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Louisiana Crawfish Production Manual

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Louisiana Crawfish Production Manual LOUISIANA CRAWFISH PRODUCTION MANUAL 1 Table of Contents Chapter 1. Introduction .......................1 History ......................................... 1 Additional Sources of Information ................ 3 Chapter 2. Crawfish Biology ....................4 Life Cycles ................................... 5 Burrow Ecology . 7 Population Dynamics .............................. 8 Molting . 8 Nutrition .................................... 9 Chapter 3. Crawfish Production Systems ........10 Monocropping Systems . 10 Crop Rotational Systems....................... 12 Chapter 4. Pond Location, Design and Construction 13 Location ....................................... 13 Design and Construction ...................... 13 Best Management Practices for Crawfish Pond Construction . 15 Chapter 5. Forages and Forage Management . .16 Monocropping Systems . 18 Rotational Cropping Systems ................... 20 Post-Flood Management of the Forage Crop ...... 21 Chapter 6. Stocking. .22 Species and Size. 22 Dates ...................................... 22 Habitat . 22 Handling . 23 Rates ...................................... 23 Sex Ratio and Condition of Broodstock........... 24 Post-stocking Recommendations ................ 25 Summary ................................... 25 Chapter 7. Water Quality and Management . .26 Water Supply and Quantity Required. 26 Water Quality ............................... 27 Management Considerations ................... 29 Best Management Practices ................... 30 Chapter 8. Harvest . .33 Factors Influencing Catch and Harvest Size ........ 33 Traps. 33 Baits ....................................... 34 Baiting Strategies . 34 Trapping Strategies ........................... 35 Harvesting Machinery . 36 Chapter 9. Other Management Considerations . .38 Pond Flood-up .............................. 38 Population Management ....................... 38 Supplemental Feeding ......................... 39 Managing for Larger Crawfish .................. 40 Diseases ................................... 43 Predators .................................. 44 Nuisance Wildlife. 45 Control Methods. 46 DevelopingYour Business . 47 Chapter 10. Markets and Marketing. .48 Product Forms............................... 48 Marketing Influences .......................... 49 Pricing . 50 Production Strategies for Identified Markets ....... 51 Regulations and Permits ....................... 51 Transport and Storage. 51 Purging and Cleaning ......................... 52 Grading . 53 Glossary ...................................54 Authors, Contributors, Acknowledgments .......57 NOTE: Mention or display of trade names or businesses in this publication does not constitute endorsement on the part of the LSU AgCenter, nor does it imply that other similar products or services are inferior or superior. Chapter 1. Introduction Whether from managed ponds or wild habitats, Loui- siana’s crawfish harvests are composed of two species – the red swamp crawfish (scientific name: Procambarus clarkii) and to a lesser extent the white river crawfish (scientific name: Procambarus zonangulus) (Fig- ure 1.1). Although scientists in other parts of the world use the term “crayfish” for these and all related species, in this manual Figure 1.1. Although they we refer to these two species are outwardly similar at as “crawfish” to reflect not just first glance, a number of their common names, but also characteristics distinguish the the widespread use of the word Figure 1.3. In some parts of Louisiana, semi-natural habitats are red swamp (left) and white by producers, marketers and impounded to allow for crawfish production through control of river crawfish (right). consumers in Louisiana and else- natural hydrological cycles. where in the United States. Louisiana’s crawfish farming industry has grown to include with hatchery-reared young as in other forms of aquaculture. more than 1,200 farms occupying more than 120,000 acres. Farmers rely on reproduction by unharvested crawfish from the Production from wild habitats, mainly the Atchafalaya River previous year or on mature crawfish that are stocked to produce basin, varies from year to year. Total production for the 2004- young naturally. 