulations (CITES, ESA, MMPA, AWA, Lacey, MBTA, AVMA euthanasia guidelines), conservation (AZA SSP, studbook management), and husbandry/nutrition. Requires an ACZM-approved residency (minimum 3 years) plus a first-author peer-reviewed publication.

Questions

100 scored questions

Time Limit

Multi-day written examination (general, specialty, and essay/practical sections)

Passing Score

Criterion-referenced standard set by ACZM (modified Angoff)

Exam Fee

~$1,500-$2,500 Certifying Examination fee (ACZM 2026 — verify current schedule) (American College of Zoological Medicine (ACZM))

ACZM Zoological Medicine Exam Content Outline

~21%

Avian Medicine

Psittacine beak and feather disease (PBFD — circovirus, beak/feather dystrophy, immunosuppression), proventricular dilatation disease (avian bornavirus), avian chlamydiosis (Chlamydia psittaci — zoonotic psittacosis, atypical pneumonia in humans; doxycycline treatment), aspergillosis (Aspergillus fumigatus — granulomatous air sac disease, itraconazole/voriconazole/amphotericin B), avian influenza HPAI H5N1, Newcastle disease, Pacheco's disease (psittacid herpesvirus), polyomavirus, hemochromatosis in mynahs/toucans/starlings, lead and zinc toxicosis (chelation with CaEDTA/DMSA), raptor bumblefoot, West Nile virus, penguin malaria (Plasmodium relictum — mosquito vector), anesthesia (isoflurane/sevoflurane, air sac cannulation).

~20%

Aquatic Animal Medicine

Fish anesthesia (MS-222/tricaine methanesulfonate — acidic, must be buffered 1:1 with sodium bicarbonate; eugenol; benzocaine), nitrogen cycle (NH3 → NO2- via Nitrosomonas → NO3- via Nitrobacter — new-tank syndrome), water quality parameters (DO, pH, temperature, salinity, alkalinity, hardness), gas bubble disease (supersaturation), ich (Ichthyophthirius multifiliis freshwater, Cryptocaryon irritans marine), columnaris (Flavobacterium columnare), mycobacteriosis (zoonotic — fish handler's disease), koi herpesvirus (KHV), VHS, elasmobranch medicine (urea osmoregulation), cetacean/pinniped medicine (morbillivirus, Brucella ceti/pinnipedialis), sea turtle fibropapillomatosis (chelonid herpesvirus 5), coral disease.

~17%

Reptile & Amphibian Medicine

Metabolic bone disease (MBD — nutritional secondary hyperparathyroidism; inadequate dietary calcium, inverted Ca:P ratio, insufficient UVB 290-315 nm for 7-dehydrocholesterol → vitamin D3 synthesis); inclusion body disease (reptarenavirus in boids — eosinophilic cytoplasmic inclusions); Cryptosporidium serpentis (snakes — gastric, thickened proventriculus) vs C. varanii/saurophilum (lizards — small intestine); ophidiomycosis/snake fungal disease (Ophidiomyces ophidiicola); chytridiomycosis (Batrachochytrium dendrobatidis — global amphibian declines; B. salamandrivorans — salamanders); ranavirus (iridoviridae); chelonian herpesvirus; gout; dystocia; anesthesia (alfaxalone, propofol IV/IO); TSD (temperature-dependent sex determination).

~15%

Zoo & Wildlife Medicine

Chemical immobilization — etorphine (M99) reversed with naltrexone/diprenorphine (handler safety paramount — 10 mg etorphine human-lethal), carfentanil, BAM cocktail (butorphanol/azaperone/medetomidine — reversible with atipamezole + naltrexone), thiafentanil (A3080), ketamine combinations; capture myopathy (exertional rhabdomyolysis — ungulates; prevention with minimal stress, dantrolene for MH-like episodes); chronic wasting disease (CWD — prion disease in cervids, reportable, no effective treatment); field anesthesia; translocation medicine; wildlife rehabilitation; oil spill response; One Health; wildlife forensics.

~13%

Small Mammal & Exotic Mammal Medicine

Elephant endotheliotropic herpesvirus (EEHV — fatal hemorrhagic disease in Asian elephant calves 1-8 yrs; PCR screening, early famciclovir or ganciclovir, plasma/whole-blood transfusion); elephant tuberculosis (Mycobacterium tuberculosis — trunk wash culture/PCR); rabbit (GI stasis, RHDV2 calicivirus, encephalitozoonosis E. cuniculi, pasteurellosis); ferret (insulinoma, hyperadrenocorticism, ECE, ADV, distemper vaccination); rodent medicine; hedgehog wobbly hedgehog syndrome; bat white-nose syndrome (Pseudogymnoascus destructans — hibernating bats); marsupial medicine; great ape cardiomyopathy; primate tuberculosis screening (intradermal TB test).

