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Angling of hybrid sunfish from a hatchery pond with potential implications for community fisheries

Aquaculture and Fisheries 2023年第1期8卷 91-95页

作者： Brian G.Blackwell matthew j.ward Todd M.Kaufman South Dakota Department of Game Fish and Parks603 East 8th AvenueWebsterSD57274USA South Dakota Department of Game Fish and Parks44437139A StreetWaubaySD57273USA

Hatcheries are frequently called upon to produce catchable-sized fish for stocking community fishing *** attributes of fish selected for stocking into community ponds are that they are easy to produce in a hatchery system to sizes anglers are interested in catching and they provide anglers with high catch rates once *** sunfish[male Bluegill(Lepomis macrochirus)×female Green Sunfish(***)]have attributes that potentially make them attractive for use in community fishing *** assessed initial angler catch rates of 100 stocked hybrid sunfish in a 0.12-ha hatchery pond and after being subjected to angling(four,1-hr catch-and-release fishing events with five anglers).We also investigated whether catch rates would change following a supplemental stocking of an additional 100 hybrid sunfish(four,1-hr catch-and-release fishing events with five anglers).The anal fin of each fish in the second stocking was hole punched to differentiate them from those of the first stocking and fish caught by anglers were hole punched in the caudal fin each time they were caught before being released back into the *** catch rates were highest during initial fishing events that followed stocking(9.2 fish/angler hr and 18.0 fish/angler hr)and substantially declined in subsequent events(≤3.4 fish/angler hr).Catches of the newly stocked fish and previously stocked fish contributed to the high catch following the supplemental ***(80%)of the fish were caught in the first 30 min of each event and 45%were caught during the first 10 *** were able to catch 88%of the fish from the first stocking and 67%from the second stocking at least *** mortality occurred during the study as all fish were recovered when the pond was *** results suggest that hybrid sunfish will potentially provide high initial catch rates following stocking into community ponds,but managers should expect reduced catch rates following initial fishing even without h

关键词： Hybrid sunfish Angling Community fishing ponds

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Is iron overload in alcohol-related cirrhosis mediated by hepcidin?

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World journal of Gastroenterology 2009年第46期15卷 5864-5866页

作者： Tariq Iqbal Azzam Diab Douglas G ward matthew j Brookes Chris Tselepis jim Murray Elwyn Elias Department of Gastroenterology University Hospital BirminghamVincent Drive Depart ment of Cancer Studies University of BirminghamVincent Drive Department of Hematology University Hospital BirminghamVincent Drive

In this case report we describe the relationship between ferritin levels and hepcidin in a patient with alcohol-related spur cell anemia who underwent liver *** demonstrate a reciprocal relation-ship between serum or urinary hepcidin and serum ferritin,which indicates that inadequate hepcidin production by the diseased liver is associated with elevated serum *** ferritin level falls with increasing hepcidin production after *** inflammatory indices(IL6)nor erythropoietin appear to be related to hepcidin expression in this *** suggest that inappropriately low hepcidin production by the cirrhotic liver may contribute substantially to elevated tissue iron stores in cirrhosis and speculate that hepcidin replacement in these patients may be of therapeutic benefi t in the future.

关键词： Alcohol Iron Anaemia Hepcidin Cirrhosis

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Pond Substrate Type Affects Yellow Perch Fingerling Size at Harvest

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Open journal of Animal Sciences 2021年第1期11卷 31-36页

作者： matthew j. ward South Dakota Department of Game Fish and Parks Blue Dog State Fish Hatchery Waubay USA

Fish size and harvest density generally exhibit a negative relationship in pond culture, but the influence that pond substrate type can have on this relationship is not well understood. To evaluate the influence of pond substrate type on yellow perch (Perca flavescens), harvest density (number/hectare) was linearly regressed against individual fingerling size (grams) for lined (n = 48) and earthen (n = 40) substrate ponds that were treated similarly in terms of organic fertilizer use and the number of days in the pond over 12 culture seasons at Blue Dog Lake State Hatchery, South Dakota, USA. Harvest density explained 45 and 39% of the variation in yellow perch size in lined and earthen-substrate ponds (all P P = 0.62);however, fingerling size was significantly larger in lined ponds regardless of density that varied from near 0 to 700,000 per hectare (y-intercept comparison, P < 0.01). At the same harvest density, lined ponds will tend to produce larger yellow perch fingerlings compared to earthen ponds when similar organic fertilizers are used.