2005 season was more than 82 million pounds, with almost 74 Educational and technical assistance in all aspects of million pounds from farms and more than 8 million pounds har- crawfish production and marketing is provided by the LSU vested from natural habitats by approximately 1,100 fishermen. AgCenter through the Louisiana Cooperative Extension Service The farm-gate and dockside value of the 2004-2005 harvest in every parish. Help is available through individual consulta- exceeded $45 million. tion, on-farm visits, production meetings and publications Crawfish ponds have no standard size, but most are (Figure 1.4). Anyone considering going into crawfish farming between 10 and 40 acres, and most producers manage 150 should review current financial budgets available from the LSU or fewer acres (Figure 1.2). Occasionally, a single pond may AgCenter and discuss the feasibility of their projects or busi- include more than 1,000 acres, especially in bottomland areas ness plans with an extension professional who can identify the where water levels are manipulated in natural habitats for craw- best available data for making decisions as to how to proceed. fish production (Figure 1.3). Louisiana Cooperative Extension Service agents and specialists Formulated feeds are not used to produce crawfish. Instead, are the best source of information on the feasibility of farming rice, sorghum-sudangrass or natural vegetation is grown in crawfish in your area. the summer (when ponds are drained) to serve as the base of a natural food chain for crawfish. Crawfish ponds are not stocked History Profitability Varies Crawfish have been consumed for The profitability of crawfish centuries by Ameri- farming changes from year to can Indians and in year because of the variable many parts of Europe. supply of wild and farm- Commercial sales of raised crawfish, and resulting crawfish in Louisiana fluctuations in wholesale and began in the late 1800s. retail prices. As a result of the At that time, crawfish unpredictable yields from pond were harvested from to pond and year to year, few natural waters through- people make their living only out the southern region from farming crawfish. Overall of the state. The first production on a crawfish farm record of a commercial depends greatly on whether the crawfish harvest in crawfish are grown in rotation the United States was with rice or in permanent in 1880. That year, crawfish ponds and on the size a harvest of 23,400 and management level of those pounds was recorded, ponds. Breakeven prices vary Figure 1.2. Although there is no “standard” crawfish pond, a successful with a value of $2,140. greatly from farm to farm and in pond must be built on flat land that will hold water and support a By 1908, a U.S. Census different regions of the state. forage crop for the crawfish. 1 Crawfish Production Manual How are Crawfish Classified? Over the centuries, biologists have devised classification systems to represent groupings of animals and to better define where individual species fit within those groupings. With time, these systems have become more and more complicated, but this in turn provides more information about the relationships between species and groups of species. According to the most commonly accepted classification system, the red swamp crawfish and white river crawfish can be described as follows: Kingdom: Animalia (animals) Phylum: Arthropoda (crustaceans, insects, spiders, scorpions, etc.) Figure 1.4. Field faculty and state specialists with the LSU AgCenter Subphylum: Crustacea (crustaceans) are available to visit producers throughout the state. Class: Malacostraca (crabs, pill bugs — rollie-pollies, krill, and related species and groups) Order: Decapoda (meaning ten legs: lobsters, shrimp, report listed Louisiana’s crawfish production at 88,000 pounds, crabs, crayfishes — also called crawfishes, and relatives) with a value of $3,600. Sub-Order: Pleocyemata In the years following the Great Depression, crawfish Superfamily: Astacoidea (all crayfishes) sold for as little as 4 cents per pound. During this period, with Family: Cambaridae (cambarid crayfishes — one of three the development of improved transportation and cold storage, major groups of crayfish) crawfish markets within Louisiana shifted from local consump- Subfamily: Cambarinae (a group of North American tion in rural areas crayfish species, with more than 300 members) to higher-volume Genus: Procambarus markets in cities Subgenus: Scapulicambarus (for red swamp crawfish), such as Baton Ortmanicus (for white river crawfish) Rouge and New Species: clarkii (for red swamp crawfish), zonangulus (for Orleans. During white river crawfish, which was previously called acutus this same period, acutus for many years) the introduction of wire mesh craw- Scientists often refer to animals and plants by their genus fish traps provided and species classifications. Thus, the red swamp crawfish fishermen a much is referred to as Procambarus clarkii and the white river more efficient crawfish is Procambarus zonangulus. method of harvest (Figure 1.5). In 1950, the Louisiana Leg- areas, in other years crawfish were scarce and difficult to come islature funded by. This variation in supply made it difficult for markets to the Wildlife and grow, but once crawfish farming began, more consistent sup- Fisheries
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