ANALISIS TAMPILAN BIOLOGIS IKAN LAYANG (Decapterus sp) HASIL TANGKAPAN PURSE SEINE YANG DIDARATKAN DI PPN PEKALONGAN BIOLOGICAL PERFORMANCE ANALYSIS OF LAYANG (Decapterus spp) FROM THE PURSE SEINE FISHERY AT THE PPN PEKALONGAN LANDING PLACE - Prihartini, Ambar (Magister Manajemen Sumberdaya Pantai UNDIP, 2007)