Temperature effects on spawning and fingerling production of channel catfish Ictalurus punctatus

The goal of this study was to develop several techniques that utilize the use of geothermal water that can contribute to increased profitability for commercial catfish producers. The primary objectives of this study were to: 1) determine the heating requirement using degree-days of channel catfish spawning 2) improve the efficiency of artificial spawning and, 3) evaluate the effectiveness of stocking outdoor ponds and pools with channel catfish fry. The heating requirement for channel catfish spawning was determined to be between 99 and 129 degree days at the peak of spawning. There was no difference in degree-day values between spawns collected from heated ponds, and those collected from ambient ponds. There was also no difference in the weight and fertilization percentages between the egg masses collected before and after the start of natural spawning. In artificial spawning, female-female and male-female pairs showed no differences in the volume of unfertilized eggs collected, spawning latency, and neurulation in trials conducted before and after the start of natural spawning. Spawning behavior and egg release proved to be the most accurate way to determine the optimum time to manually strip female broodstock. Survival of fry before the start of regular spawning was greater in pools then in 0.04-ha ponds but that there was no difference in the stocking of sacfry or swim-up fry before or after the start of regular spawning in ponds or pools. The size, growth rate and number of fingerlings harvested are all affected by the survival percentage of fry stocked. Lower survival results in fewer fingerlings that grow faster and larger. Survival was mostly affected by the date of stocking and the number of growing days the fingerlings remained in the ponds or pools. These results support the use of geothermally heated ponds to increase the productivity of commercial catfish producers by providing better control over spawning, increased opportunities for artificial spawning, production of improved seedstock (including hybrids), and lengthened growing period for channel catfish fry. Future research needs to focus on improving these techniques and develop methods for efficient use of geothermal water in commercial catfish production

Flexibiliteit van ziekenhuisvastgoed in relatie tot de schillenmethode, gebouwstructuren en bouw- en installatietechniek

Corporate Real Estate ManagementReal Estate & HousingArchitectur

Rapid Assessment of Avoidable Blindness Dataset: Suriname (2013)

Anonymous participant level dataset including variables for visual acuity, spectacle use, lens status, cause of vision impairment, cataract surgical history, barriers to cataract surgery and population count data for five-year age-gender groups for males and females 50 years and olde

Efficacy of the PRESERFLO MicroShunt and a Meta-Analysis of the Literature

Background: Recent studies on the PRESERFLO MicroShunt suggest that it may be effective in lowering intraocular pressure (IOP); however, the number of studies on this device remains limited. Therefore, we assessed the efficacy of the PRESERFLO MicroShunt in patients with glaucoma and performed a meta-analysis of published results. Methods: Prospective study including all patients that underwent PRESERFLO MicroShunt surgery from 2018 onwards. Sub-analyses were performed for cataract-combined procedures. To compare our results, we performed a systematic review and meta-analysis. IOP, IOP-lowering medication and surgical complications reported in the retrieved studies were assessed. Results: A total of 72 eyes underwent PRESERFLO-implant surgery (59 as standalone procedure and 13 as cataract-combined procedure). No significant differences were found in IOP and IOP-lowering medication between both groups. The mean ± standard deviation IOP and IOP-lowering medications of both groups taken together declined from 21.72 ± 8.35 to 15.92 ± 8.54 mmHg (p < 0.001, 26.7% reduction) and 3.40 to 0.93 (p < 0.001, 72.6% reduction) at 1 year follow-up, respectively. Secondary surgeries were required in 19.4% of eyes, the majority (71.4%) within 6 months. The meta-analysis including 14 studies (totaling 1213 PRESERFLO MicroShunt surgeries) from the systematic review showed a mean preoperative IOP and IOP-lowering medication of 22.28 ± 5.38 and 2.97 ± 1.07, respectively. The three-years postoperative pooled mean was (weighted mean difference, 95% CI) 11.07 (10.27 [8.23–12.32], p < 0.001) mmHg and 0.91 (1.77 [1.26–2.28], p < 0.001) for IOP and IOP-lowering medication, respectively. The most common reported complication was hypotony (2–39%). Conclusion: The PRESERFLO MicroShunt is effective and safe in lowering IOP and the number of IOP-lowering medications

