Aquaculture and Fisheries Commons^™

Vertical Distribution Of Walleye Pollock Juveniles Before And After The Period Of Transition For Feeding In Funka Bay, Hokkaido, Japan, Yohei Kawauchi, Osamu Shida, Hiroya Okumura, Naoki Tojo, Hiroki Yasuma, Kazushi Miyashita

Journal of Marine Science and Technology–Taiwan

We examined the vertical distributions of walleye pollock Theragra chalcogramma juveniles for two size groups (smaller and larger than 30 mm) during the period of transition for feeding (PTF) and after this period in Funka Bay, Hokkaido, Japan. Samplings were conducted in May and June in 2006 and 2007, and water temperature and salinity were measured. The correlation between juvenile sizes and distributed depth was observed using net sampling. From this result, size groups were divided by depth. In addition, the distribution and abundance of juveniles were examined using acoustic data. In the PTF (May), juvenile size increased with increasing …

In Situ And Ex Situ Target Strength Measurement Of Mesopelagic Lanternfish, Diaphus Theta (Family Myctophidae), Kouichi Sawada, Kazuhisa Uchikawa, Tomohiko Matsuura, Hiroya Sugisaki, Kazuo Amakasu, Koki Abe

Journal of Marine Science and Technology–Taiwan

Acoustic target strengths (TS) of myctophid fish Diaphus theta were measured in situ at 70 kHz off the east coast of Hokkaido by tethering an acoustic-optical system (the Japanese Quantitative Echosounder and Stereo-video Camera System or J-QUESTχ) at a depth of 150 m from a research vessel. Fish length distributions were obtained from daytime hauls taken with a frame trawl after the TS measurement. Measured average TS () and a standard length (SL) in cm gave the empirical length - average TS relationship, = 20logSL70.6, assuming that the linear TS is proportional to the square of the SL. A laboratory …

Analysis Of The Me70 Multibeam Echosounder Data In Echoview??Urrent Capability And Future Directions, Myounghee Kang

Journal of Marine Science and Technology–Taiwan

The general features of the multibeam echosounder (Simrad, ME70) are covered and trends in recent research on using the sonar systems are stated. Echoview's current capability for analyzing ME70 data is precisely described in two categories: split beam data analysis and multibeam data analysis. In particular, the visualization and analysis of school in three dimensions and school tracking are illustrated using fish school echoes observed in Bering Sea during the summer of 2008 and 2009. Future software developments in Echoview may include: high resolution bathymetric algorithms to detect reliable sea bottom, advanced school detection in three dimensions even for ambiguous …

An Alignment Approach To Identify Fish With Encoding Hydroacoustic Signal To Acoustics Alphabet Squences, Shih-Yen Ku, Hsueh-Jung Lu, Chi-Ting Tseng, Ker-Chau Li, Long-Jin Wu

Journal of Marine Science and Technology–Taiwan

1D sequence homologous alignment tool, like FastA (FASTALL) [8] or BLAST (Basic Local Alignment Search Tool) [1], has been widely used in bioinformatics field and perform elegant and fast searching for the sequences developed from the same kinds of species. In other word, it can classify through determining the homologous similarity which is not totally similar in sequences of protein sequences, structure or nucleotide sequences. An approach is proposed in this paper called AA-FAST (abbreviation for Acoustics Alphabet-FAST) which takes advantage of alignment tool and significant sequence encoding method. In this experiment, it could not only determine 4 fish species …

Measurement And Modeling Of Three Dimensional Target Strength Of Fish For Horizontal Scanning Sonar, Muhammad Kurnia, Kohji Iida, Tohru Mukai

Journal of Marine Science and Technology–Taiwan

This paper discusses the three-dimensional target strength (3DTS) of fish for a horizontal scanning sonar. Experiments were conducted in a tank using a defrosted Japanese mackerel. Measurements were made by changing the horizontal incident angle of a 50 kHz acoustic beam and the pitch angle of a tethered fish. Following the experiment, morphological characteristics, including the swimbladder size and shape, were measured using soft X-ray and digitized. The theoretical 3DTS was estimated using the prolate spheroid model and compared with the measured 3DTS. Results showed that the TS strongly depended on the fish orientation. The maximum and minimum TS were …

Spatial Estimation Of Euphausiid Biomass Along The Pacific Coast Of Eastern Hokkaido, Japan In Early Summer Of 2008, Naoki Tojo, Kenji Minami, Ryuichi Matsukura, Yohei Kawauchi, Tetsuichiro Funamoto, Masayuki Chimura, Akira Nishimura, Kazushi Miyashita

