A staff member dissects a grouper fry at a laboratory of Tianjin Leadar Marine Resources Development Co., Ltd in the Binhai New Area modern agriculture industrial park in north China's Tianjin, on March 16, 2023. The industrial park has more than 90 industrial aquacultural enterprises, with an annual breeding of about 18.6 billion fish fry.(Photo: Xinhua)

A staff member tests water quality at a laboratory of Tianjin Leadar Marine Resources Development Co., Ltd in the Binhai New Area modern agriculture industrial park in north China's Tianjin, on March 16, 2023. The industrial park has more than 90 industrial aquacultural enterprises, with an annual breeding of about 18.6 billion fish fry.(Photo: Xinhua)

A staff member checks grouper fry at Tianjin Leadar Marine Resources Development Co., Ltd in the Binhai New Area modern agriculture industrial park in north China's Tianjin, on March 16, 2023. The industrial park has more than 90 industrial aquacultural enterprises, with an annual breeding of about 18.6 billion fish fry.(Photo: Xinhua)

Prawn fry are seen at a hatchery of Tianjin Leadar Marine Resources Development Co., Ltd in the Binhai New Area modern agriculture industrial park in north China's Tianjin, on March 16, 2023. The industrial park has more than 90 industrial aquacultural enterprises, with an annual breeding of about 18.6 billion fish fry.(Photo: Xinhua)