~6%

Regulations, Law & Welfare

CITES (Appendix I — prohibited commercial trade; II — regulated; III — country-specific), ESA (Endangered Species Act — USFWS/NMFS), MMPA (Marine Mammal Protection Act — NMFS for cetaceans/pinnipeds, USFWS for polar bears/walrus/manatees/sea otters), AWA (USDA-APHIS — regulates warm-blooded animals in exhibition/research/dealers), Lacey Act (interstate trafficking of illegally taken wildlife), MBTA (Migratory Bird Treaty Act), BGEPA (eagles), AVMA Guidelines for the Euthanasia of Animals (acceptable methods by species — barbiturates, captive bolt, CO2 conditions), AZA accreditation standards, OIE/WOAH reportable diseases, IACUC.

~4%

Conservation Medicine & Population Management

AZA Species Survival Plan (SSP) — managed breeding programs for genetic and demographic sustainability; Taxon Advisory Groups (TAG); studbook management; mean kinship, inbreeding coefficient F, effective population size Ne; population viability analysis (PVA — Vortex); assisted reproduction (AI, ET, IVF; GnRH vaccines — deslorelin, GonaCon — for contraception); IUCN reintroduction guidelines; disease risk analysis; ex situ vs in situ conservation; amphibian ark; recovery programs (black-footed ferret + canine distemper vaccination, California condor + lead toxicosis, whooping crane).

~4%

Husbandry, Nutrition & Preventive Medicine

Hindgut (horse, rhino, elephant) vs foregut (ruminant, colobine primate, kangaroo) fermenters; hypervitaminosis A in callitrichids; vitamin E/selenium deficiency (white muscle disease) in ruminants; thiamine (vitamin B1) supplementation in piscivores (thiaminase in fish); iron storage disease (hemosiderosis) in mynahs/toucans/lemurs/rhinos — low-iron diet; quarantine protocols (typically 30 days minimum; negative TB tests in primates/hoofstock); behavioral enrichment; exhibit design with thermal and UVB gradients; ZIMS/Species360 record keeping; fecal parasitology (McMaster, Baermann); necropsy and diagnostic pathology.

How to Pass the ACZM Zoological Medicine Exam

What You Need to Know

Passing score: Criterion-referenced standard set by ACZM (modified Angoff)
Exam length: 100 questions
Time limit: Multi-day written examination (general, specialty, and essay/practical sections)
Exam fee: ~$1,500-$2,500 Certifying Examination fee (ACZM 2026 — verify current schedule)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ACZM Zoological Medicine Study Tips from Top Performers

1MS-222 (tricaine methanesulfonate) is the primary fish anesthetic — but it is ACIDIC and must be BUFFERED 1:1 with sodium bicarbonate to neutralize pH before use, especially in soft-water species. Typical induction 50-200 mg/L; maintenance 50-100 mg/L. Recovery: transfer to fresh, well-oxygenated water. Eugenol (clove oil) is an alternative. Always understand water quality (DO, pH, temperature, ammonia, nitrite, nitrate) — poor water chemistry is the #1 cause of captive fish morbidity.

2Metabolic bone disease (MBD) in reptiles is nutritional secondary hyperparathyroidism from inadequate dietary calcium, inverted Ca:P ratio (feeding crickets/mealworms without gut-loading/dusting), and insufficient UVB (290-315 nm wavelength) required for cutaneous conversion of 7-dehydrocholesterol to previtamin D3 → vitamin D3 → calcitriol (active form). Diagnosis: radiographic osteopenia, pathologic fractures, rubber jaw, hypocalcemia. Treatment: correct diet (Ca:P ~2:1), full-spectrum UVB, calcium gluconate IV/SQ for tetany, calcitonin after calcium normalization.

3EEHV (elephant endotheliotropic herpesvirus) causes a fatal hemorrhagic disease primarily in Asian elephant calves aged 1-8 years. Clinical signs: cyanotic tongue, facial/periorbital edema, lethargy, thrombocytopenia, elevated liver enzymes — progression to death within 24-72 hours without intervention. Surveillance: routine weekly-monthly PCR on trunk and mouth swabs during risk window. Treatment: early antivirals (famciclovir, ganciclovir), plasma/whole-blood transfusion, aggressive supportive care. Early detection and rapid intervention are life-saving.

