Washington, Dec 26 : A new study has determined that global warming might be leading to the birth of too many male fish.
According to a report in Live Science, some experts believe that the gender of many fish is determined by temperature, because temperature-dependent sex determination, or TSD, occurs in many species.
But, a critical analysis of the fish literature by Natalia Ospina-Alvarez and Francesc Piferrer, both of the Marine Science Institute in Barcelona, Spain, casts doubt on that assertion.
The pair point out that fourteen of the twenty diverse fish genera previously reported as having TSD in fact have sex chromosomes, and that it takes unnatural temperatures found only in the laboratory to masculinize their genetic females.