A national survey data for the technical and economic assessment of African catfish production in Nigeria before and during the COVID-19 period.

This data article presents a dataset obtained from a national survey of African catfish production in Nigeria. The African catfish is an important aquaculture species in various regions in the world and it is, after Tilapia, the most commonly cultured fish in Africa. Nigeria's share in the global production of African catfish exceeds 67 %. The dataset encompasses data collected from ten major catfish-producing states in Nigeria, with a focus on two distinct periods: before and during the COVID-19 pandemic. A total of 609 operations were captured for the pre-COVID and 509 for the COVID period. The dataset includes a wide array of variables, covering the cost and quantities of inputs and outputs, socioeconomic factors, market dynamics, feed types, challenges faced by farmers, scale of production, and farmers' level of experience. It offers valuable insights and opportunities for various stakeholders. Researchers can utilize it to explore production performance, resilience, and adaptation strategies. Industry players, including catfish farmers and suppliers, can make data-driven decisions to enhance their operations. Policymakers can formulate evidence-based policies to support sustainable growth in the catfish farming sector. Other developing countries can draw lessons from Nigeria's experiences to bolster their aquaculture sectors.

Adsorption kinetics studies of ciprofloxacin in soils derived from volcanic materials by electrochemical approaches and assessment of socio-economic impact on human health.

The use of antibiotics in the livestock sector has resulted in the entry of these drugs into the soil matrix through the disposal of manure as an organic amendment. To define the fate of these drugs, it is necessary to evaluate kinetic aspects regarding transport in the soil-solution. The aim of this paper is to evaluate the adsorption kinetic parameters of Ciprofloxacin (CIPRO) in Ultisol and Andisol soil which allows obtaining main kinetic parameters (pseudo-first and pseudo-second order models) and to establish the solute transport mechanism by applying kinetic models such as the Elovich equation, Intraparticle diffusion (IPD) and, the Two-site non-equilibrium models (TSNE). The adsorption kinetics of this fluoroquinolone (FQ), on both soils derived from volcanic ashes, is developed using electrochemical techniques for their determination. The experimental amount of CIPRO adsorbed over time (Qt) data best fit with the pseudo-second order kinetic models; R2 = 0.9855, Ɛ = 10.17% and R2 = 0.9959, Ɛ = 10.77% for Ultisol and Andisol, respectively; and where CIPRO adsorption was considered time dependent for both soils but the lower adsorption capacity in Ultisol; with 17.6 ± 2.8 µmol g-1; which could mean a greater risk in environmental. Subsequently, applying models to describe solute transport mechanisms showed differences in the CIPRO adsorption extent for the fast and slow phases. Adsorption isotherms were evaluated, where Ultisol occurs on heterogenous sites as multilayers and Andisol by monolayer with similar Qmax. Finally, the socio-economic impact of antibiotic usage is presented, giving the importance of antibiotics in the livestock sector and their effects on human health.

[The effects of induced labor at 41 week of pregnancy on mode of delivery and outcome].

INTRODUCTION: Rates of induction of labor (IOL) in Iceland and most neighboring countries have increased. Recent literature on IOL provided contradicting effects on mode of delivery, maternal and neonatal outcome. MATERIAL AND METHODS: The aim of this study was to evaluate the impact of IOL in late term pregnancies (≥41 weeks) on mode of delivery, maternal and neonatal outcome. A retrospective cohort study of deliveries after 41 weeks of pregnancy was conducted for all deliveries in Landspitali in the period 2013-2016, comparing outcomes of IOL deliveries to spontaneous labor deliveries. Logistic regression analysis was performed to determine the impact of the independent variables on the outcome. RESULTS: Of the 2419 women cohort, 61.8% had a spontaneous onset of labor and 38.2% had IOL. The results show that IOL increases probability of caesarean section in primiparas women (p<0.01). IOL increases the use of epidural anesthesia in labor, both for primiparas (p<0.001) and multiparas (p<0.05). Similar results where observed in the neonatal outcome in both groups. Gestational age increases the probability of instrumental delivery (p<0.05), caesarean section (p<0.01), use of epidural anesthe-sia (p<0.01), Apgar <7 at 5 minutes (p<0.01) and fetal distress (p<0.01). CONCLUSION: Induction of labor has some negative impact on maternal outcome but leads at the same time to a shorter preg-nancy, which again decreases negative impact of prolonged pregnancy. It is important to evaluate the advantages and disadvantages of induction of labor before making a decision when to induce labor.

The contingent valuation study of Heiðmörk, Iceland - Willingness to pay for its preservation.

The decision-making and policy formation context in Iceland has been largely devoid of total economic valuations in cost-benefit assessments. Using an internet survey and applying the double bounded dichotomous choice methodology, this contingent valuation study sets out an estimate of the total economic value pertaining to Heiðmörk, a popular recreational area of urban open space located on the fringes of Reykjavík, Garðabær and Kópavogur. In so doing, this case study advances the practice of using non-market valuation techniques in the country. The welfare estimates provide evidence that Icelanders consider Heiðmörk to possess considerable total economic value, with taxpayers willing to pay a mean lump-sum tax in the range 17,039 to 24,790 ISK per payment to secure its preservation, equating to an estimated total economic value of between 5.87 and 35.47 billion ISK. In the light of possible competitive land management demands among Heiðmörk's three owners and many recreational users in the future, the establishment of these values and their potential use in cost-benefit assessments informs the debate concerning whether the area should be preserved or further developed to satisfy economic objectives. Additionally, a body of experimental evidence is formed suggesting that the increased duration of a fixed payment vehicle is associated with much higher total economic valuations compared to a one-year payment period.