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  • Biology  (371)
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  • 1
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/228 | 8 | 2011-09-29 22:28:04 | 228 | California Department of Fish and Game
    Publication Date: 2021-06-27
    Description: Full-scale field studies at the Diablo Canyon Nuclear Power Plant Site were resumed in early 1979 after a year of reduced effort to provide time for preparation of a final report of pre-operational studies. Since the power plant had not begun operation during this period (January 1,1979 - June 30, 1980), these data will be added to our pre-operational data base.Personnel time was spent at the site conducting intertidaland subtidal surveys, otter counts, conducting a shore survey of the Nereocystis in Diablo Cove, processing algae samples in the laboratory, and compiling the analyzed data.At permanent and random intertidal stations, red abalone numbers remained at very low levels; black abalone densities were higher than previous surveys at some stations.At subtidal stations, giant red sea urchin densities remained at low levels and, conversely, Laminaria and Pterygophora remained at a high level of abundance.Sea otters continued to forage in the study areas, with the highest observed numbers of otters occurring in the spring and summer, and the lowest numbers occurring in the fall and winter. (91pp.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 2
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    In:  http://aquaticcommons.org/id/eprint/15147 | 403 | 2014-05-29 07:04:06 | 15147 | United States National Marine Fisheries Service
    Publication Date: 2021-07-03
    Description: Understanding the ontogenetic relationship between juvenileSteller sea lions (Eumetopias jubatus) and their foraging habitat is key to understanding their relationship toavailable prey and ultimately their survival. We summarize dive and movement data from 13 young-of-the-year (YOY) and 12 yearling Steller sea lions equipped with satellite dive recorders in the Gulf of Alaska and Aleutian Islands (n=18), and Washington (n=7) from 1994 to 2000. A total of 1413 d of transmission (x =56.5 d, range: 14.5–104.1 d) were received. We recorded 222,073 dives, which had a mean depth of 18.4 m (range of means: 5.8−67.9 m; SD=16.4). Alaska YOY dived for shorter periods and at shallower depths (mean depth=7.7 m, mean duration=0.8 min, mean maximum depth=25.7 m, and maximum depth=252 m) than Alaskayearlings (x =16.6 m, 0=1.1 min, x = 63.4 m, 288 m), whereas Washington yearlings dived the longest and deepest (mean depth=39.4 m, mean duration=1.8 min, mean maximumdepth=144.5 m, and maximum depth=328 m). Mean distance for 564 measured trips was 16.6 km; for sea lions ≤10 months of age, trip distance (7.0 km) was significantly less than for those 〉10 months of age (24.6 km). Mean trip duration for 10 of the 25 sea lions was 12.1 h; for sea lions ≤10 months of age, trip duration was 7.5 h and 18.1 h for those 〉10 months of age.We identified three movements types: long-range trips (〉15 km and 〉20 h), short-range trips (〈15 km and 〈20 h) during which the animals left and returned to the same site, and transits to other haul-out sites. Long-range trips started around 9 months of age and occurred most frequently aroundthe assumed time of weaning, whereas short-range trips happened almost daily (0.9 trips/day, n=426 trips). Transitsbegan as early as 7 months of age, occurred more often after 9 months of age, and ranged between 6.5 and 454 km. The change in dive characteristics coincided with the assumed onset of weaning. These yearling sea lion movementpatterns and dive characteristics suggest that immature Steller sea lions are as capable of making the same typesof movements as adults.
    Keywords: Biology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 566-582
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  • 3
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    In:  http://aquaticcommons.org/id/eprint/15223 | 403 | 2014-06-01 18:59:40 | 15223 | United States National Marine Fisheries Service
    Publication Date: 2021-07-04
    Description: Along the west coast of the United States, the potential impact of increasing pinniped populations on declining salmonid (Oncorhynchus spp.) stocks has become an issue of concern. Fisheries managers need species-specific estimates of consumption by pinnipeds to evaluate their impact on salmonid stocks. To estimate consumption, we developed a model that estimates diet composition by reconstructing prey biomass from fecal samples. We applied the model to data collected from harbor seals (Phoca vitulina) that are present year-round in the lower Columbia River where endangered stocks of salmonids pass as returning adults and as seaward-migrating smolts. Using the same data, we applied the split-sample frequency of occurrence model, which avoids reconstructing biomass by assuming that each fecal sample represents an equal volume of consumption and that within each sample each prey item represents an equal proportion of the volume. The two models for estimating diet composition yielded size-specific differences in consumption estimates that were as large as tenfold for the smallest and largest prey. Conclusions about the impact of harbor seal predation on adult salmonids, some of their largest prey species, remain uncertain without some appropriate rationale or further information (e.g. empirical captive studies) to discriminate between these models.
