Beberapa aspek biologi (morfometrik, reproduksi dan jenis makanan) Ikan Tongkol Abu (Thunnus tonggol Bleeker, 1851) di Perairan Laut Jawa yang didaratkan di Pangkalan Pendaratan Ikan (PPI) Karangsong, Indramayu, Jawa Barat = Some biological aspects (morphometric, reproduction and foods) of Longtail Tuna (Thunnus tonggol Bleeker, 1851) in Java Sea at Landing Fish Centre, Karangsong, Indramayu, West Java