Journal of Marine Science and Technology–Taiwan

This study focused on euphausiid distribution and biomass estimation over the coastal shelf of the Pacific coast of Hokkaido Japan in early summer 2008. Acoustic data were obtained in both day (6:00-18:00) and night (18:00-6:00) using a quantitative echosounder (EK60, Simrad) with two frequencies (120 and 38 kHz). Echoes of euphausiids were specified based on the ΔMVBS, calculated with seasonal theoretical target strength of Euphausia pacifica. The best-fit kriging models were used to quantitatively interpolate euphausiid distribution. The detected euphausiid biomass reached 38,278 t (> 15 gWWm-2), suggesting abundant prey for large fishes over study area. On the other hand, …

Rna Interference In Marine And Freshwater Sponges: Actin Knockdown In Tethya Wilhelma And Ephydatia Muelleri By Ingested Dsrna Expressing Bacteria, Ajna S. Rivera, April L. Hill, Et. Al.

Biology Faculty Publications

Background: The marine sponge Tethya wilhelma and the freshwater sponge Ephydatia muelleri are emerging model organisms to study evolution, gene regulation, development, and physiology in non-bilaterian animal systems. Thus far, functional methods (i.e., loss or gain of function) for these organisms have not been available.

Results: We show that soaking developing freshwater sponges in double-stranded RNA and/or feeding marine and freshwater sponges bacteria expressing double-stranded RNA can lead to RNA interference and reduction of targeted transcript levels. These methods, first utilized in C. elegans, have been adapted for the development and feeding style of easily cultured marine and freshwater poriferans. …

Developing Mechanisms For The Transfer And/Or Adjustment Of Rock Lobster Shares Between Sectors In Western Australia And South Australia., Chris Reid

Fisheries Management Papers

The purpose of this report has been to investigate potential reallocation mechanisms for the transfer and/or adjustment of catch shares between sectors and the requirements to allow for their implementation, with particular reference to their application in the Western and South Australian rock lobster fisheries. While the report focuses on the commercial and recreational sectors of these fisheries, potentially all non-commercial fishing sectors could be included under a given mechanism in the same manner as that outlined for the recreational sector, subject to the appropriateness of allowing the sector’s allocation to be transferable

Developing Mechanisms For The Transfer And/Or Adjustment Of Rock Lobster Shares Between Sectors In Western Australia And South Australia, Department Of Fisheries

Fisheries Management Papers

No abstract provided.

Assessing Anglers Identification Of Common Fish Species Of Nebraska, Jason Reed

Department of Environmental Studies: Undergraduate Student Theses

Creel surveys, also known as angler surveys, entail individual interviews with anglers.  The interviews include a variety of questions pertaining to their fishing trip on that particular day. The interviewer asks the angler questions that include, but are not limited to what species they caught that day, the size of the fish, how many hours they spent fishing that day, what bait they were using, etc. If the angler does not know the species caught or misidentifies the species there is the potential for the recorded data to negatively impact management techniques that rely on the creel survey data.                                                                                                        One …

Policy Analysis For Optimizing Native Fisheries On The Mckenzie River, Mary Ray

Environmental Science and Management Professional Master's Project Reports

The impact of hatchery fish on native populations has been extensively studied, especially as environmental management has generally moved toward a conservation focus. In Oregon, the McKenzie River native rainbow trout population has been the focus of recent interest groups attempting to induce a change in management practices to support native fisheries. The McKenzie River Chapter of Trout Unlimited is interested in learning more about the impacts that hatchery stocked rainbow trout have on native river populations. It is the group's intent to seek a rule change to management by the Oregon Department of Fish and Wildlife. A review of …

Western Rock Lobster Puerulus Workshop, Department Of Fisheries

Fisheries Occasional Publications

No abstract provided.

The Aquarium Trade As An Invasion Pathway In The Pacific Northwest, Angela L. Strecker, Philip M. Campbell, Julian D. Olden

Environmental Science and Management Faculty Publications and Presentations

The aquarium trade moves thousands of species around the globe, and unwanted organisms may be released into freshwaters, with adverse ecological and economic effects. We report on the first investigation of the ornamental pet trade as an invasion pathway in the Pacific Northwest region of the United States, where a moderate climate and a large human population present ample opportunities for the introduction and establishment of aquarium trade species. Results from a regional survey of pet stores found that the number of fish (n=400) and plant (n=124) species currently in the aquarium trade is vast. Pet stores import thousands of …

Accumulation Of Polonium-210 In Different Species Of Fish In Lake Mead, Suraj Ghevarghese John, Shungmugam Nallaperumal, Vernon Hodge

Festival of Communities: UG Symposium (Posters)

Discovered by Pierre Curie and Marie Skłodowska-Curie in 1898, polonium is a chemical element with an atomic number of 84. This rare naturally occurring radioactive element is chemically similar to bismuth and tellurium, and forms in uranium ores. Polonium-210 is an naturally occurring radioactive element with a half-life of 138.376 days(1). This element is found in trace amounts in most organisms. Our research is focused on the accumulation of polonium-210 in fish that occupy in Lake Mead.