    Keywords: Biology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 434-447
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  • 4
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    In:  http://aquaticcommons.org/id/eprint/15222 | 403 | 2014-06-01 19:00:08 | 15222 | United States National Marine Fisheries Service
    Publication Date: 2021-07-04
    Description: Marine mammal diet is typically characterized by identifying fish otoliths and cephalopod beaks retrieved from stomachs and fecal material (scats). The use and applicability of these techniques has been the matter of some debate given inherent biases associated with the method. Recent attempts to identify prey using skeletal remains in addition to beaks and otoliths are an improvement; however, difficulties incorporating these data into quantitative analyses have limited results for descriptive analyses such as frequency of occurrence. We attempted to characterize harbor seal (Phoca vitulina) diet in an area where seals co-occur with several salmon species, some endangered and all managed by state or federal agencies, or both. Although diet was extremely variable within sampling date, season, year, and between years, the frequency and number of individual prey were at least two times greater for most taxa when prey structures in addition to otoliths were identified. Estimating prey mass in addition to frequency and number resulted in an extremely different relative importance of prey in harbor seal diet. These data analyses are a necessary step in generating estimates of the size, total number, and annual biomass of a prey species eaten by pinnipeds for inclusion in fisheries management plans.
    Keywords: Biology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 423-433
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  • 5
    Publication Date: 2021-06-26
    Description: Coastal ecosystems and the services they provide are adversely affected by a wide variety of human activities. In particular, seagrass meadows are negatively affected by impacts accruing from the billion or more people who live within 50 km of them. Seagrass meadows provide important ecosystem services, including an estimated $1.9 trillion per year in the form of nutrient cycling; an order of magnitude enhancement of coral reef fish productivity; a habitat for thousands of fish, bird, and invertebrate species; and a major food source for endangered dugong, manatee, and green turtle. Although individual impacts from coastal development, degraded water quality, and climate change have been documented, there has been no quantitative global assessment of seagrass loss until now. Our comprehensive global assessment of 215 studies found that seagrasses have been disappearing at a rate of 110 square kilometers per year since 1980 and that 29% of the known areal extent has disappeared since seagrass areas were initially recorded in 1879. Furthermore, rates of decline have accelerated from a median of 0.9% per year before 1940 to 7% per year since 1990. Seagrass loss rates are comparable to those reported for mangroves, coral reefs, and tropical rainforests and place seagrass meadows among the most threatened ecosystems on earth.
    Keywords: Biology ; Ecology ; Management ; Pollution
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 12377-12381
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/17174 | 12051 | 2015-06-02 18:28:39 | 17174 | Instituto de Investigação Pesqueira, Mozambique
    Publication Date: 2021-07-10
    Description: The species Metapenaeus monoceros in Maputo Bay recruits to the fishery almost all over the year, but the main recruitment occurs over a short period of time, each year, during April-May. Growth curves were constructed by following the progression of modes over a period of time. The von Bertalanffy growth parameters were estimated as L∞=31.9 mm and K(monthly)=0.25, for males, and L∞=48.3 mm and K(monthly)=0.14, for females (Brinca and Sousa, 1984). Using data on growth and length composition of the catches, the following methods were applied to estimate mortality rates of M. monoceros: estimation of natural mortality by using approximative methods; use of c.p.u.e. data; catch curves; cohort analysis; average age and length methods.