Efficacy of the PRESERFLO MicroShunt and a Meta-Analysis of the Literature

Background: Recent studies on the PRESERFLO MicroShunt suggest that it may be effective in lowering intraocular pressure (IOP); however, the number of studies on this device remains limited. Therefore, we assessed the efficacy of the PRESERFLO MicroShunt in patients with glaucoma and performed a meta-analysis of published results. Methods: Prospective study including all patients that underwent PRESERFLO MicroShunt surgery from 2018 onwards. Sub-analyses were performed for cataract-combined procedures. To compare our results, we performed a systematic review and meta-analysis. IOP, IOP-lowering medication and surgical complications reported in the retrieved studies were assessed. Results: A total of 72 eyes underwent PRESERFLO-implant surgery (59 as standalone procedure and 13 as cataract-combined procedure). No significant differences were found in IOP and IOP-lowering medication between both groups. The mean ± standard deviation IOP and IOP-lowering medications of both groups taken together declined from 21.72 ± 8.35 to 15.92 ± 8.54 mmHg (p p p p < 0.001) for IOP and IOP-lowering medication, respectively. The most common reported complication was hypotony (2–39%). Conclusion: The PRESERFLO MicroShunt is effective and safe in lowering IOP and the number of IOP-lowering medications

The cataract situation in Suriname: An effective intervention programme to increase the cataract surgical rate in a developing country

Aims To provide an overview of cataract data in Suriname and to describe and evaluate a programme to control cataract blindness in a developing country. Design Evaluation of hospital data and findings from a population-based cross-sectional survey. Methods The implementation of a new cataract surgical intervention programme was described and retrospectively evaluated by analysing the number of cataract operations and other related indicators at the Suriname Eye Centre (SEC) in the period 2006-2014. Findings of the recent Rapid Assessment of Avoidable Blindness (2013-2014) survey were used to evaluate the national cataract situation in Suriname in people aged ≥50 years (n=2998), including prevalence of cataract blindness, outcome and cataract surgical rate (CSR). Results Since the implementation of a new cataract intervention programme, the number of cataract operations at the SEC has increased from 1150 in 2006 to 4538 in 2014, leading to an estimated national CSR of 9103 per one million inhabitants. The prevalence of bilateral cataract blindness in Suriname was 0.8% (95% CI 0.2% to 1.3%) in individuals aged ≥50 years. The proportion of eyes with a postoperative visual acuity 5%

Causes of severe visual impairment and blindness in children in the Republic of Suriname

To determine the causes of severe visual impairment and blindness (SVI/BL) in children in Suriname (Dutch Guyana) and to identify preventable and treatable causes. 4643 children under 16 years of age were recruited from two locations: 33 children attending the only school for the blind were examined and 4610 medical records were analysed at an eye clinic. Data have been collected using the WHO Prevention of Blindness Programme eye examination record for children. 65 children were identified with SVI/BL, 58.5% were blind and 41.5% were severely visually impaired (SVI). The major anatomical site of SVI/BL was the retina in 33.8%, lens in 15.4% and normal appearing globe in 15.4%. The major underlying aetiology of SVI/BL was undetermined in 56.9% (mainly cataract and abnormality since birth) and perinatal factors 21.5% (mainly retinopathy of prematurity (ROP)). Avoidable causes of SVI/BL accounted for 40% of cases; 7.7% were preventable and 32.3% were treatable with cataracts and ROP the most common causes (15.4% and 12.3%, respectively). More than a third of the SVI/BL causes are potentially avoidable, with childhood cataract and ROP the leading causes. Corneal scarring from vitamin A deficiency does not seem to be a continuing issue in Surinam