Here are a few options for a WordPress post_tag description for “魚病” (Yúbìng – Fish Disease) in Traditional Chinese, with varying levels of detail and focus:

**Option 1: Concise and Direct**

* **Description:** 關於觀賞魚、食用魚和其他水生生物所患疾病的分類、症狀、治療與預防。 (Guānyú guānshǎngyú, shíyòngyú hé qítā shuǐshēng shēngwù suǒ huàn jíbìng de fēnlèi, zhèngzhuàng, zhìliáo yǔ yùfáng.)
* **Translation:** Categories, symptoms, treatments, and prevention related to diseases affecting ornamental fish, edible fish, and other aquatic creatures.

**Option 2: More Informative**

* **Description:** 探討養殖魚類、觀賞魚常見及罕見疾病，包括細菌感染、寄生蟲、病毒等。提供疾病診斷、治療方法，以及預防措施的相關資訊。 (Tàn tǎo yǎngzhí yú lèi, guānshǎng yú chángjiàn jí hǎnjiàn jíbìng, bāokuò xìjūn gǎn rǎn, jìshēngchóng, bìngdú děng. Tígōng jíbìng zhěnduàn, zhìliáo fāngfǎ, yǐjí yùfáng cuòshī de xiāngguān zīxùn.)
* **Translation:** Exploring common and rare diseases in farmed fish and ornamental fish, including bacterial infections, parasites, viruses, and more. Provides information on disease diagnosis, treatment methods, and preventative measures.

**Option 3: Focused on Practical Application**

* **Description:** 提供有關魚病處理的實用資訊，包括辨識魚病徵兆、選擇合適的治療藥物、改善水質環境以及預防疫情的方法。適合魚類飼養者和相關專業人士參考。 (Tígōng yǒuguān yúbìng chǔlǐ de shíyòng zīxùn, bāokuò biànshì yúbìng zhēngzhào, xuǎnzé héshì de zhìliáo yàowù, gǎishàn shuǐzhí huánjìng yǐjí yùfáng yìqíng de fāngfǎ. Shìhé yú lèi sìyǎngzhě hé xiāngguān zhuānyè rénshì cānkǎo.)
* **Translation:** Practical information on dealing with fish diseases, including identifying disease signs, selecting appropriate medications, improving water quality environments, and methods for preventing outbreaks. Suitable for fish owners and related professionals for reference.

**Option 4: Emphasis on Prevention**
* **Description:** 關注魚類疾病的預防措施，介紹如維持良好水質、適當餵食和隔離患病魚隻等方法，以確保魚隻健康。 (Guānzhù yú lèi jíbìng de yùfáng cuòshī, jièshào rú wéichí liánghǎo shuǐzhí, shìdàng wèi shí hé gélí huàn bìng yú zhī děng fāngfǎ, yǐ quèbǎo yú zhī jiànkāng.)
* **Translation:** Focuses on preventative measures for fish diseases, introducing methods such as maintaining good water quality, providing proper feeding, and isolating sick fish to ensure fish health.

**Which option should you choose?**

* **Consider your blog’s audience:** Are they hobbyists, professionals, or a mix?
* **Consider your content:** What topics do you typically cover under this tag?
* **Prioritize clarity and relevance:** Make sure the description accurately reflects the posts categorized under this tag.

When adding the description in WordPress, you can usually find the field by editing the tag itself (go to Posts -> Tags in your admin panel). Choose the description that best suits your needs and remember that you can always edit it later.