The sample species is chosen based on varying lake stratification (layers of the lake). This gives us a good idea of the difference …

Morphological Variation Between Juvenile White Bass And Juvenile Hybrid Striped Bass, Ryan W. Lueckenhoff

School of Natural Resources: Dissertations, Theses, and Student Research

While identifying recruitment bottlenecks for white bass Morone chrysops, we encountered difficulty distinguishing between age-0 white bass and age-0 hybrid striped bass M. saxatilis x chrysops. Accurate identification of juvenile white bass and hybrid striped bass will improve the quality of data gathered for research and monitoring efforts. The first objective of this study was to estimate biologists’ accuracy identifying juvenile white bass and juvenile hybrid striped bass, and to determine which characteristics biologists were using during identification. Overall, identification accuracy was 71%. Biologists who placed less emphasis using the characteristic "broken horizontal lines" or who examined >99 …

La Crosse Fish Health Center Onalaska, Wisconsin

United States Fish and Wildlife Service: Publications

The La Crosse Fish Health Center (Center) is located in Onalaska, Wisconsin in the southwest corner of the state bordering the Mississippi River. The Center is one of nine fish health laboratories operated by the U.S. Fish and Wildlife Service to serve the National Fish Hatchery System. The Center was established in 1962 and moved to its current facilities in 1995. The staff consists of eight permanent w/ 1 vacancy, 4 experience program students, and 2 student volunteers.

As an aquatic animal health laboratory, the Center services include health inspections, diagnostics, training opportunities, and technical information exchange to five Regional …

Jackson National Fish Hatchery Restoring America's Fisheries

United States Fish and Wildlife Service: Publications

Jackson NFH was originally established in 1950 as part of the Palisades Dam Act. Today, the hatchery’s primary emphasis is producing eggs and fish to mitigate for fish losses from Federal water development projects and for Tribes, States, and research facilities. The 40 acre Jackson NFH station is located on the USFWS National Elk Refuge. The hatchery rears native Snake River cutthroat trout for a distribution area that covers close to 18,000 square miles. The facility is also part of the USFWS National Broodstock Program.

Carterville Fishery Resources Office

United States Fish and Wildlife Service: Publications

Carterville Fishery Resources Office (FRO) was established in 1981 and is located at the Crab Orchard National Wildlife Refuge in Marion, Illinois. The office provides fishery management assistance to other Fish and Wildlife Service offices, federal and state agencies, and Department of Defense military bases in Illinois, Indiana, Missouri, and Ohio. Carterville FRO accomplishes its mission of conserving, enhancing, and protecting fish and aquatic ecosystems by working with partners.

Carterville FRO, in partnership with the Columbia FRO, assists the 28 states of the Mississippi Interstate Cooperative Resource Association (MICRA) with a basin-wide paddlefish stock assessment. Carterville FRO has operated a …

The Quest For Fisheries Sustainability: Age, Growth And Maturity Of Golden Trevally (Gnathanodon Speciosus) In Australia, Elise Koob

Inquiry Journal 2011

No abstract provided.

Assessing Possible Environmental Causes Behind The Reduced Colonisation Of Western Rock Lobster Puerulus Collectors By A Wide Suite Of Species. Frdc Report : Project 2008/085, Simon De Lestang, Jason How, Shelley Foster

Fisheries Research Reports

Objectives 1) Begin monitoring the community composition of marine flora and fauna along the Western Australian coastline during this current poor settlement period. 2) Develop standard methodology for monitoring the spatial and temporal variability in the settlement of marine flora and fauna. 3) Determine what environmental parameters may be linked to the majority of variation in the floral and faunal communities colonizing puerulus collectors, focusing on those relating to puerulus settlement. 4) Identify indicator marine flora and fauna species for monitoring the influences of environmental change on Western Australian marine environment. 5) Detect any known or potential introduced marine pests …