The Effect of Five Stocking Densities on Growth and Yield of Red Swamp Crawfish <i>Procambarus clarkii</i>

Lutz, C. Greg; Wolters, William R.

doi:10.1111/j.1749-7345.1986.tb00551.x

Cited by 52 publications

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“…The effect of stocking density on crustacean production has been extensively studied in the context of commercial aquaculture. Most of these studies have found the growth rate to be inversely related to stocking density, even when food was not a limiting factor (Lutz & Wolters 1986, D'Abramo et al1989, NaranjoPáramo et al 2004. The 3 locations we surveyed exhibited different population densities.…”

Section: Discussionmentioning

confidence: 99%

Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA

Bosley¹,

Dumbauld²

2011

Mar. Ecol. Prog. Ser.

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Determining age in crustaceans is inherently imprecise because they molt periodically and do not retain hard structures throughout their lifespan. Morphological measurements are often used to estimate age, but variability in individual growth rate and molt frequency can result in a wide distribution of sizes in a single age class, making size a poor predictor of true age. Concentration of the autofluorescent age pigment, lipofuscin, has been shown to be directly related to actual age in many crustaceans. The present study assessed the potential of using extractable lipofuscin as a method for determining age in the ghost shrimp Neotrypaea californiensis. Following validation of the technique, lipofuscin-based aging was used to determine age structures for 3 populations of N. californiensis, and these were compared to age structures determined using traditional lengthbased methods. Analysis of lipofuscin revealed up to 13 age classes where the size-based analysis showed only 7. Comparison of mean size-at-age among populations in Oregon and Washington estuaries demonstrated that growth rate varied spatially, probably responding to site-specific environmental factors like food availability and population density. N. californiensis negatively impact oyster aquaculture in Pacific Northwest estuaries. Analysis of extractable lipofuscin proved to be a more accurate method of age determination than body-length measurements and should facilitate more indepth investigations of basic biological and ecological processes, which will benefit current efforts to develop an integrated pest management plan for N. californiensis.

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Section: Discussionmentioning

confidence: 99%

Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA

Bosley¹,

Dumbauld²

2011

Mar. Ecol. Prog. Ser.

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“…Several authors have studied the effect of stocking density under rearing conditions in Australian species (Geddes, Smallridge, & Clark 1993;Morrissy, Bird, & Cassels 1995;Whisson 1995), the red crayfish Procambarus clarkii (Lutz & Wolters 1986;McClain 1995) and the white crayfish Pascifastacus leniusculus (Westman 1973;Mason 1979). However, there have not yet been any density and growth rate studies for Cambarellus montezumae.…”

Section: Introductionmentioning

confidence: 99%

Effect of Density on Growth and Feeding of the CrayfishCambarellus montezumae(Saussure, 1857)

Arredondo‐Figueroa

Vásquez-González

Barriga-Sosa

et al. 2010

Journal of Applied Aquaculture

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The acocil C. montezumae is a freshwater crayfish endemic to the Central Plateau of Mexico, but, in recent years, the natural population of this species has diminished considerably. In this work was investigated growth performance and feeding of this crayfish reared at high densities. A random block experimental design with two repetitions and three treatments (77, 154 and 231 crayfish/m 2 ) was carried out. Organisms were fed every third day with 15% of their total biomass of shrimp commercial food with 25% of crude protein, and individual food consumption (IFC) was calculated. Significant differences (ANOVA, P < 0.05) were detected in final weight, absolute increase, relative rate of increase, instantaneous rate of increase, yield and survival rate between the densities, with those reared at a density of 77 organisms/m 2 reaching the largest sizes. There were no-significant differences (P > 0.05) among treatments in terms of initial weight, specific growth rate and feed conversion l rate.

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“…Data were expressed as mean ± SD and analyzed using One-way ANOVA followed by Duncan's multiple-range test (Lutz et al, 2007). A value of p＜0.05 was considered as statistically significant.…”

Section: Discussionmentioning

confidence: 99%

Effects of Urechis unicinctus juveniles on chemical characteristics of organically contaminated coastal sediment

Kang

Zhang

Kim

et al. 2010

J. Ocean Univ. China

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Biological activities of marine benthos such as burrowing and feeding may change sediment characteristics. We conducted three experiments to examine the potential of using juveniles of a spoon worm Urechis unicinctus to improve the quality of organically contaminated coastal sediment. Sediment samples were collected from a site that was heavily contaminated with organic matter (Seonso) and two sites that were clean (Myo-do, Dolsan-do). Urechis juveniles, obtained by artificial fertilization and cultured in the laboratory, were introduced to the sediment (weight 3 kg, depth 10 cm) at a density of 500 individuals per aquarium (length 50 cm, width 35 cm, height 30 cm) (Experiment 1), or at densities ranging from 100 to 900 individuals per beaker (Experiment 2). To examine how sediment contamination can be modified by the effects of Urechis, 500 individuals (per aquarium) were exposed to the Seonso contaminated sediment that had been mixed with 0−100% clean sand (Experiment 3). Each experiment lasted two months and sediment samples were collected every 15 d to determine the several indexes of sediment quality, which included acid volatile sulfide (AVS), chemical oxygen demand (COD) and total ignition loss (TIL). In Experiment 1, the existence of Urechis did not result in significant changes in quality indexes in the sediments collected from Myo-do, Dolsan-do. However, AVS, COD and TIL of the Seonso sediment all decreased significantly after co-incubation with Urechis juveniles for 30 to 45 d. Experiment 2 showed that a density of at least 300 juveniles per beaker was necessary to significantly reduce all three quality indexes, and the magnitude of reduction was positively correlated with juvenile density. Experiment 3 revealed that Urechis juveniles were effective in reducing the AVS, COD and TIL of the Seonso sediment that had been mixed with 60%, 80%, and 80% of clean sand, respectively. The results of the present study therefore indicated that juveniles of this spoon worm have the potential to be used to improve the quality of organically contaminated sediment in coastal waters.

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The Effect of Five Stocking Densities on Growth and Yield of Red Swamp Crawfish Procambarus clarkii

Cited by 52 publications

References 0 publications

Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA

Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA

Effect of Density on Growth and Feeding of the CrayfishCambarellus montezumae(Saussure, 1857)

Effects of Urechis unicinctus juveniles on chemical characteristics of organically contaminated coastal sediment

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The Effect of Five Stocking Densities on Growth and Yield of Red Swamp Crawfish Procambarus clarkii

Cited by 52 publications

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Use of extractable lipofuscin to estimate age ­structure of ghost shrimp populations in west coast estuaries of the USA

Use of extractable lipofuscin to estimate age ­structure of ghost shrimp populations in west coast estuaries of the USA

Effect of Density on Growth and Feeding of the CrayfishCambarellus montezumae(Saussure, 1857)

Effects of Urechis unicinctus juveniles on chemical characteristics of organically contaminated coastal sediment

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Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA

Use of extractable lipofuscin to estimate age structure of ghost shrimp populations in west coast estuaries of the USA