摘要:

A telephone survey was conducted regarding tournaments for largemouth bass Micropterus salmoides in Kansas reservoirs. A total of 297 Kansas licensed anglers were contacted and asked to be interviewed; these anglers were also respondents to the 1995 Kansas Licensed Angler Use and Preference Survey. Anglers were grouped into three categories: largemouth bass anglers in a sporting club (club), largemouth bass anglers not in a sporting club (nonclub), and nonlargemouth bass anglers not in a sporting club (general). Response rates for angler categories were 77% for club, 88% for nonclub, and 89% for general. More club anglers participated in fishing tournaments in Kansas than nonclub or general anglers. The majority of anglers in all angler categories either agreed or strongly agreed that fishing tournaments should be held on Kansas reservoirs. The majority of anglers in all angler categories disagreed or strongly disagreed with the statement “Fishing tournaments for largemouth bass in Kansas that require live release should not have to follow the 18-inch length limit.” Similarly, respondents in all angler categories disagreed that largemouth bass fishing tournaments should be exempt from current creel limits. These data provide important information for managing largemouth bass fishing tournaments on Kansas reservoirs.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0188:EOBTFF>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Population densities of smallmouth bass Micropterus dolomieu (SMB) have declined in streams of the Missouri Ozark border region since the 1940s while replacement by largemouth bass M. salmoides (LMB) has occurred in some cases. A recent field study found that two habitat variables, known to have been influenced by human activities, largely explained present densities of SMB and LMB throughout streams in this region. Densities of SMB declined with increasing maximum summer temperature (range, 23–33°C) and percent pool area while LMB densities increased with these variables. To explore these correlations from a bioenergetics perspective, we determined maximum consumption rates of SMB and LMB at 18, 22, 26, and 30°C. Consistent with the field study's findings about temperature, maximum consumption results indicated that SMB scope for growth becomes progressively restricted at temperatures higher than 22°C, whereas this does not occur until 26°C for LMB. Maximum consumption rates of SMB also averaged twice those of the LMB, indicating a much greater per capita demand for prey biomass by SMB and suggesting SMB have a lesser capacity to tolerate prey base decline than LMB. The higher consumptive demand by the SMB may relate to the field study's finding that SMB density declined with increasing pool area. Increases in pool quantity are accompanied by reduced food production and the loss of prey types known to be of importance to SMB. Findings indicate that changes in growth conditions for SMB and LMB may be a proximate cause for shifts in distribution of black bass Micropterus spp. in Ozark border region streams.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0192:BIIBBD>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

We constructed stream maps for a low-gradient trout stream in southwestern Virginia during autumn (base flow) and spring (elevated flows) to compare spatial and temporal variation in stream habitats. Pool–riffle sequencing and total area occupied by pools and riffles changed substantially depending on the level of discharge: reduced discharge resulted in an increase in total pool surface area with more numerous but smaller pools than during spring. In contrast, total surface area of riffles decreased with decreasing discharge as did total wetted surface area. These findings suggest caution should be exercised when comparing seasonal or annual surveys, applying habitat guidelines for assessment or management, evaluating fish standing crop potential from predictive habitat models, or predicting availability of habitat or biological information at times other than when stream surveys are conducted. We demonstrate the potential dangers by intentionally applying biological sample results taken at one discharge level to the same stream reach at a different discharge level. Our results clearly illustrate the importance of acquiring physical and biological information during similar discharges.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0198:HSATIO>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Fishery managers use data on catch and harvest rates collected with both on-site and off-site angler surveys. Many researchers have hypothesized that catch rates from these surveys will differ systematically due to various biases. However, few direct comparisons have been made between the two survey methods using the same waters and seasons. We compared catch and harvest rates for three coldwater species, individually and combined, from concurrent mail and on-site surveys on five Maine lakes during the 1994 ice fishing season. Comparisons were also made for two Maine lakes during the 1994 open-water season. Estimates of catch and harvest from the mail survey exceeded the rates from on-site surveys in 28 of 38 comparisons for individual species. The average on-site to mail survey ratio was 0.40 for catch rates and 0.66 for harvest rates but varied significantly by lake, season, and species. The results suggest that mail surveys do not produce accurate estimate of catch and harvest rates. In situations where only mail survey data are available, fisheries managers should recognize that mail survey catch and harvest rates are likely to be overestimates compared with on-site data.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0203:CACAHR>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Six teams tested recommended procedures for estimating fish kill magnitude during a simulated fish kill in a small east Texas stream. Dead fish were added to the stream and counted 16 h later using accepted guidelines for sampling and counting dead fish. Thirty-one percent of the 943 dead fish that were initially placed in the stream remained when teams counted fish. The highest estimate of dead fish included only 39% of the total number of dead fish added to the stream. Independent estimates were moderately variable (mean = 308, SD = 54) and accurate when compared with the number of carcasses remaining in the stream (N = 291) at the time of the investigation. Small individuals (<15 cm total length, TL) and less abundant species were underestimated to a greater degree than large individuals (>35 cm TL) and more abundant species. Counts involving fewer fish resulted in a greater underestimation of fish killed than did counts of larger numbers of fish. Complete enumeration gave the most accurate estimate of the number, species, and size distribution of carcasses remaining in the stream. However, all estimates grossly underestimated the total number of dead fish placed in the stream. Scavengers probably removed most of the dead fish during the 16 h before the investigation.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0209:ACOFKC>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

