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"El" is a form of "el", a definite article which is often translated as "the". "Pez" is a noun which is often translated as "fish". Learn more about the difference between "pez" and "el" below.
el pez(
pehs
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
2. (material)
el(
ehl
)A definite article is a word that identifies a noun as specific or known to the speaker (e.g., the girl).