The Effect of Soy-Based Diets on Weight Gain, Shell Hardness and Flavor of the American Lobster (<i>Homarus americanus</i>)

Donahue, Darrell W.; Bayer, Robert C.; Riley, John G.; Bushway, Alfred A.; Brown, Paul B.; Hazen, Russell A.; Mooer, Keith E.; Debruyne, Dorothy A.

doi:10.1300/j030v08n03_06

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Shell deposition.-Many marine invertebrates demonstrate the inducible defense of shell thickening in response to predator cues (Trussell and Smith 2000;Freeman and Byers 2006). Lobsters demonstrate a potential for this, as shell thickness varies in relationship to diet (Donahue et al 1999). Shell thickness is correlated to shell hardness (Donahue et al 1998), indicating that thicker shells may provide a better defense against predators.…”

Section: Support For the Host Susceptibility Hypothesismentioning

confidence: 99%

Host Susceptibility Hypothesis for Shell Disease in American Lobsters

Tlusty

Smolowitz

Halvorson

et al. 2007

Journal of Aquatic Animal Health

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Abstract.-Epizootic shell disease (ESD) in American lobsters Homarus americanus is the bacterial degradation of the carapace resulting in extensive irregular, deep erosions. The disease is having a major impact on the health and mortality of some American lobster populations, and its effects are being transferred to the economics of the fishery. While the onset and progression of ESD in American lobsters is undoubtedly multifactorial, there is little understanding of the direct causality of this disease. The host susceptibility hypothesis developed here states that although numerous environmental and pathological factors may vary around a lobster, it is eventually the lobster's internal state that is permissive to or shields it from the final onset of the diseased state. To support the host susceptibility hypothesis, we conceptualized a model of shell disease onset and severity to allow further research on shell disease to progress from a structured model. The model states that shell disease onset will occur when the net cuticle degradation (bacterial degradation, decrease of host immune response to bacteria, natural wear, and resorption) is greater than the net deposition (growth, maintenance, and inflammatory response) of the shell. Furthermore, lesion severity depends on the extent to which cuticle degradation exceeds deposition. This model is consistent with natural observations of shell disease in American lobster.

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Section: Support For the Host Susceptibility Hypothesismentioning

confidence: 99%

Host Susceptibility Hypothesis for Shell Disease in American Lobsters

Tlusty

Smolowitz

Halvorson

et al. 2007

Journal of Aquatic Animal Health

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“…These recently moulted lobsters are typically unsuitable for export as they are weak and easily damaged, which can reduce beach price by over $10/kg. Meat yield from newly moulted lobsters is lower (Donahue et al, 1999), which contributes to reduced market price and cannibalism of softer lobsters within holding tanks. To overcome these problems, processors request that fishers only retain lobsters of a certain degree of hardness.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)

Gardner

Musgrove

2006

Journal of Aquatic Food Product Technology

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Southern rock lobsters Jasus edwardsii that are about to moult or have recently moulted have reduced market value due to higher mortality in live transport, higher cannibalism and lower meat recovery. Limiting the landing of softer shelled lobsters is desirable to maintain product quality; however, attempts to set closed seasons or to introduce industry self-regulation have been hampered by subjectivity in measuring shell hardness. We evaluated the use of durometers as a tool for collecting objective measurements of shell hardness. Of the ten locations on the exoskeleton that were evaluated, two locations along the lateral suture line of the exoskeleton gave most consistent readings and underwent largest changes through the moult. The effects of several factors on durometer readings were evaluated: sex, temperature (ambient plus elevated 3°C), location (from around the coast), and size. No effect on durometer readings could be detected from any of these factors with the exception of lobster size. A cumulative logistic function fitted to grouped data provides a method for predicting time before or after moulting from

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Adding value to live, commercial size soft-shell clams (Mya arenaria L.) in Maine, USA: results from repeated, small-scale, field impoundment trials

Beal

2002

Aquaculture

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The Effect of Soy-Based Diets on Weight Gain, Shell Hardness and Flavor of the American Lobster (Homarus americanus)

Cited by 4 publications

References 11 publications

Host Susceptibility Hypothesis for Shell Disease in American Lobsters

Host Susceptibility Hypothesis for Shell Disease in American Lobsters

Quantifying Shell Hardness in the Southern Rock Lobster (Jasus edwardsii)

Adding value to live, commercial size soft-shell clams (Mya arenaria L.) in Maine, USA: results from repeated, small-scale, field impoundment trials

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