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Length-weight relationship study of narrow-barred spanish mackerel (Scomberomorus commerson) from Semarang waters was commenced in October-November 2014. The result showed that the fish growth at both the months of October and November 2014 was a negative allometric growth. There was uncertainty to answer the low value for b component during November although at this month was a peak of the fish catching at Java Sea. Due to small fish landed, it indicated that narrow-barred Spanish mackerel of Semarang waters were not proper to be caught. Studi hubungan panjang-berat ikan tenggiri (Scomberomorus commerson) dari perairan Semarang sudah dilakukan selama bulan Oktober dan November 2014. Hasil penelitian menunjukkan bahwa pertumbuhan ikan tenggiri selama bulan Oktober maupun November 2014 adalah bersifat allometrik negative. Tidak diketahui dengan pasti penyebab kecilnya nilai b terutama pada bulan November, meskipun pada periode tersebut merupakan salah satu puncak musim penangkapan ikan tenggiri di Laut Jawa. Kecilnya ukuran ikan yang didaratkan, menunjukkan bahwa ukuran ikan tenggiri di perairan Semarang belum layak tangkap.