Paralytic shellfish poisoning (PSP) is caused by toxin saxitonin by

Options

A. Vorticella
B. Ephidicum
C. Gonyaulax
D. Ceratium

Answer

**Step-by-Step Solution:**

1. **Understanding Paralytic Shellfish Poisoning (PSP):**
- Paralytic shellfish poisoning is a condition caused by the consumption of shellfish that have accumulated toxins. The main toxin involved in PSP is called saxitoxin.

2. **Identifying the Source of Saxitoxin:**
- Saxitoxin is produced by certain species of microscopic algae. These algae are often found in marine environments and can accumulate in shellfish, leading to poisoning in humans who consume them.

3. **Analyzing the Options:**
- The options provided are:
- a) Alla
- b) Aphidicum
- c) Gonyaulax
- d) Ceratium

4. **Evaluating Each Option:**
- a) Alla: This is not known to produce saxitoxin, so this option is incorrect.
- b) Aphidicum: This is also not associated with the production of saxitoxin, making this option incorrect.
- c) Gonyaulax: This is a genus of dinoflagellates known to produce saxitoxin, making this option correct.
- d) Ceratium: This genus is not known for producing saxitoxin, so this option is incorrect.

5. **Conclusion:**
- The correct answer is option c) Gonyaulax, as it is the source of the toxin saxitoxin that causes paralytic shellfish poisoning.

6. **Symptoms of PSP:**
- Major symptoms of paralytic shellfish poisoning include tingling of fingers and difficulty in breathing.