正海生物：上半年净利润4648.57万元

Group 1 - The core viewpoint of the article is that Zhenghai Bio reported a decline in both revenue and net profit for the first half of 2025 compared to the same period in the previous year [2] - The company's operating revenue for the first half of 2025 was 188 million yuan, representing a year-on-year decrease of 5.14% [2] - The net profit attributable to the parent company was 46.49 million yuan, showing a significant year-on-year decline of 45.97% [2]