Download or read book Settlement and Postlarval Ecology of the Red Abalone Haliotis Rufescens in Culture Systems written by and published by . This book was released on 1999 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies on abiotic and biotic factors that may influence metamorphosis induction and early postlarval survival and growth of the abalone Haliotis rufescens (Mollusca: Gastropoda) in culture systems were conducted. The availability of appropriate cues for metamorphosis induction is crucial. The conventional cue provided in abalone culture (diatom films) is inadequate for this species. This study shows, for the first time, that the gamma-aminobutyric acid (GABA) can be used successfully in massive-scale conditions. Metamorphosis induction by this amino acid was 75-76% (after 24 h) while only 8-12% larvae responded to diatom films. Bacterial interference can be minimized by exposing larvae to GABA in clean tanks and adding diatoms (and associated bacteria), as a postlarval food, after metamorphosis is induced. Alternatively, the conventional GABA concentration (1 micromolar) may be increased within safe limits (up to 2-3 micromolar) to cope with potential degradation of the amino acid by bacteria. Another important factor is the timing of settlement, since a suboptimal induction occurred in precompetent larvae or after a prolonged delayed metamorphosis. However, a maximum response to GABA and increased early postlarval development were observed for larvae settling 1-3 days after the onset of competence. Although GABA is now routinely used to improve settlement in many H. rufescens hatcheries, high mortality or slow postlarval growth are still common. Ecological conditions in the benthic boundary layers above diatom-films of culture systems may play an important role on postlarval fitness. Oxygen microgradients within 1 mm above biofilm surfaces were observed in laboratory studies, with bottom levels higher than 180% or lower than 50% saturation in light and dark conditions, respectively. Reduced postlarval survival and growth can also result from the depletion of biofilms after excessive grazing. Thus, information on grazing rates and the factors controlling them is crucial for the optimal management of culture systems. This contribution provides the first estimates of grazing rates of H. rufescens postlarvae, based on the digital analysis of video-recorded images, ranging from 20 to 724 diatom cells/individual/hour during the first month after settlement.
Download or read book The Relative Effects of Diet and Irradiance on the Growth and Survival of Post larval Red Abalone Haliotis Rufescens written by Susan C. McBride and published by . This book was released on 1990 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Shellfish Research written by and published by . This book was released on 2007 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Ocean Acidification on the Growth and Survival in Early stage Red Abalone Haliotis Rufescens written by Sara Elizabeth Boles and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The shellfish aquaculture industry has been identified as a sustainable source of protein to feed a growing global population. Absorption of carbon dioxide (CO2) by the world's oceans is leading to a decline in ocean pH, resulting in process termed ocean acidification (OA), and is occurring at an unprecedented rate. The result of OA has reduced global surface oceans by 0.1 pH units and is projected to decrease by 0.3 to 0.4 pH units by the year 2100. The negative consequences of OA have been shown to reduce calcification, growth, and survival during sensitive larval and post-settlement life-history stages in both ecologically and economically important species of shellfish. The consequences of OA are threatening the viability of these economically and ecologically important resources; however, few adaptive aquaculture strategies exist to mitigate the negative effects of OA. Red abalone (H. rufescens) are a culturally, ecologically, and economically important species of shellfish, yet few studies have investigated the effects of OA across sensitive life-history stages and adaptive culture strategies for this species are absent. To address these gaps in knowledge during sensitive larval and post-settlement stages with the following objectives we examined: (1) the mitigative effect of post-settlement diet in wild-caught (VD: Van Damme, CA) and captive (SB: Santa Barbara, CA) populations of red abalone exposed to OA conditions; and (2) the capacity of seawater chemistry manipulations and the tailoring post-settlement and grow-out temperatures during sensitive stages to buffer the negative carry-over effects of OA into later life-history stages. To test the OA-buffering effect of natural (CCA: crustose coralline algae) and commercially grown (NV: Navicula sp. Diatoms) post-settlement diets on the survival of wild-caught and captive populations of red abalone, embryos were cultured from 6 hours post-fertilization to 97 days post-fertilization (dpf) under either control-pH or OA treatment conditions. We found that CCA enhanced post-settlement survival in both populations under both control-pH and OA treatment conditions compared to abalone settled on NV diatoms; however, this