Dataset of physico-chemical water parameters, phytoplankton, flora and fauna in mangrove ecosystem at Sungai Kertih, Terengganu, Malaysia oleh Siti Mariam Muhammad Nor, Maisarah Jaafar, Nik Mohd Shibli Nik Jaafar, Nurul Shahida Redzuan, Wan Bayani Wan Omar, Muhammad Yazid Deraman, Siti Nur Syasya Nadhirah Azli, Nur Adilla Shehrom, 'Ainna Mahyudin, Nor Ain Bahari, Nurul Nadhirah Zulkafli, Nur Faezati Jaafar, Siti Nur Syaza Ma'ad, Mohammad Izuan Mohd Zamri, Azrun Amirudin, Nur Ain Abdullah, Nurulhuda Zakaria