关键词： Yellow Perch Pond Culture Pond-Substrate Type

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Increased hepcidin expression in colorectal carcinogenesis

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World journal of Gastroenterology 2008年第9期14卷 1339-1345页

作者： Douglas G ward Keith Roberts matthew j Brookes Howard joy Ashley Martin Tariq Ismail Robert Spychal Tariq Iqbal Chris Tselepis CRUK Institute for Cancer Studies University of Birmingham Birmingham B15 2THUnited Kingdom

AIM:To investigate whether the iron stores regulator hepcidin is implicated in colon cancer-associated anae- mia and whether it might have a role in colorectal car- cinogenesis. METHODS: Mass spectrometry (MALDI-TOF MS and SELDI-TOF MS) was employed to measure hepcidin in urine collected from 56 patients with colorectal cancer. Quantitative Real Time RT-PCR was utilised to determine hepcidin mRNA expression in colorectal cancer tissue. Hepcidin cellular localisation was determined using im- munohistochemistry. RESULTS: We demonstrate that whilst urinary hepcidin expression was not correlated with anaemia it was posi- tively associated with increasing T-stage of colorectal cancer (P < 0.05). Furthermore, we report that hepcidin mRNA is expressed in 34% of colorectal cancer tissue specimens and was correlated with ferroportin repres- sion. This was supported by hepcidin immunoreactivity in colorectal cancer tissue. CONCLUSION: We demonstrate that systemic hepcidin expression is unlikely to be the cause of the systemic anaemia associated with colorectal cancer. However, we demonstrate for the first time that hepcidin is expressed by colorectal cancer tissue and that this may represent a novel oncogenic signalling mechanism.

关键词： Iron Hepcidin Colon Cancer Anaemia Mass spectrometry

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一种新的筛板塔负荷系数关联式

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化工装备技术 1990年第3期11卷 34-35页

作者： Thomas j.ward 倪翔

蒸馏塔和吸收塔塔径计算通常基于最大允许气速,而确定气速需要知道负荷系数C_F值。图1为负荷系数与气液动能参数F_(LV)的关联图,参变数是塔板间距t_o动能参数F_(LV)液体质量流速LM_L、气体质量流速VM_v(单位为磅/秒)以及两者的流体密度... 详细信息

蒸馏塔和吸收塔塔径计算通常基于最大允许气速,而确定气速需要知道负荷系数C_F值。图1为负荷系数与气液动能参数F_(LV)的关联图,参变数是塔板间距t_o动能参数F_(LV)液体质量流速LM_L、气体质量流速VM_v(单位为磅/秒)以及两者的流体密度ρ_L、ρ_V有关。

关键词：筛板塔负荷系数关联式

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Filamentous Green Algae Reduce Walleye Fingerling Production in Earthen-Substrate Ponds

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Open journal of Animal Sciences 2021年第2期11卷 157-163页

作者： matthew j. ward Ryan A. Rasmus South Dakota Department of Game Fish and Parks Blue Dog State Fish Hatchery Waubay USA

Reduced walleye (Sander vitreus) fingerling production possibly related to nuisance filamentous green algae and overly stable water chemistry patterns is a concern in earthen-substrate ponds at Blue Dog State Fish Hatchery, South Dakota, USA. We describe the success of alfalfa (Medicago sativa) meal (AFM, n = 2), alfalfa meal plus soybean (Glycine max) meal (AFM + SBM, n = 1), and alfalfa meal plus liquid 28N:0P:0K (AFM + 28:0:0, n = 1) at achieving walleye production objectives (>104,000 walleye and 32 kilograms/hectare) as well as the occurrence of filamentous green algae and the associated patterns of am

关键词： Filamentous Green Algae Walleye Pond Culture

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液态和气态氮对铝挤压生产率的影响

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模具技术 1989年第2期 4-11页

作者： Thomas j.ward 张水忠

作为一种有效的惰性保护方法,气态氮已在铝挤压业中使用了一段时间,以减少模具模口部分出口端氧化物的形成。Heffron和Hull[1]报道说,氮提供了一种不易形成氧化物的保护气氛,这样提高了表面质量,并增加了挤压速度。在实际挤压过程中,通... 详细信息

作为一种有效的惰性保护方法,气态氮已在铝挤压业中使用了一段时间,以减少模具模口部分出口端氧化物的形成。Heffron和Hull[1]报道说,氮提供了一种不易形成氧化物的保护气氛,这样提高了表面质量,并增加了挤压速度。在实际挤压过程中,通过加工在模具垫板上的凹槽,吹入一股稳定的氮气流,该氮气就取代了空气,在挤压品四周形成一层惰性保护气氛。为了降低挤压工艺温度,并有利于提高挤压速度,对模具进行了冷却[2,3]。

