Quantifying Shell Hardness in the Southern Rock Lobster (<i>Jasus edwardsii</i>)

Gardner, Caleb; Musgrove, Richard

doi:10.1300/j030v15n02_03

Cited by 5 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the consumer, low abdominal muscle carbon content is likely to be associated with low meat yield, lower health benefit due to reduced omega-3 lipid, and possibly a reduction in quality attributes such as taste and texture [ 3 ]. Grading lobsters non-invasively on this basis may provide an opportunity to closely manage landings or live-holding duration in relation to the lobster capacity to withstand starvation, select poor quality lobsters for processing into frozen or cooked products, and/or attracting price premiums for lobsters with particular meat attributes that satisfy specific market demands [ 17 , 35 ].…”

Section: Discussionmentioning

confidence: 99%

Near-Infrared Spectroscopy as a Novel Non-Invasive Tool to Assess Spiny Lobster Nutritional Condition

2016

View full text Add to dashboard Cite

Rapid non-invasive monitoring of spiny lobster nutritional condition has considerable application in the established fishery, live market and prospective aquaculture. The aim of this research was to test the feasibility of near-infrared spectroscopy (NIRS) as a novel non-invasive tool to assess the nutritional condition of three lobster species. Lobster (n = 92) abdominal muscle dry matter (AMDM) and carbon content (AMC) correlated significantly with indices of nutritional condition including hepatopancreas dry matter (HPDM; rho = 0.83, 0.78), total lipid content (HPTL; rho = 0.85, 0.87) and haemolymph total protein (TP; rho = 0.89, 0.87 respectively). Abdominal muscle nitrogen content (AMN) was a poor correlate of nutritional condition. Models based on FT-NIR scanning of whole lobster tails successfully predicted AMDM, AMN and AMC (RMSECV = 1.41%, 0.35% and 0.91%; R2 = 0.75, 0.65, 0.77, respectively), and to a lower accuracy HPDM, HPTL and TP (RMSECV = 6.22%, 8.37%, 18.4 g l-1; R2 = 0.51, 0.70, 0.83, respectively). NIRS was applied successfully to assess the condition of spiny lobsters non-invasively. This pilot study paves the way for the development of crustacean condition models using portable non-invasive devices in the laboratory or in the field.

show abstract

Section: Discussionmentioning

confidence: 99%

Near-Infrared Spectroscopy as a Novel Non-Invasive Tool to Assess Spiny Lobster Nutritional Condition

2016

View full text Add to dashboard Cite

show abstract

“…Measurement of changes in the exoskeleton between moults has been undertaken through moult-staging of the cuticle [9,10], degree of carapace fouling [11], changes in radiometric isotope composition [12] or shell hardness [13,14]. …”

Section: Introductionmentioning

confidence: 99%

Determination of Moulting Events in Rock Lobsters from Pleopod Clipping

Gardner

Mills

2013

PLoS ONE

View full text Add to dashboard Cite

Rock lobster growth is routinely measured for research to optimise management measures such as size limits and quotas. The process of estimating growth is complicated in crustaceans as growth only occurs when the animal moults. As data are typically collected by tag-recapture methods, the timing of moulting events can bias results. For example, if annual moulting events take place within a very short time-at-large after tagging, or if time-at-large is long and no moulting occurs. Classifying data into cases where moulting has / has not occurred during time-at-large can be required and can generally be determined by change in size between release and recapture. However, in old or slow growth individuals the moult increment can be too small to provide surety that moulting has occurred. A method that has been used since the 1970’s to determine moulting in rock lobsters involves clipping the distal portion of a pleopod so that any regeneration observed at recapture can be used as evidence of a moult. We examined the use of this method in both tank and long-duration field trials within a marine protected area, which provided access to large animals with smaller growth increments. Our results emphasised that determination of moulting by change in size was unreliable with larger lobsters and that pleopod clipping can assist in identifying moulting events. However, regeneration was an unreliable measure of moulting if clipping occurred less than three months before the moult.

show abstract

“…There is much interest in developing physiological measures that correlate to health status in different species of lobster to better forecast diseases in wild populations (Balcom & Pearce 2005;Tlusty et al 2007), as well as determine quality of harvested animals (Ozbay & Riley 2002;Gardner & Musgrove 2006). Stressors such as pollution and water temperature can suppress lobster's ability to respond to pathogens, making it more likely that they will succumb to diseases such as gaffkemia (Sindermann 1990) or paramoebiosis (Balcom & Howell 2005).…”

Section: Introductionmentioning

confidence: 99%

A long‐term assessment of the physiological effects of herring (Clupea harengus) as a dietary component of the American lobster (Homarus americanus)

Myers

Tlusty²

2009

New Zealand Journal of Marine and Freshwater Research

View full text Add to dashboard Cite

Given the economic and ecological importance of American lobster (Homarus americanus) to the western North Atlantic, particular attention has been on factors that may increase susceptibility to disease. However, little focus has been on the possible role of dietary stress. There is strong evidence that wild lobsters feed on bait in traps, typically herring (Clupea harengus), yet evade capture. If the bait is nutritionally insufficient for lobsters, then the pervasive use of bait (up to 3 kg for each kg of lobster harvested) may compromise the health of lobsters, thus making them more susceptible to diseases. It has been shown previously that lobsters fed a diet solely of herring had higher incidences of shell disease and were less likely to survive than lobsters fed other diets. Here, physiological status including haemolymph protein, calcium, sodium, potassium and magnesium, hepatopancreas moisture and ash content, and the mineral constituents, thickness and hardness of the cuticle of lobsters fed 100% herring was compared to that of lobsters fed a diet consisting of rock crab (Cancer irroratus), blue mussel (Mytilus edulis) and Spirulina algae. An artificial diet, as well as paired combinations of the three diets were also included for comparison. Juvenile lobsters (approximately 1.25 years of age) were fed one of these six diets for c. 330 days. Diet most affected the cuticle minerals, and lobsters with increased incidence of shell disease had a lower Ca/P ratio. correlated to the previously observed disease and survival results, all physiological parameters tended to change with diet, and those lobsters fed herring overall increased haemolymph and cuticle mineral values and had lower shell physiological values than lobsters fed the other diets. These results suggest that rather than affecting lobsters via a single mechanism, nutritional stress is likely to impact a number of physiological variables, and thus make it difficult to assess health status through a single parameter.

show abstract

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

Cited by 5 publications

References 9 publications

Near-Infrared Spectroscopy as a Novel Non-Invasive Tool to Assess Spiny Lobster Nutritional Condition

Near-Infrared Spectroscopy as a Novel Non-Invasive Tool to Assess Spiny Lobster Nutritional Condition

Determination of Moulting Events in Rock Lobsters from Pleopod Clipping

A long‐term assessment of the physiological effects of herring (Clupea harengus) as a dietary component of the American lobster (Homarus americanus)

Contact Info

Product

Resources

About