蛙养殖技术：幼蛙和成蛙的常见疾病防治Common diseases & prevention in juvenile and adult frogs

爪蟾养殖中坚持"预防为主、防重于治"的原则。严格控制水质指标（pH 6.8–7.5，氨氮 ≤0.2 mg/L），新进苗种执行 3–7 天隔离观察，养殖工具专池专用，可显著降低发病率。Xenopus husbandry follows a "prevention first" principle. Stringent water quality control (pH 6.8–7.5, ammonia ≤0.2 mg/L), 3–7 day quarantine for new stock, and dedicated equipment per tank markedly reduce disease incidence.

一、细菌性疾病I. Bacterial diseases

1. 红腿病（假单胞菌感染）Red-leg disease (Pseudomonas infection)

病因与症状：养殖中致死率极高的急性传染病，多发于冬季低温期、水质恶化及放养密度过大时。初期腹部及腿部肌肉出现点状充血，严重时全身肌肉红肿，伴随内脏（肺、脾、肾、肠）扩散性感染。病蛙瘫软无力、行动迟缓、拒食，急性期通常 3–4 天内致死。Aetiology & signs: Acute highly lethal infection, most common during winter cold periods, deteriorating water quality and overcrowding. Early signs: punctate congestion of abdomen and legs; severe cases show systemic muscle inflammation with spread to lungs, spleen, kidney and gut. Affected frogs are flaccid, lethargic and anorexic; acute cases die within 3–4 days.

• 水体消毒：全池泼洒二氧化氯 0.3–0.5 mg/L，彻底消毒。Water disinfection: broadcast ClO₂ 0.3–0.5 mg/L throughout the tank.
• 药浴：隔离病蛙，用 25% 葡萄糖生理盐水（冷开水 100 mL + 食盐 0.9 g + 葡萄糖 25 g）配伍青霉素（40 万单位/100 mL）药浴，每日 2 次，每次 3–5 min。Bath treatment: isolate and bathe in 25% glucose saline (100 mL boiled water + 0.9 g NaCl + 25 g glucose) with penicillin (400,000 IU/100 mL), twice daily, 3–5 min per session.
• 重症注射：按体重肌注庆大霉素 4 万单位/kg。Severe cases: intramuscular gentamicin 40,000 IU/kg body weight.
• 免疫预防：苗种期引入嗜水气单胞灭活疫苗免疫。Immunoprophylaxis: inactivated Aeromonas hydrophila vaccine at juvenile stage.

2. 肠胃炎与腹胀气Enteritis & bloat

病因与症状：多发于春、夏及夏秋交替季节，主要由饵料腐败变质或水质底质恶化引发。肠胃炎型患蛙躁动不安、四处钻泥，后期静卧水池边，对外界刺激反应迟钝，彻底拒食。胀气型腹部异常膨大，下眼睑由透明转为乳白色，解剖可见肝肾肿大出血及胃肠壁发炎。Aetiology & signs: Common in spring, summer and autumn transitions; caused by spoiled feed or deteriorating water/substrate. Enteritis frogs are restless, burrow erratically, then become lethargic, lying at tank edges with complete anorexia. Bloated frogs have abnormally distended abdomens and opaque lower eyelids; necropsy reveals hepatomegaly, haemorrhagic kidneys and gastroenteritis.

• 立即停喂变质饵料，全池泼洒漂白粉 1–2 mg/L 消毒。Immediately remove spoiled feed; broadcast bleaching powder 1–2 mg/L.
• 内服：每千克饲料拌入酵母片 2 片或强力霉素 0.6 g，连续投喂 5–7 天。Oral treatment: mix 2 yeast tablets or 0.6 g doxycycline per kg feed; administer for 5–7 consecutive days.
• 微生态恢复：治愈后 2 天全池泼洒石灰水调至弱碱性，再隔 2 天补充水产专用益生菌重塑微生态。Microbiome recovery: 2 days post-recovery, apply lime water to mildly alkaline; 2 days later, introduce aquaculture probiotics to restore microbial balance.

3. 口唇红肿与白点病Mouth swelling & white-spot disease

症状：口唇充血红肿；或头部、背部皮肤出现白点，扩展成条状腐烂，严重时露出白骨。多因密度过大、体表机械损伤继发感染引起。Signs: Swollen, congested lips; or white spots on head/dorsum expanding to linear necrosis, exposing bone in severe cases. Usually secondary infection from physical injury due to overcrowding.

• 隔离病蛙，0.5% 盐水药浴；患处直接涂抹碘伏稀释液（1:10）或金霉素眼膏。Isolate; 0.5% NaCl bath; apply diluted iodophor (1:10) or chlortetracycline ointment directly to lesions.
• 内服：100–200 g 病蛙每只口饲磺胺嘧啶片 125 mg + 复合维生素颗粒，连用 6 天。Oral: 100–200 g frogs — sulfadiazine 125 mg + multivitamin per animal, for 6 consecutive days.

4. 烂腿病与肿腿病Leg rot & leg oedema

症状：趾尖发炎腐烂，逐渐向上蔓延至大腿甚至暴露骨骼；或后肢整体肿大呈瘤状，病蛙因负重无法活动，消瘦致死。Signs: Inflammation and necrosis starting at toe tips, spreading proximally to the thigh and sometimes exposing bone; or generalised limb oedema leaving frogs immobile and progressively emaciated.

