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The history of channel catfish farming in the United States serves as a model for the development of pond-based aquaculture industries worldwide. Channel catfish farming is the largest and economically most important aquaculture industry in the United States. In 2003, over 300,000 metric tons (662 million pounds) of channel catfish were processed, representing about half the total United States aquaculture production. Demand for farm-raised catfish is strong, with record processing years in 2002 and 2003. In 22 chapters written by active scientists in the field, Biology and Culture of Channel Catfish comprehensively synthesizes over 30 years of research on this American icon. Throughout the book, fundamental biological aspects of channel catfish are linked to practical culture techniques. Topics include: • Latest information on reproductive physiology, genetics, and breeding • Comprehensive treatment of catfish nutrition, feeds, and feeding practices • Water quality management and pond dynamics • In-depth review of immunology in channel catfish • Practical information on diseases and health management • Techniques for commercial culture, including innovative techniques such as raceways, recirculating systems, and partitioned aquaculture systems • Catfish economics and marketing • Exploration of environmental concerns, including recommended Best Management Practices
Although aquaculture as a biological production system has a long history, systematic and efficient breeding programs to improve economically important traits in the farmed species have rarely been utilized until recently, except for salmonid species. This means that the majority of aquaculture production (more than 90 %) is based on genetically unimproved stocks. In farm animals the situation is vastly different: practically no terrestrial farm production is based on genetically unimproved and undomesticated populations. This difference between aquaculture and livestock production is in spite of the fact that the basic elements of breeding theory are the same for fish and shellfish as for farm animals. One possible reason for the difference is the complexity of reproductive biology in aquatic species, and special consideration needs to be taken in the design of breeding plans for these species. Since 1971 AKVAFORSK, has continuously carried out large scale breeding research projects with salmonid species, and during the latest 15 years also with a number of fresh water and marine species. Results from this work and the results from other institutions around the world have brought forward considerable knowledge, which make the development of efficient breeding programs feasible. The genetic improvement obtained in selection programs for fish and shellfish is remarkable and much higher than what has been achieved in terrestrial farm animals.
Vampire bats that regurgitate blood for roosting buddies. Mosquitoes that filch honeydew droplets from ants. Reptiles that enforce chastity on their lovers with copulatory plugs. Capuchin monkeys that use millipede secretions as mosquito repellent. The natural world is full of unusual relationships, and negotiation between life-forms striving to survive is evolution at its most diverse, entertaining, and awe-inspiring. Picking up where her highly popular Headless Males Make Great Lovers left off, tropical field biologist Marty Crump takes us on another voyage of discovery into the world of unusual natural histories, this time focusing on extraordinary interactions involving animals, plants, fungi, and bacteria. Sexy Orchids Make Lousy Lovers& Other Unusual Relationships illuminates the ceaseless give-and-take between species. Occasionally, both interacting parties benefit, like when hornbills and dwarf mongooses hunt together for food. Other times, like when mites ride in hummingbirds’ nostrils to reach their next meal of nectar, one individual benefits and the other is neither helped nor harmed. But sometimes one individual benefits at the expense of the other; you need only recall your last sinus infection to understand how that works. Throughout, Crump brings her trademark spunk and zest to these stories of intimate exchange. She introduces readers to penguins that babysit, pseudoscorpions that ride and mate under the wings of giant harlequin beetles, and parasitic fungi that bend insects to their will. A lively companion to Crump’s earlier work, Sexy Orchids Make Lousy Lovers& Other Unusual Relationships captures the bizarre and befuddling aspects of the behavior of animals, plants, and microbes. After this entertaining romp through the world of natural relationships, you’ll never look at an orchid the same way again.