Correlation between Chlorophyll-a Concentration and Carbohydrate Content of Gracilaria sp in Transition Season 2 and West Season in the Silvofishery Area of the North Coast of Central Java

Abstrak

The North Coast of Central Java has potential natural resources that can be developed, such as the cultivation of Gracilaria sp seaweed. in the silvofishery area either in monoculture or polyculture together with other biota cultivars. Different environmental characteristics in each silvofishery area with different seasons and research locations can influence the concentration of chlorophyll-a pigment Gracilaria sp. as well as the resulting carbohydrate content. The aim of this research is to determine the concentration of chlorophyll-a and carbohydrate content in Gracilaria sp., and to determine the relationship between these two parameters using a spatial approach (St 1: Brebes, St 2: Tegal, St 3: Pemalang, St 4: Pekalongan) and a temporal (transition season 2 and west season). Sampling Gracilaria sp. purposive sampling. Analysis of chlorophyll-a concentration using a spectrophotometer test and carbohydrate content using by difference. To determine the correlation between the two research parameters, the Pearson correlation test was used. The results showed that the chlorophyll-a concentration in transition season 2 ranged from 1,801-2,320 μg/mL with the highest concentration at St 1=2,320 μg/mL, while for the west season it ranged from 1,420-2,685 μg/mL with the highest concentration at St 1=2,685 μg /mL. The carbohydrate content of transition season 2 ranges from 37.088-57.135% with the highest content of St 3 (57.135%), while for the western season it ranges from 75.993-83.796% with the highest content of St 3 (83.796%). So it can be concluded that the relationship between chlorophyll-a concentration and carbohydrate content in transition season 2 is weak (r=-0.250; sig=0.750) and in the west season is strong (r=-0.846; sig=0.164). So it can be concluded that the relationship between chlorophyll-a and carbohydrate content is inversely proportional, that is, when the chlorophyll-a concentration is low, the carbohydrate content is low, and vice versa.