Abstract
Sikka regency waters including fishery management with a high utilization status so that the necessary stages of an intensive monitoring and research potential of fish resources. This study aimed to obtain the estimated value of stock biomass and density of fish resources with the acoustic method. Quantitative data obtained will be a source of current information on the state of fish resources in the Sikka regency waters, Indonesia. The research was conducted in May 2015. Acoustic data retrieval, using instruments CruzPro fish finder PcFF-80 with sound velocity of 1516 m / s, power 2560 Watt, and method in survey acoustic use hydroacoustic long transect. The horizontal distribution shows a fluctuation striking at research location has the highest salinity levels in the range of 29.3-29.8 psu. Total biomass of fish in this study showed more the number is at a depth of 11-20 m that is 2,008 tons/km and at a depth of 1-10 m have the total fish biomass is 12.33 tons/km, single detection is done using a single target hydroacoustic show more dominance at a depth of 11-20 m in Sikka regency waters, MTB, Indonesia in May 2015. Number of data from results obtained by looking at the relationship between the number of the data with the total biomass in 1-10 m depth has equation Y = 0.0967x + 0.0486 with R2 is 0.0464 (4%) , while at a depth of 11-20 m has a regression equation is Y = 0.0003x + 0041 with the R2 is 0.0091 (0.9%). Variations in the data or the detection of single targets have variations over the data that is at a depth of 11-20 m with the lowest regression is 0.9%.Keywords: Hydroacoustic, Salinity, Biomass, Stock estimation, Sikka regency waters.
Highlights
Quantitative estimation of the size of fish populations is needed in the development and management of fish resources
Fish stock estimation of biomass results obtained at a depth of 11-20 meters has a spatial distribution that is more than the depth of 1-10 meters (Figure 5b), these results can be seen in (Figure 5a) in the 3D spatial distribution of fish at the depth of 1-10 meters, with the highest distribution is 0 to 50, the spatial distribution of the most prevalent is 51-100, and distribution of at least the biomass is 201-310
The total biomass of fish in this study showed more the number is at a depth of 11-20 m that is 2,008 tons/Km and at a depth of 1-10 m have the total fish biomass is 12.33 tons/ km with a total different single target detection, the results obtained are the actual results of the tool hydroacoustic a single beam and do not use the fishing gear for example aids gillnet is not the same with other research (Mehner and Schulz, 2002, Patterson et al, 2001)
Summary
Quantitative estimation of the size of fish populations is needed in the development and management of fish resources. Sikka regency waters have significance for the business activities of fisheries which exploit small pelagic fish resources. Despite constant progress in understanding the complex processes involved in the variability of pelagic stock abundance, especially at short and medium time scales, our ability to predict abundance and catches are limited, which in turn limits our capacity to properly manage the fisheries and ensure sustainable exploitation. Individual foraging success is reduced due to local depletion of food by fellow group members (Folt, 1987). Another potential cost of compact schools includes the energy expended in maintaining position within the echo processing (Lubis et al, 2016a)
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