effect remained significant only in the SB population at later post-settlement stages. Variation in response to pH treatment conditions was observed between the two populations with SB abalone displaying a considerable decline in post-settlement survival when cultured under OA conditions, whereas, survival of VD-sourced abalone was not affected by OA. We also observed a significant effect of settlement diet on the relationship between total larval lipids stores and post-settlement survival, a relationship that was more pronounced in VD compared to SB abalone. To assess the mitigative capacity of pH manipulations to buffer the negative consequence of OA, we cultured red abalone from embryos (6 hours post-fertilization) to 7 dpf under control-pH or OA conditions and were settled under a factorial combination of these treatments. Post-settlement and grow-out temperatures were tailored to enhance the growth of abalone cultured under the various pH treatment conditions. Slight warming during post-settlement and grow-out stages enhanced the growth of red abalone; however, this effect was dependent on pH treatment exposure history. Results from this dissertation reveal the effects of OA across larval and post-settlement stages in red abalone are complex; however, they highlight the potential for adaptive culture techniques to sustain and advance red abalone conservation and production aquaculture in the face of ocean change.
Download or read book Effects of Predation and Settlement Substrate Choice on the Post settlement Survival of Red Abalone Haliotis Rufescens written by Clara Maria Svedlund and published by . This book was released on 2006 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Larval Settlement and Juvenile Survival in the Red Abalone Haliotis Rufescens written by M. Slattery and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abalone written by Peter A. Cook and published by Academic Press. This book was released on 2023-07-13 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abalone: Biology, Ecology, Aquaculture and Fisheries, Volume 44 in the Developments in Aquaculture and Fisheries Science series, describes the taxonomy of more than 50 abalone species worldwide. The content contains information on the biology, physiology and ecology of each species as well as reproduction, genetics, diseases and parasites. It includes abalone fisheries in different parts of the world, detailing abalone aquaculture in China, Japan, Korea, Australia, Europe and Western North America. This reference takes a comprehensive approach to understanding overall shellfish management, making it valuable to fisheries, marine biologists and researchers studying shellfish, aquaculture and the ocean environment. This will also be a great resource for government and academia professionals interested in aquaculture and fisheries and their sustainable futures. Includes the newest information on diseases and parasites, marine contaminants, genetics, population dynamics and more, with extensive reference lists provided for each chapter Addresses the full scope of aquaculture expansion and issues surrounding sustainability and production and the newest observations in marine contaminants and effects on abalone production Includes the most recent advances in research and the newest developments in industry by top world experts
Download or read book Settlement and Metamorphosis of Red Abalone Haliotis Rufescens Larvae written by Marc Slattery and published by . This book was released on 1987 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2000 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Abalone of the World written by S. A. Shepard and published by Wiley-Blackwell. This book was released on 1992-07-27 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume contains some sixty papers and reviews presented at the First International Symposium on Abalone Biology, Fisheries and Culture held in La Paz, Mexico. Introductory reviews in the book focus on the evolutionary origin, radiation and modern relationships of the genus Haliotis. Further papers review aspects of the reproductive process, larval energetics, mechanisms of larval settlement, and the ecology of settlement. Feeding deterrents and attractants, and the relation between food and growth are reviewed in a later section of authoritative papers. The natural mortality of abalone and its causes, predators and diseases are thoroughly reviewed. Several papers summarise information on the withering syndrome afflicting black abalone in California. A series of excellent papers and reviews then consider the problems of managing abalone fisheries. The models used are reviewed and examples given of the application of models to specific fisheries. Further papers provide new information on stock enhancement and the book concludes with case studies of the eight major abalone fisheries of the world with a review of the management of each. The book is divided into eight sections as follows: Part I - Evolution and distributuion. Part II - Physiology, genetics, reproduction. Part III - Larval ecology and settlement. Part IV - Feeding, growth. Part V - Marketing, disease and predators. Part VI - Fishery biology, modelling. Part VII - Case studies of fisheries. Part VIII - Culture.
