Identification of chlorophyll compound of Caulerpa racemosa has been carried out using Thin Layer Chromatography (TLC) method. Four compound has been found namely xanthophll, chlorophyll b, chlorophyll a, and phaeophytin. Xanthophyll was identified with the yellow spot on TLC plates which the Rf is 0,46. Chlorophyll b is yellow green spot with Rf is 0,61, the Rf of Chlorophyll a is 0,69 with the color is blue green, whereas phaeophytin is indicated as a black spot with the Rf  0,77. Volpi and UV light sources were used in this study, the volpi light radiation was caused chlorophyll extract degradation about 80,87% at Qy of l 663 nm, and the UV light source caused 72,27%  degradation at l 663 nm.Key words: identification, photodegradation, chlorophyll, Caulerpa racemosa.

Plankton merupakan organisme akuatik yang berperan sebagai dasar dalam rantai makanan dan berperan penting pada ekosistem perairan. Kajian penelitian plankton di perairan Teluk Tanah Merah belum banyak dilakukan sehingga penting untuk dilakukan. penelitian mengeanalisis Kelimpahan Plankton dan Hasil Tangkapan Ikan Pelagis Kecil di Teluk Tanah Merah Kabupaten Jayapura perlu untuk dilakukan. Penelitian menggunakan metode purposive sampling, pengambilan sampel dilakukan pada 9 titik yang di kelompokan kedalam 3 stasiun pengamatan. Analisis data penelitian menggunakan Regresi linier sederhana, APHA dan Shannon – Wiener. Hasil penelitian ditemukan fitoplankton terdiri dari 4 kelas yaitu Bacillariphyceae, Desmidiaceae, Clorophyceae, Cyanophyceae dan 56 genus. Zooplankton terdiri dari 3 kelas yaitu Crustaceae, Ciliatea, Monogononta dan 39 genus. Total kelimpahan fitoplankton 1.149,95 ind/m3, dan zooplankton 1.149,95 ind/m3. Hasil analisis koefisien korelasi diperoleh nilai Sig hitung 0.002 < 0.05 maka dikatakan bahwa terdapat hubungan antara fitoplankton dan zooplankton.Kata Kunci: Kelimpahan; Keanekaragaman;Plankton; Teluk Tanah Merah

Macroalgae or also known as seaweed is a low-level plant that does not have true roots, stems and leaves. The function of the roots, stems and leaves is replaced by the thallus. The purpose of this study was to study the composition of macroalgae pigments (Gelidium corneum) originating from Yakoba Beach, Jayapura City. The method used in this research is an experimental method with pigment analysis using Thin Chromatography and Visible UV Spectrophotometry. The TLC plate test shows the results of identification of the crude extract of the Gelidium corneum pigment. The first three spots are green with an Rf value of 0.24 identified as chlorophyll compounds, the second spot is blue green which is identified as chlorophyll a compound with an Rf value of 0.26 and the third spot was green and yellow identified as chlorophyll b compound with an Rf value of 0.33. The absorbance pattern or wavelength (nm) from the results of the identification of this pigment shows that there are 3 highest peaks identified as chlorophyll pigments where the absorption pattern is at a wavelength of 350-700 nm (Habone, 1987 in Doli et al, 2020).