PENELITIAN PENDAHULUAN PERKEMBANGAN GAMET DAN FEKUNDITAS IKAN BELANAK (LIZA TADE FORSK) DI PERAIRAN PULAU BAAI BENGKULU

Abstract

Observations of gametogenesis and fecundity of Liza tade Forsk was conducted to find out spawning season in the collected sample in Baai Island waters Bengkulu from the 1^st to 3^rd week of October 2004. Gametogenesis among stages of L. tade Forsk was not sincronous, and development of testis was not so clear compared to development of oosit. Spawning of this species was predicted occur more than once period between the 4^th week of October to the 1^st week of November, however tend partially, because distribution of oosit sizes within ovaries were not significant difference. Fecundity was more affected by total body length than body weight (Thamrin^1,2, F. Azrianto² dan Sukendi²)

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Key words: Liza tade, reproduction, gametogenesis, oosit, testis, fecundity.

PENYUSUNAN ALGORITMA PENDUGA KONSENTRASI CHL-a DARI CITRA KAMERA DIGITAL

ABSTRACT

The study of assesment model on Chl-a was conducted in Aquaculture pond of Fisheries and Marine Science Faculty, Riau University from May to September 2007. Digital Number (DN) of digital camera and in situ data were used to generate the assesment model using regression analysis. The equation of Chl-a concentration was derived from digital camera, i.e. Y= 0.9259X + 0.0024. Y= chl-a concentration and X= (Band 3/(Band1 + Band 2). The formula showed a significant relation between DN of digital camera and Chl-a (r = 0,87) at the level convidence of 95%. The average of Chl-a assesment using the model is 0.25 mg/l. Both of this algorithm was generated to application of hatchery, fish pond and calm waters (Thamrin)