关键词：液态氮气态氮铝材挤压生产率

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Availability and Timing of Fathead Minnow Supplementation Influence Largemouth Bass Survival and Production in Rearing Ponds

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Open journal of Animal Sciences 2020年第3期10卷 337-345页

作者： matthew j. ward Steven R. Chipps South Dakota Department of Game Fish and Parks Blue Dog Lake State Hatchery Waubay USA U.S. Geological Survey South Dakota Cooperative Fish and Wildlife Research Unit McFadden Biostress Laboratory Department of Natural Resource Management South Dakota State University Brookings USA

Adjustments to rearing practices should be justified with increases in production, stocking success, or angler satisfaction. Largemouth bass (Micropterus salmoides) production was assessed between hatchery ponds where fish were restricted to an invertebrate diet or received supplemental fathead minnow (Pimephales promelas) forage during 2015. At harvest, age-0 bass yield was 4.5 times greater and average fish length was 38 mm longer, in the pond that received fathead minnow. In 2016, a second study evaluated the timing of minnow supplementation that included earlier stockings of small fathead minnow (30 mm) minnows. With earlier supplementation, bass yield was 2.3 times greater and fish averaged 14 mm longer at harvest. Bass survival was approximately 38% higher during 2015 when supplementation occurred and 25% higher during 2016 when minnow supplementation began earlier. Our findings show invertebrate forage was probably limiting bass production in hatchery ponds and supplementing with appropriately-sized fathead minnows increased age-0, largemouth bass production.

关键词： Largemouth Bass Culture Pond-Rearing Fathead Minnow Stocking

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Walleye Egg Survival Was Unaffected by Four Semen Inclusion Techniques during Artificial Fertilization

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Open journal of Animal Sciences 2023年第2期13卷 199-204页

作者： matthew j. ward Brian G. Blackwell South Dakota Department of Game Fish and Parks Blue Dog State Fish Hatchery Waubay USA South Dakota Department of Game Fish and Parks District Office Webster USA

Improving the percent hatch during artificial spawning of walleye (Sander vitreus) could save agencies substantial resources. Semen inclusion techniques used to artificially fertilize walleye eggs may have a subsequent influence on the percent hatch. We compared walleye egg survival to the early embryo stage across four semen inclusion techniques used during fertilization to determine if one or more of the techniques would result in a higher percent hatch. Six mL of freshly collected (within 2 h) semen was presented to common pools of walleye eggs separated into 250 mL lots by either 1) pouring semen on top of the eggs before sperm activation, 2) placing 3 mL of semen below and above the eggs before sperm activation, 3) pouring 3 mL of semen on top of the eggs, activating sperm, and adding the remaining 3 mL of semen after 30 s, or 4) activating the sperm by adding semen to 1 L of water, mixing and pouring the solution on the eggs within 3 s. All treatments received 1 L of filtered lake water for sperm activation and fertilization. Mean egg survival was similar ranging from 49.5% to 56.7% among the four techniques and was not significantly different across methods. These results suggest that any of the semen inclusion techniques will likely provide a similar percent hatch for walleye eggs when 250 mL of eggs, 6 mL of semen, and 1 L of water are used during fertilization.

关键词： Walleye Egg Collection Walleye Propagation Walleye Spawning Operations

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Factors Associated with Increased Walleye Production in Lined Compared to Earthen-Substrate Ponds

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Open journal of Animal Sciences 2021年第1期11卷 50-61页

Walleye (Sander vitreus) fingerling production can be enhanced when the pond substrate is altered from earthen soils to an exposed liner;however, few differences in water chemistry, prey densities, and food habits have been identified that could potentially explain this production difference. Lack of an explanation led to further comparison of walleye fingerling culture between substrate types during 2016. Two ponds of each type were stocked with 1- to 3-day-old walleye fry, but lined ponds received an additional 104,166 fry/ha and were stocked 1 or 2 days later than earthen ponds (May 10). Walleyes in lined ponds achieved a growth advantage on May 31 (+2.5 mm) and on June 6 (+3.3 mm), but lengths were not significantly different at harvest (June 15). Lined ponds increased walleye yield and number 1.8-fold while not reducing individual fish size at harvest compared to earthen ponds. Walleye food habits were generally similar between pond types with a greater number of zooplankton being consumed through June 6 followed by an increase in larval chironomid consumption at harvest (June 15). After May 30, lined ponds exhibited lower dissolved oxygen and higher ammonia-nitrogen concentrations even though earthen ponds received additional (157 kg/ha) alfalfa (Medicago sativa) meal fertilize

关键词： Walleye Fingerling Culture Pond-Substrate Type

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