• 水池彻底生石灰清池消毒。Thoroughly disinfect tank with quicklime.
• 患肢浸泡于高锰酸钾溶液（2–30 mg/L）中 15 min，每日 1 次，连用 3 天。Soak affected limbs in KMnO₄ (2–30 mg/L) for 15 min once daily for 3 days.
• 抗菌：每日 2 次内服四环素（每次半片，连用 2 天），或单次肌注青霉素 40 万单位。Antibiotic: oral tetracycline (½ tablet twice daily for 2 days), or single IM penicillin 400,000 IU.

二、真菌与寄生虫疾病II. Fungal & parasitic diseases

1. 水霉病（肤霉病）Saprolegniasis (water mould)

症状：水温较低或体表有外伤时易发。霉菌丝侵入伤口，患处长出棉絮状白毛，病体游动迟缓，逐渐衰竭死亡。Signs: Predisposed by low water temperature or skin injuries. Fungal hyphae invade wounds, producing cotton-like white growths. Affected animals become sluggish and progressively debilitated.

• 捞出病蛙，患处直接涂抹 10% 紫药水。Remove affected animals; apply 10% gentian violet directly to lesions.
• 高锰酸钾溶液（5 mg/L）浸泡 30 min，连续处理数次。KMnO₄ bath (5 mg/L) for 30 min; repeat several times.
• 严禁使用孔雀石绿及同类违禁药物。Strictly prohibited: malachite green and similar banned substances.

2. 体表与肠道寄生虫（车轮虫、斜管虫等）Surface & intestinal parasites (Trichodina, Chilodonella, etc.)

症状：寄生于体表或鳃部引起黏膜发白、组织溃烂、呼吸困难；寄生于肠道导致极度消瘦、营养不良。Signs: Surface/gill infestation causes mucosal pallor, ulceration and dyspnoea; intestinal parasites lead to severe cachexia and malnutrition.

• 体表驱虫：硫酸铜与硫酸亚铁合剂（5:2）0.7 mg/L 浸泡 20–30 min；或全池泼洒敌百虫 0.5 mg/L。External parasites: copper sulphate–ferrous sulphate (5:2) at 0.7 mg/L for 20–30 min; or broadcast trichlorfon 0.5 mg/L.
• 肠道驱虫：大蒜素粉拌料（1–2%）连续投喂，广谱抑菌驱虫，替代禁用药。Intestinal parasites: feed allicin powder (1–2% in feed) continuously; provides broad-spectrum antimicrobial and antiparasitic activity as a compliant alternative to restricted compounds.

三、环境与营养性疾病III. Environmental & nutritional disorders

1. 气泡病Gas-bubble disease

病因：光照过强、水生植物光合作用剧烈，水体气体过饱和。蝌蚪或幼蛙误吸气泡后腹部膨胀，仰浮于水面，肠道内充满气体。Cause: Intense illumination and vigorous aquatic plant photosynthesis cause gas supersaturation. Tadpoles/froglets ingest bubbles, leading to abdominal distension, dorsal floating and intestinal gas accumulation.

• 将病体转移至清新水体中暂养 1–2 天，完全停止投喂，体内气体分压自然平衡后排出。Transfer to fresh, gas-normal water for 1–2 days; withhold all feed to allow gas pressure equilibration and expulsion.
• 日常控制水体肥度及水草密度，避免强光直射。Routinely control water eutrophication and aquatic plant density; avoid direct strong illumination.

2. 烂皮病（维生素 A 缺乏症）Skin necrosis (vitamin A deficiency)

症状：因饲料营养单一、长期缺乏维生素 A 引发。皮肤失去光泽，出现白色花纹后大面积脱落；瞳孔出现粒状突出，变白甚至失明；蝌蚪期常伴随体腔积水。Signs: Chronic vitamin A deficiency from monotonous diet. Skin loses lustre, develops white patches then large-area desquamation; pupils granulate, turn white and may cause blindness; tadpoles often show concurrent coelom oedema.

• 隔日补喂新鲜动物肝脏 1 g 或直接滴喂鱼肝油，通常 1 周后表皮开始再生。Supplement every other day with 1 g fresh liver or a dose of fish-liver oil; skin regeneration typically begins within one week.
• 继发细菌感染者配合青霉素药浴。If secondary bacterial infection is present, add penicillin bath treatment.
• 预防：人工配合饲料中添加水产复合维生素（VA ≥5000 IU/kg）。Prevention: ensure compound feed contains aquaculture multi-vitamin with VA ≥5000 IU/kg.

3. 脱肛病Rectal prolapse

症状：多见于成蛙，直肠外露于肛门外约 2 cm，极易引发严重感染，须立即处理。Signs: Mainly in adults — rectal tissue prolapses ~2 cm beyond the cloaca; carries high risk of secondary infection and requires immediate intervention.

• 用消毒液及冷开水洗净外露直肠表面，小心将其塞回泄殖腔内（物理复位）。Clean prolapsed tissue with disinfectant and cooled boiled water; gently return it to the cloaca (manual reduction).
• 放入隔离网箱或光线较暗的容器单独静养，减少弹跳，促进括约肌收缩力恢复。Isolate in a dim, low-stimulation container to restrict jumping and allow sphincter tone to recover.

参考文献References

1. Pessier AP (2002) An overview of amphibian skin disease. Semin Avian Exotic Pet Med 11(3):162–174.
2. Densmore CL & Green DE (2007) Diseases of amphibians. ILAR J 48(3):235–254.
3. Wright KM & Whitaker BR (2001) Amphibian Medicine and Captive Husbandry. Krieger Publishing.