The Black Molly fish is known for its distinctive appearance, with a dark body and a strikingly large and rounded belly when it is pregnant. The scales of the fish are shiny and metallic, with a black or dark gray coloration that is accented by highlights of silver or gold. As the fish approaches pregnancy, the belly will become noticeably larger and more pronounced, with a protruding shape that is unmistakable. The eyes of the Black Molly are large and round, with a bright and alert appearance that adds to the fish’s distinctive character. Overall, the physical appearance of a pregnant Black Molly is both eye-catching and fascinating to observe.