    Keywords: Biology ; Metapenaeus monoceros ; mortality rates ; Maputo Bay ; Mozambique
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 41-76
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  • 7
    Publication Date: 2021-06-29
    Description: The eastern Steller sea lion (Eumetopias jubatus) populationcomprises animals that breed along the west coast of North America between California and southeastern Alaska. There are currently 13 major rookeries (〉50 pups): five insoutheastern Alaska, three in British Columbia, two in Oregon, and three in California. Overall abundance hasincreased at an average annual rate of 3.1% since the 1970s. These increases can largely be attributed to population recovery from predator-control kills and commercial harvests, and abundance is now probably as high as it has been in the last century. The number of rookeries has remained fairly constant (n=11 to 13) over thepast 80 years, but there has been a northward shift in distribution of both rookeries and numbers of animals.Based on the number of pups counted in a population-wide survey in 2002, total pup production was estimated to be about 11,000 (82% in southeastern Alaska and British Columbia), representing a total population size as approximately 46,000−58,000 animal
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 102-115
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  • 8
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    In:  http://aquaticcommons.org/id/eprint/9653 | 403 | 2012-08-14 12:22:47 | 9653 | United States National Marine Fisheries Service
    Publication Date: 2021-07-08
    Description: Nurseries play an important part in the production of marinef ishes. Determining the relative importance of different nurseries in maintaining the parental population, however, can be difficult. In the western Gulf of Alaska, the Kodiak Island vicinity may be particularly well suited as a pollock nursery because of a prey-rich nearshore environment. Our objectives were 1) to examine age-0 pollock body condition, growth, and diet for evidence of a nearshore-shelf effect, and 2) to determine if variationin the potential prey field of zooplankton was associated with this effect. This was a pilot study that occurredin three bays and over the adjacent shelf off east Kodiak Island during 5−18 September 1993. Sampling occurred only during night at locations where echo sign indicated thepresence of age-0 pollock. Echo sign was targeted to increase the chance of collecting fish given the limited vessel time. Fish condition was indicated by length-specific body weight. Growth rate indices were estimated for three different periods by using fish lengthage data and daily otolith increment widths: 1) from hatching date to capture, 2) 1−5 d before capture, and 3) 6−10 d before capture. Fish diet was determined from gut content analysis.Considerable variation among areas was evident in zooplankton composition, and fish condition, growth, anddiet. However, relatively high prey densities, as well as fish condition and growth rates indicated that ChiniakBay was particularly well suited as a pollock nursery. Hatching-date distributions indicated that most of the age-0 walleye pollock from bays were spawned earlier than were those from the shelf. The benefit of being reared in nearshore areas is therefore realized more by individuals that were spawned early than by individuals spawned relatively late.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 207-218
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  • 9
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    In:  http://aquaticcommons.org/id/eprint/9744 | 403 | 2012-08-16 13:22:02 | 9744 | United States National Marine Fisheries Service
    Publication Date: 2021-07-08
    Description: The northern quahog, Mercenaria mercenaria, ranges along theAtlantic Coast of North America from the Canadian Maritimes to Florida, while the southern quahog, M. campechiensis,ranges mostly from Florida to southern Mexico. The northern quahog was fished by native North Americans during prehistoric periods. They used the meats as food and the shells as scrapers and as utensils. The European colonists copied the Indians treading method, and they also usedshort rakes for harvesting quahogs. The Indians of southern New England made wampum from quahog shells, used it forornaments and sold it to the colonists, who, in turn, traded it to other Indians for furs. During the late 1600’s, 1700’s, and 1800’s, wampum was made in small factories for eventual trading with Indians farther westfor furs.The quahoging industry has provided people in many coastal communities with a means of earning a livelihood and has provided consumers with a tasty, wholesome food whether eaten raw, steamed, cooked in chowders, or as stuffed quahogs. More than a dozen methods and types of gear havebeen used in the last two centuries for harvesting quahogs. They include treading and using various types of rakes and dredges, both of which have undergone continuousimprovements in design. Modern dredges are equipped with hydraulic jets and one type has an escalator to bring the quahogs continuously to the boats. In the early 1900’s, most provinces and states established regulations to conserve and maximize yields of their quahog stocks. They include a minimum size, now almost universally a 38-mm shell width, and can include gear limitations and daily quotas.The United States produces far more quahogs than either Canada or Mexico. The leading producer in Canada is PrinceEdward Island. In the United States, New York, New Jersey, and Rhode Island lead in quahog production in the north, while Virginia and North Carolina lead in the south. Connecticut and Florida were large producers in the 1990’s. The State of Campeche leads in Mexican production. In the northeastern United States, the bays with large openings, and thus large exchanges of bay waters with ocean waters,have much larger stocks of quahogs and fisheries than bays with small openings and water exchanges.Quahog stocks in certifi ed beds have been enhanced by transplanting stocks to them from stocks in uncertified waters and by planting seed grown in hatcheries, which grew in number from Massachusetts to Florida in the 1980’s and 1990’s.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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  • 10
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    In:  http://aquaticcommons.org/id/eprint/9829 | 403 | 2012-08-16 14:23:16 | 9829 | United States National Marine Fisheries Service
    Publication Date: 2021-06-25
    Description: Honduras has many communities of artisanal fishermen who land various species of crustaceans and mollusks, using hands, nets, traps, and free diving from shore and from dugout canoes. It also has industrial fisheries for spiny lobster, Panulirus argus; queen conch, Strombus gigas; and mainly pink shrimp, Penaeus notialis, using traps, scuba divers, and trawl nets.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
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    Format: 33-44
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