Estimation of Water Carrying Capacity for Floating Net Cage Cultivation Activities in Pekalongan Coastal Waters

Abstract

Floating cage fish farming is an aquaculture activity that is mostly carried out on the coast of Pekalongan. The purpose of this study was to estimate the carrying capacity of Pekalongan coastal waters as a floating net cage aquaculture activity zone. The research method used is descriptive qualitative and quantitative descriptive by calculating the indicators of Trophic Status Index (TSI), phosphorus, feed conversion ratio, and the carrying capacity level of the waters. The results showed that chlorophyll-a values ranged from 6.44-8.24 ꭒg/L, total phosphorus 12.44-14.80 ꭒg/L, feed conversion ratio 1.10-1.25, TSI (Trophic Status Index) values 48.2-54.6, harvested biomass 120-157 kg/ floating net cages (KJA). The carrying capacity of the waters for KJA cultivation is 145.43 tons of fish/year, and the number of existing KJA for cultivation is 110 KJA. The conclusion from the results of this study is that the carrying capacity on Pekalongan coastal waters when used as a floating net cage aquaculture activity zone is estimated to be able to accommodate approximately 145.43 tons of fish/year or the equivalent of 121 KJA. Currently, there are 110 KJA plots in the Jeruksari coastal waters, which means that the maximum carrying capacity of the waters that can be used for KJA cultivation is 11 KJA.

Feasibility Study Area and Dissolved Oxygen Carrying Capacity of Silvofishery Pond on the Coastal Area

“…The carrying capacity level and pond potential is estimated by comparing the DO value and the water volume average following equation by Mardiana et al, (2023):…”

“…Note: D is the pond volume (m 3 ); (Vh-Vi) is the water exchange volume; Vh is the initial water volume (m 3 ); and t is the duration of the water exchange. After the pond water volume has been estimated, the next step is to determine of oxygen carrying capacity based on the inflow of water and the minimum DO concentration in the pond using formula by Mardiana et al (2023):…”

“…Information on carrying capacity is crucial for determining the level of input in fish farming production (Santanwat et al, 2023). Carrying capacity is also necessary to avoid excessive accumulation of waste in the surrounding environment of the pond (Mardiana et al, 2023). Silvofishery ponds with the utilization of mangrove ecosystems are well-suited for sustainable cultivation concepts with controlled carrying capacity (Ouyang and Guo, 2016).…”

“…As ecological parameters, water and soil quality in cultivation ponds are essential for assessing land status . Furthermore, the carrying capacity of cultivation is highly determined by the land's productivity level (He et al, 2020;Mardiana et al, 2023). In other words, the correlation between cultivation productivity and the carrying capacity along with the ecological parameters of the water is significant (Lukman et al, 2021;Dong et al, 2021).…”

Dynamic Modelling Analysis on The Effectiveness of Coastal Land Resources for Aquaculture Activities Utilization

“…Coastal areas are natural ecosystems with extraordinary biodiversity [1]. Biodiversity in coastal areas provides extraordinary resource utilization opportunities for development in the future [2]. The interaction between geophysical and geological elements has an impact on the anthropogenic characteristics of dynamic coastal areas [3].…”