Analisis Spasial Clustering Zona Potensi Ikan Konsumsi Air Tawar di Kabupaten Bogor

<p><em>Data ikan konsumsi air tawar sangat diperlukan untuk mengetahui zona potensi ikan konsumsi air tawar, dengan tingkat potensi tinggi, sedang dan rendah pada 40 Kecamatan yang ada di Kabupaten Bogor, namun data yang diperoleh dari Dinas Perikanan dan Peternakan masih disajikan dalam buku yang menggambarkan peta dan data-data tentang perikanan. Serta untuk mengetahui produksi dari Tahun ke Tahun masih kurang optimal karena hanya disajikan dalam bentuk grafik statistik. Hal ini menyebabkan kesulitan dalam mengetahui zona ikan konsumsi air tawar, yang berpotensi memiliki tingkat potensi tinggi, sedang dan rendah, oleh karena itu diperlukanya </em>suatu peta sebaran<em>, untuk memudahkan dalam melihat peta sebaran zona potensi ikan konsumsi air tawar dengan potensi tinggi, sedang, dan rendah dari Tahun 2018-2019, kedalam bentuk peta menggunakan analisis k-means clustering</em> dengan bahasa pemrograman Rstudio<em>. Hasil penelitian analisis dengan k-means clustering menghasilkan 3 cluster dengan kategori tinggi, sedang dan rendah pada jenis ikan konsumsi air tawar. Hasil dari penelitian ini yaitu peta lokasi sebaran zona potensi ikan konsumsi air tawar di Kabupaten Bogor.</em></p><p> </p><p align="left"><strong>K</strong><strong>a</strong><strong>ta kunci: </strong><em>Analisis Spasial, Potensi Ikan Konsumsi, Metode Clustering, Zona potensi</em></p><p align="center"><strong><em>Abstract</em></strong></p><p><em>Freshwater fish consumption data is very necessary to determine the potential zones of freshwater consumption fish, with high, medium and low potential levels in 40 sub-districts in Bogor Regency, but data obtained from the Department of Fisheries and Livestock are still presented in books that describe maps and </em><em>fishery data</em><em>. And to find out the production from year to year is still not optimal because it is only presented in the form of statistical graphs. This causes difficulties in knowing the zones of freshwater consumption fish, which have the potential to have high, medium and low potential levels</em> <em>a distribution map is needed, to make it easier to see a map of the distribution of </em><em>potential</em><em>l freshwater fish consumption zones with high, medium, and low potential. low from 2018-2019, into map form using k-means clustering analysis</em><em> with Rstudio programming language</em><em>. The results of the analysis with k-means clustering resulted in 3 clusters with high medium and low categories for freshwater consumption fish The results of this study are a map of the distribution of potential zones for freshwater consumption fish in Bogor</em><em>.</em></p><p> </p><p><strong>Keywords</strong>: <em>Spatial Analysis, Potential Fish Consumption, Clustering Method, Potential Zone</em><em></em></p>

Data accuracy in capture fisheries production at Cilacap Ocean Fishing Port

Accurate capture fishery production data at the fishing ports is crucial, especially for planning the development of capture fisheries and fishing ports. This research aims to analyze the mechanism and accuracy in collecting capture fishery data at the fishing port, especially Cilacap Ocean Fishing Port (OFP). The data collection mechanism of capture fishery production is analyzed through a qualitative descriptive method, while the accuracy of the data was analyzed with a comparative quantitative descriptive method. The results showed three steps in the data collection mechanism at Cilacap OFP: data collection, data recapitulation, and data reporting. The values of deviation and accuracy level of the data on capture fishery were 3,4%-62,1% and 37,9%-96,6%, respectively. This result concluded that the data recorded by the enumerator were more accurate than those in the logbook classified as inaccurate.Keywords:CilacapDataFishAccurateFishing Port

Potential for Mesopelagic Fishery Compared to Economy and Fisheries Dynamics in Current Large Scale Danish Pelagic Fishery