4Chytridiomycosis from Batrachochytrium dendrobatidis (Bd) is the most devastating wildlife disease ever documented — driving declines and extinctions in >500 amphibian species globally. Bd infects keratinized skin, disrupting osmoregulation and causing fatal electrolyte imbalance. Batrachochytrium salamandrivorans (Bsal) is a newer threat targeting salamanders and newts. Diagnosis: qPCR on skin swabs. Treatment: itraconazole baths (0.01% for 5 min daily x 10-11 days), elevated temperature (>25°C). Biosecurity and quarantine are critical.

5Key zoonotic diseases — high-yield: Chlamydia psittaci (psittacosis — atypical pneumonia, flu-like; treat birds and humans with doxycycline/tetracyclines). Mycobacterium spp. — tuberculosis in primates and elephants (trunk wash culture/PCR; DPP VetTB serology), Mycobacterium marinum (fish handler's disease — granulomatous skin lesions). Brucella ceti/pinnipedialis in marine mammals. Influenza A (HPAI H5N1 in birds/seals). Handler PPE, quarantine, and testing protocols are exam gold.

Frequently Asked Questions

What is the ACZM Zoological Medicine Certifying Examination?

The ACZM Certifying Examination is the board certification examination administered by the American College of Zoological Medicine. It validates breadth of knowledge across zoological medicine including avian, aquatic, reptile and amphibian, zoo and wildlife, small mammal and exotic mammal medicine, and relevant regulations, conservation, and husbandry. Successful candidates become ACZM Diplomates qualified for senior specialty practice at AZA-accredited zoos, aquariums, wildlife agencies, and academic institutions.

Who is eligible to sit for the ACZM exam?

Candidates must hold a DVM, VMD, or equivalent veterinary degree and a valid license, complete an ACZM-approved residency of at least 3 years (or equivalent mentored training), publish a first-author peer-reviewed scientific paper on a zoological medicine topic, and submit a credentials package (case log, letters, documentation) approved by the ACZM Credentials Committee before being allowed to sit.

What is the format of the ACZM exam?

The ACZM Certifying Examination is a multi-day written examination administered annually, typically held in conjunction with the AAZV/ECZM/AZA joint conference. It includes multiple-choice items, short-answer and essay questions, and case/practical sections. Content spans avian, aquatic, reptile/amphibian, mammalian, wildlife, regulations, conservation, and husbandry. Candidates may need to pass each section independently, with section-based retake options.

How much does the 2026 ACZM exam cost?

The 2026 ACZM Certifying Examination fee is approximately $1,500-$2,500 — always verify the current schedule on the ACZM website. Credential review fees are separate. Candidates also fund residency-related travel, conference registration, and preparation materials. After certification, diplomates pay annual dues and MOC (Maintenance of Certification) fees. Retakes require re-registration and additional fees per ACZM policy.

When is the 2026 exam administered?

The ACZM exam is typically offered once per year, often in late summer or fall coinciding with the AAZV/ECZM annual conference. Credentials packages are due well in advance (often by late winter/early spring). Exact 2026 dates, credentials deadlines, and the examination venue should be confirmed on the official ACZM website.

How is the exam scored?

ACZM uses criterion-referenced scoring with passing standards set by subject-matter experts through the modified Angoff method. Candidates must meet section-level passing standards across the exam — some sections may be retaken individually if failed. Pass/fail is determined against a fixed content-expert standard, not curved against other candidates. The ACZM has historically had a challenging first-time pass rate of approximately 40-60%.

What are the highest-yield topics?

High-yield topics include MS-222 fish anesthesia (buffered with sodium bicarbonate), aquarium nitrogen cycle and Nitrosomonas/Nitrobacter, PBFD circovirus and proventricular dilatation disease (bornavirus), Chlamydia psittaci zoonotic psittacosis, aspergillosis in avians, MBD pathophysiology (UVB → vitamin D3 → calcium), Cryptosporidium serpentis, chytridiomycosis (Batrachochytrium dendrobatidis and B. salamandrivorans), EEHV in Asian elephant calves, chronic wasting disease prion, AZA SSP and studbook concepts, CITES/MMPA/AWA jurisdictions, and the AVMA euthanasia guidelines.

How should I study for this exam?

Use a structured 12-24 month plan layered on residency training. Work through Fowler's Zoo and Wild Animal Medicine: Current Therapy and reference volumes, Mader's Reptile and Amphibian Medicine and Surgery, Stoskopf/Smith Fish Medicine, Samour Avian Medicine, Miller and Fowler. Complete AAZV proceedings and peer-reviewed journal articles. Drill regulatory frameworks (CITES/ESA/MMPA/AWA), AVMA euthanasia methods by species, and chemical immobilization protocols. Practice essay writing under timed conditions and complete full-length mock examinations.