Long story for those who are partient:
First of all, a Chinese character is more heavy-weight than an English alphabet. For example, there is a Chinese character representing "hand", another one representing "bag." However, many English words can be repersented in Chinese by combining the characters. For example, to describe hand bag, you literally put the character "hand" and "bag" side-by-side. The formation of name of different fish spices is more like the swordfish, in the sense the name usually follows the pattern of one character (of some descriptive or arbitrary) with the character "fish." So when you come across with a fish you don't recognize, you could guess it refers to some sort of fish.
So the comparison with English alphabet is not exactly an apple-to-apple comparison. The number of characters is much more than the 26 alphabeters but signficantly less than the total number of English words. New characters keep coming out from time to time (like how English words come out.) .
Another complication is that modern China uses what's called simplified characters (versus the "traditional" characters used in pre-communist China, Hong Kong, and Taiwan). In short, multiple traditional characters are mapped to one single, simplified character (in terms of strokes). So the number of simplified characters is less.
The actual number for the impatient:
For traditional characters:
- A pretty modern comprehensive Chinese dictionary has 49,888 characters (Zhongwen Da Cidian (Great Dictionary of the Chinese Language), 1971).
- A mainstream traditional character set used in Internet, Big5, has about 13,000 characters. It is a good approximation of the need in a comprehensive-typical usage.
For simplified characters:
- A mainstream simplied character set used in Internet, GB 18030, has about 6502 characters. It is a good approximation of the need in a comprehensive-typical usage.
For typical usage:
- Most estimates are that a person needs to only master about 3000 - 4000 characters to be able to communicate effectively in a wide-variety of settings, e.g., reading the equivalent of USA Today and to some extent, TIME. As an analogy, in English, while one can learn the 26 alphabets quickly, one will need signficantly more than 3000-4000 vocabulary before one can read USA Today, and even more for reading TIME.
See the characters in action!
To get a sense of the difference between traditional characters and simplified characters, enjoy the following examples. It also has illustration of variation in scripts, similar to fonts in European characters.