Mercury in Juvenile Solea senegalensis: Linking Bioaccumulation, Seafood Safety, and Neuro-Oxidative Responses under Climate Change-Related Stressors

Mercury (Hg) is globally recognized as a persistent chemical contaminant that accumulates in marine biota, thus constituting an ecological hazard, as well as a health risk to seafood consumers. Climate change-related stressors may influence the bioaccumulation, detoxification, and toxicity of chemical contaminants, such as Hg. Yet, the potential interactions between environmental stressors and contaminants, as well as their impacts on marine organisms and seafood safety, are still unclear. Hence, the aim of this work was to assess the bioaccumulation of Hg and neuro-oxidative responses on the commercial flat fish species Solea senegalensis (muscle, liver, and brain) co-exposed to dietary Hg in its most toxic form (i.e., MeHg), seawater warming (ΔT°C = +4 °C), and acidification (pCO2 = +1000 µatm, equivalent to ΔpH = −0.4 units). In general, fish liver exhibited the highest Hg concentration, followed by brain and muscle. Warming enhanced Hg bioaccumulation, whereas acidification decreased this element’s levels. Neuro-oxidative responses to stressors were affected by both climate change-related stressors and Hg dietary exposure. Hazard quotient (HQ) estimations evidenced that human exposure to Hg through the consumption of fish species may be aggravated in tomorrow’s ocean, thus raising concerns from the seafood safety perspective.

Minat Wisatawan Terhadap Produk Ampalang Ikan Pipih Khas Kalimantan Timur

The specific purpose of this study was to determine the extent to which tourists' buying interest in East Kalimantan's specialty is especially the food product of flat fish. The general purpose of this study is to improve the work of human resources in processing typical products of East Kalimantan in improving the economy. The analytical technique used was the Stuctural Equation Model (SEM) with AMOS 21. The data were taken from questionnaires distributed to tourists who were shopping for typical East Kalimantan products in the cities of Samarinda, Balikpapan and Bontang. The results showed that the variables of interest had a negative and insignificant ef ect on the economy, it could be concluded that the price of ered did not become an obstacle for tourists to buy the product. The results of this study indicate that the type of product, demography, psychology has a positive ef ect on tourist buying interest.

Characterization and Evolution of Dishevelled Genes in Paralichthys olivaceus

The study examined the key gene Dishevelled (Dvl or Dsh) in Wnt (Wingless and INT-1) signaling pathways. The gene (Dvl) was characterized in the flat fish Paralichthys olivaceus for its expression pattern structure and phylogenetics at the Ocean University of China in Qingdao, China in 2018. Three gene paralogues (Dvl1, Dvl2 and Dvl3) of the Dvl family were cloned in P. olivaceus and a N-terminal DAX domain, a central PDZ domain and a C-terminal DEP domain were discovered in all three protein paralogues. Phylogenetic analysis revealed that Dvl genes in P. olivaceus are most closely related to those in marine teleosts Larimichthys crocea and Stegastes partitus, followed by those in Cynoglossus semilaevis. For each Dvl gene, the genes in teleosts fall into a clade independent from the ones in other vertebrates, suggesting that the duplication of Dvl genes occurred prior to the divergence of vertebrates. The temporal expression patterns of the three Dvl genes were characterized during the embryonic development of teleosts. In P. olivaceus, all three Dvl genes remain at low expression levels during the early stages of development until gastrula stage, when the expression of Dvl1 was significantly up-regulated. The research revealed vastly different temporal expression patterns of Dvl genes and suggested that the structure of Dvl proteins is conserved, but the expression patterns of Dvl genes vary significantly among different classes.

ANALISIS USAHA PENGOLAHAN AMPLANG IKAN PIPIH (Notopterus chilata) SKALA RUMAH TANGGA DI KOTA PALANGKA RAYA PROVINSI KALIMANTAN TENGAH

Usaha pengolahan amplang ikan pipih di Kota Palangka Raya untuk pengembangan usaha kedepan sangat baik. Dengan adanya dukungan tersedianya terus menerus bahan baku ikan pipih, baik dari tangkapan perairan, tangkapan alam, maupun usaha budidaya ikan pipih dan modal yang dikucurkan oleh pemerintah baik berupa peralatan usaha maupun pelatihan-pelatihan bagi para pengusaha untuk dapat terus berkembang.Penelitian ini dilakukan dengan tujuan Penelitian ini dilakukan di Kota Palangka Raya Provinsi Kalimantan Tengah. Data yang digunakan adalah data primer dan sekunder.Metode yang digunakan dalam pengolahan dan analisis data dalam penelitian ini adalah purposive sampling Amplang datar ikan pengolahan rumah tangga bisnis keuntungan sebesar Rp. 12.169 juta, - per tahun. Dari lapangan menunjukkan fakta bahwa bisnis ini tetap menguntungkan dengan kelangsungan hidup dalam waktu yang lamaBerdasarkan nilai analisis keuangan dengan menggunakan kriteria investasi Net Benefit Cost Ratio ( Net BCR ) 5 % = 3,032073039 dan B / C ratio Bersih 13,5% = 1,526361382 lebih besar dari 1 berarti bahwa usaha ini layak untuk dilanjutkan .Khusus untuk datar usaha pengolahan ikan amplang ( Notopterus chilata ) rumah tangga di kota Palangka Raya Kalimantan Tengah Provinsi amplang permintaan produk ikan dengan menawarkan flat atau D = S yang sama , berarti ampalng produksi ikan untuk memenuhi pasar datar.Flat fish processing business amplang household in the city of Palangka Raya for future business development very well with the support of continuous availability of raw materials and capital flat fish are disbursed by the government in cash, business equipment and training for entrepreneurs to be able to continue developed. The research was conducted in the City of Palangka Raya Central Kalimantan Province. The data used were primary and secondary data. The method used in processing and analyzing data in this study was purposive sampling.Amplang flat fish processing business households profit of Rp. 12,169 million, - per year. From the field indicate the fact that this business remains favorable with survival in a long time.Based on the value of financial analysis using the criteria of investment Net Benefit Cost Ratio (BCR Net) 5% = 3.032073039 and Net B / C ratio of 13.5% = 1.526361382 is greater than 1 means that the business is feasible to proceed.Especially for flat fish processing business amplang (Notopterus chilata) household in the city of Palangka Raya Central Kalimantan Province amplang demand for fish products by offering the same flat or D = S; means ampalng fish production to meet market flat.