The effects of surgical staples on incision healing and long-term fish growth are largely unknown. To determine these effects, we implanted 50 rainbow trout Oncorhynchus mykiss with dummy radio transmitters, closed incisions with either silk sutures or steel staples, and monitored these fish for 6 months. Surgeries with staples were performed twice as fast as suture surgeries. Incisions closed with staples had three times less epidermal infection than sutured incisions. Fish with staples lost significantly fewer visible implant tags and had a lower incidence of abdominal bloating, two signs of systemic stress, than did fish with sutures. Six months after surgery, treatment and control groups had grown equally. The lower incidence of local and systemic infection caused by staples and the faster speed with which they can be applied suggest stapling is a better method than suturing for closing incisions.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0215:COSSAS>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A device is described that can be used by scuba divers to obtain quantitative macroinvertebrate samples from flat surfaces. Called the “claw sampler,” it was designed to collect macroinvertebrates colonizing spawning benches in Tennessee reservoirs. The spawning benches, 3.0-m × 25-cm wood slabs attached to 30-cm concrete blocks, were used to simulate logs under which smallmouth bass Micropterus dolomieu spawn. The claw sampler effectively collected quantitative samples of coleopterans, dipterans, ephemeropterans, odonates, trichopterans, cladocerans, and gastropods that colonized the spawning benches and provided a readily available food supply for age-0 smallmouth bass and other fishes.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0219:TCSAMS>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

No abstract available.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0221:ITSFMM>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

After nearly a century of the propagation of muskellunge Esox masquinongy in Wisconsin, hatchery production is capable of meeting the stocking needs of management. Stocking of fertilized eggs, fry, fingerlings, or yearling muskellunge can each be used to develop a cost-effective stocking strategy if environmental conditions of a specific water body are known. Although low poststocking survival has been a problem for management, stocking still contributes to the sport fishery, however, future stocking strategies need to consider the effects of stocked muskellunge on natural stocks of muskellunge and other fishes.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0223:MSSIWT>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

Recent advances in artificial feeding techniques have increased the numbers and reliability of fingerling production of muskellunge Esox masquinongy in Iowa. Most of the muskellunge fingerlings produced in Iowa since 1984 were raised on dry pelleted feed. We compared the survival of pellet-reared fingerlings with traditional minnow-reared fingerlings stocked into Spirit and West Okoboji lakes in northwest Iowa. Beginning in 1991, all muskellunge fingerlings were marked with freeze brands to differentiate the type and year that fingerlings were stocked. Adult muskellunge were caught each spring with 360-ft, 2.5-in-bar-mesh gill nets. All muskellunge caught were examined for brands, individually marked with visual implant tags, and released into the same lake as captured. Abundance and survival of stocked fingerlings to year-classes were estimated from recaptures of branded and individually marked muskellunge. In most years none of the pellet-reared fingerlings survived. The poor survival of these fish was most likely due to a combination of poor health, poor color (camouflage barring was muted and virtually nonexistent), and small size (6–9 in total length, TL). Minnow-reared muskellunge fingerlings were much larger (10–13 in TL), displayed strong camouflage barring and no apparent nutritional problems, and survived much better than pellet-reared fish. Minnow-fed fingerlings stocked in the spring survived much better than those stocked in the fall. One spring stocking of only 572 fish more than doubled the muskellunge population in West Okoboji Lake. Such success with stocking muskellunge in the spring could drastically change stocking strategies in Iowa; fewer fish may need to be stocked, and management objectives could be met without annual stockings.

ISSN:0275-5947    

DOI:10.1577/1548-8675(1999)019<0230:SGAAOP>2.0.CO;2

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor