Study Of Fish Layang Otolith, Decapterus akaadsi, Abe 1958 from Amurang Bay
DOI:
https://doi.org/10.35800/jip.6.2.2018.20630Abstract
Fish otolith is a product of biomineralization in the fish body. In several studies, otolith ha been used to estimate fish age that is a crucial parameter to describe fish population and sustainable management of the fish stock. Otolith occurs in all teleosts, i.e. sagitta, utrikulus, and lagena. Until now, the morphometric characteristics of Decapterus akaadsi, Carangidae, otolith have not been described yet, particularly its microstructure, such as length, width, area, perimeer, and biomineral element.
The otolith of D. akaadsi was studied on sagittal pair samples (left and right) of 29 males and 22 females. The image of these otoliths was assessed using ImageJ application to describe length, width, perimeter, and area of the otolith. Total body length of D.akaadsi samples was found not significant to determine the major descriptor of the otolith. Morphomeric variations of length (2.24 mm) and width (5.26 mm) did not show difference between left otolith and right otolith as between male and female otoliths.
Growth pattern analysis found t cal. > t tab. meaning that males, females, and male-female mixture had allometric growth.
Keyword: scad, Decapterus akaadsi, otolith, morphometric, growth patten.
ABSTRAK
Otolith atau batu telinga ikan dikenal sebagai hasil dari biomineralisasi yang berlangsung dalam tubuh ikan. Pada beberapa studi, otolith digunakan untuk mengestimasi umur ikan serta struktur. Otolith dimiliki oleh semua ikan teleost dengan tiga (3) organ otolith antara lain sagitta, utrikulus dan lagena. Hingga kini jenis Decapterus akaadsi family Carangidae, belum pernah diungkapkan karakteristik morfometrik otolithnya, demikian halnya dengan struktur mikro dari morfologi Panjang, lebar, area, keliling otolith dan elemen biomineralnya.
Otolith ikan layang, Decapterus akaadsi telah ditelaah dari sampel pasangan otolith sagita (kiri dan kanan) sebanyak 29 ikan jantan dan 22 ikan betina. Citra foto otolith ini ditafsirkan dengan piranti ImageJ untuk mendeskripsikan panjang, lebar, perimeter, dan luas otolith Panjang total tubuh Decapterus akaadsi contoh ditemukann non signifikan menentukan descriptor utama otolith. Sementara variasi morfometrik panjang otolith (2,24 mm) dan lebar (5,26 mm) tidak menunjukkan perbedaan baik antara otolith kiri dan otolith kanan, seperti juga antara otolith dari ikan betina dan ikan jantan.
Berdasarkan hasil analisis pola pertumbuhan, uji t terhadap nilai b ikan layang, Decapterus akaadsi jantan memiliki t hit  > t tabe maka dari itu H1 diterima (alometrik) dan betina t hit > t tabel serta gambungkan (jantan-betina) t hit > t tabel   dimana hipotesis H1 diterima (alometrik).
Kata kunci: ikan layang, Decapterus akaadsi, otolith, Karaktistik Morfometrik, Pola Pertumbuhan
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