Mesopelagic fish species represent a large potentially unexploited resource for the fishing industry and the fish meal, oil, nutraceutical, and pharmaceutical production. However, thorough investigation on ecological sustainability and socio-economic viability are fundamental prerequisites for potential exploitation. The current study explores the economic viability of a potential mesopelagic fishery investigating minimum catch rates, under the assumption of previous assessments of biological sustainability of such exploitation. We analyzed fishery data from the North-East Atlantic fisheries of the Danish large pelagic fleet from 2015 to 2019, by comparing the combined data on fishing dynamics and cost-structures with data from interviews of key pelagic producer organization representatives to develop scenarios of profitability. The results show full year-round fleet occupation with the ongoing fisheries, exposing the need of switching from existing activities, or investing into new vessels for conducting potential mesopelagic fishery. Economic analyses revealed that the minimum revenue to break even (zero profit) by trip varies among métiers between 60,000 and 200,000 euro showing strong positive correlation with vessel sizes. High profitability was discovered for herring, Atlantic mackerel and blue whiting fisheries while low profitability was observed for the Norway pout fishery. Due to the lack of mesopelagic fishery data, different scenarios of profitability were investigated as informed by the pelagic catch sector stakeholder perceptions of prices and costs and compared to current economic dynamics. A high break-even revenue per trip was forecasted given the increased perceived costs for fuel, modifications of gears and on-board processing methods and potential new vessel investments. High profitability may be reached if the catches exceed 220–1,060 tons per trip depending on costs and vessel storage capacity. If the conservation methods are improved from current refrigerated sea water, fishing trips could last longer than 5 days, being the major limiting economic factor for potential mesopelagic fishery. Future investigations on realistic mesopelagic catches, trip durations and spatio-temporal distribution of fisheries in relation to location, resource abundance, fishing rights, storage and conservation methods will be essential to test the robustness of the scenarios proposed in this study, and will in turn benefit of the economic requirements evaluated herein.

Habitat Suitability Modeling for the Feeding Ground of Immature Albacore in the Southern Indian Ocean Using Satellite-Derived Sea Surface Temperature and Chlorophyll Data

In the current study, remotely sensed sea surface ocean temperature (SST) and sea surface chlorophyll (SSC), an indicator of tuna abundance, were used to determine the optimal feeding habitat zone of the southern Indian Ocean (SIO) albacore using a habitat suitability model applied to the 2000–2016 Taiwanese longline fishery data. The analysis showed a stronger correlation between the 2-month lag SSC and standardized catch per unit effort (CPUE) than 0-, 1-, 3-, and 4-month lag SSC. SST also exhibited a stronger correlation with standardized CPUE. Therefore, SST and SSC_2 were selected as final variables for model construction. An arithmetic mean model with SST and SSC_2 was deemed suitable to predict the albacore feeding habitat zone in the SIO. The preferred ranges of SSC_2 and SST for the feeding habitat of immature albacore were 0.07–0.09 mgm−3 and 16.5–18.5 °C, respectively, and mainly centralized at 17.5 °C SST and 0.08 mgm−3 SSC_2. The selected habitat suitability index model displayed a high correlation (R2 = 0.8276) with standardized CPUE. Overall, temperature and ocean chlorophyll were found to be essential for albacore habitat formation in the SIO, consistent with previous studies. The results of this study can contribute to ecosystem-based fisheries management in the SIO by providing insights into the habitat preference of immature albacore tuna in the SIO.

Abundance, distribution and reproduction of the Data-Deficient species (Squalus blainville) around Sardinia Island (central western Mediterranean Sea) as a contribution to its conservation

Data-Deficient (DD) species are currently under threat because of the paucity of information regarding their abundance, distribution and biological traits. In this study we analysed temporal trends and bioecological features of the DD shark, Squalus blainville. Biological and fishery data were collected through two different scientific surveys spanning 1994–2018 and commercial hauls around Sardinia Island (central western Mediterranean) from 2008 to 2018. The analysis of temporal trends based on abundance data revealed a significant population decline over time. The late attainment of maturity and low fecundity of S. blainville are suspected to have contributed to making it highly vulnerable to overfishing. No bathymetric segregation by sex and size was found. However, the almost exclusive presence of pregnant females south-west of Sardinia could be due to sexual spatial segregation. This is also supported by histological findings showing long-term sperm storage to ensure the persistence of the species when females and males are separated. The documented decline of this species, its low reproductive potential and similarities in the depth distribution of immature and mature individuals indicate the need for urgent protection plans for S. blainville in Sardinian waters.

A handy trap for capturing of the adult river lamprey in streams

In the Baltic Sea Basin, the river lamprey, Lampetra fluviatilis (L.), is still important to commercial fishing; however, the species is on the decline, especially in the southern part of the catchment area. At present, the river lamprey is protected by European law that requires monitoring its stocks. This article describes a convenient trap for catching adult river lamprey in streams. The gear is a small fish-pot or hoop-net with two chambers. Operating the trap is very simple, and tests indicated its usefulness for monitoring ascending river lamprey. Thus, this trap design is recommended as a standard tool for use in the future, especially since there is a lack of commercial fishery data.