Download or read book Red Abalone Haliotis Rufescens Relative Impacts of Recreational Fisheries and Sea Otter Predation on the Abundance Size Frequency and Microhabitat Distribution of Red Abalone Populations in Central and Northern California written by Samantha Pollard and published by . This book was released on 1992 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Invertebrate Reproduction Development written by and published by . This book was released on 2004 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Periphyton written by M. E. Azim and published by CABI. This book was released on 2005-11-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive monograph on periphyton, this book contains contributions by scientists fromaround the globe. Multi-disciplinary in nature, it covers both basic and applied aspects of periphyton,and is applicable worldwide in natural, extensive and intensive managed systems.Periphyton, as described in this book, refers to the entire complex of attached aquatic biota on submergedsubstrates, including associated non-attached organisms and detritus. Thus the periphyton communitycomprises bacteria, fungi, protozoa, algae, zooplankton and other invertebrates. Periphyton is importantfor various reasons: as a major contributor to carbon fixation and nutrient cycling in aquatic ecosystems;as an important source of food in aquatic systems; as an indicator of environmental change. It can alsobe managed to improve water quality in lakes and reservoirs; it can greatly increase aquaculture production;it can be used in waste water treatment.The book provides an international review of periphyton ecology, exploitation and management. Theecology part focuses on periphyton structure and function in natural systems. The exploitation part coversits nutritive qualities and utilization by organisms, particularly in aquaculture. The final part considersthe use of periphyton for increasing aquatic production and its effects on water quality and animal healthin culture systems. This book will help scientists and entrepreneurs further understand the ecology andproduction of aquatic systems and venture into new and promising areas.
Download or read book Evaluation of Artificial Diets for the Culture of Red Abalone Haliotis Rufescens written by Christine L. Jackson and published by . This book was released on 2000 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biology of the Red Abalone Haliotis Rufescens in Northern California written by Robert Thomas Leaf and published by . This book was released on 2005 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous Comparison of Methods for Settlement and Metamorphosis Induction in the Red Abalone Haliotis Rufescens written by R. Searcy-Bernal and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Settlement Behavior of Haliotis Rufescens Larvae After Exposure to Acidified Conditions written by Molly Sueko Gleason and published by . This book was released on 2014 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean acidification (OA) could potentially alter the interaction between settling invertebrate larvae and the settlement cue-producing crustose coralline algae (CCA). We hypothesized this arises from the impairment of larval cue detection and/or physiological changes to CCA. We examined the interaction between the larvae of the commercially valuable red abalone (Haliotis rufescens) and its preferred settlement substrata, CCA species Lithothamnium californicum, under high pCO2 conditions created to mimic future OA scenarios. CCA were exposed to high pCO2 conditions (treatment pH 0.2 ± 0.05 units lower than ambient) for 6 weeks and larvae were exposed during early development. Physiological studies were first conducted to determine whether high pCO2 directly impacts CCA growth and larval survival. Three unique orthogonal larval settlement experiments were performed to determine if larval substrate preference was affected by : 1) larval exposure to high pCO2, 2) CCA exposure to high pCO2, or 3) both organisms' exposure to high pCO2. My results show that 1) CCA suffered a reduction in net calcification, 2) four out of five trials did not reveal an impact of high pCO2 on abalone larval survival, 3) CCA exposure to high pCO2 did not affect larval settlement to CCA, 4) larval exposure to high pCO2 reduced settlement to CCA and 5) both organisms exposure to high pCO2 did not affect settlement. Larval survival and settlement responses were variable after larval exposure to high pCO2. This may have been a result of the conditions adult abalone were raised, adult fitness and possibly genetic adaptation to OA.
