Comparison of Methods for Determining Nutritional Condition in Spiny Lobsters

Gutzler, Benjamin C.; Butler, Mark J.

doi:10.2983/035.036.0118

Cited by 11 publications

(7 citation statements)

References 30 publications

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“…Of the 2267 total lobsters captured, 550 were also analyzed for determination of the hepatopancreas dry weight index (DWI; see Supplementary Tables S2 & S3 for breakdown by area). The DWI is considered a reliable indicator of nutritional condition, because the weight, which is a proxy for energy reserves, of the hepatopancreas decreases with starvation (Dall 1974, Gutzler & Butler 2017. Lobsters were euthanized within 24 h of capture, by rapid chilling on ice, Dissections were performed at the Florida Fish and Wildlife Conservation Commission South Florida Regional Laboratory in Marathon, FL, and each hepatopancreas was preserved in 95% ethanol for more than 24 h (Bryars & Geddes 2005, Gutzler et al 2015.…”

Section: Lobster Health Metricsmentioning

confidence: 99%

“…Hepatopancreases were dried at 60°C for 72 h, and the DWI was calculated via established formulae, one each for male and female lobsters (see Bryars & Geddes 2005 for generalized crustacean DWI formulae; see Gutzler et al 2015 for P. argus-specific formulae; our Table S1). Unlike BSP, hepatopancreas DWI is not affected by molt stage; however, DWI may be correlated to animal size (see Gutzler & Butler 2017); thus, lobster weight in grams was estimated from CL based on the morphometric relationship (Matthews et al 2003; our Table S1) and applied as a covariate in DWI analyses. Effect of sex on nutritional condition was visually evaluated via box plots (see Fig.…”

Section: Lobster Health Metricsmentioning

confidence: 99%

“…Hepatopancreas DWI and lobster BSP are gauges of physiological condition and served as indicators of the nutritional condition of a lobster. We compared and contrasted these 2 measures for each area and each time period to estimate lobster health variability (Dall 1974, Gutzler & Butler 2017, Butler et al 2018a. However, lobster health comprises more than just the 2 nutritional condition metrics that we have chosen (i.e.…”

Section: Lobster Health Metricsmentioning

confidence: 99%

“…stored lipids and proteins) have accumulated to the levels required for normal physiological function and growth (Moore et al 2000), and is generally measured as blood serum protein or a hepatopancreasbased index (e.g. Gutzler & Butler 2017). Factors that can influence nutritional condition include food availability (Barclay et al 1983, Moore et al 2000, Sánchez-Paz et al 2007, seasonal changes in feeding, growth, and reproduction (Rosa & Nunes 2003), and water chemistry (Ocampo et al 2003, Stoner et al 2010, Lorenzon et al 2011.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal and fishery impacts on the nutritional condition of the Caribbean spiny lobster Panulirus argus in Florida, USA

Butler

Ross

et al. 2022

Mar. Ecol. Prog. Ser.

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The sublethal effects of fisheries (e.g. reduced nutritional condition or injuries) on the target species population are poorly understood, yet have the potential to reduce fishery efficiency and sustainability. The Caribbean spiny lobster Panulirus argus trap fishery in Florida (USA) uses live, sublegal-size lobsters as bait to lure other lobsters into the ~462000 traps employed by the fishery. Long-term confinement of lobsters used as live bait causes stress, leading to the degradation of their nutritional condition or mortality; however, cumulative effects of confinement on nutritional condition throughout the fishing season and the effect on the population were unknown. We sampled sublegal- and legal-size lobsters hand-caught from a fished area (potentially affected by traps) and caught in commercial lobster traps in the fished area to determine how lobster health varies throughout the year and whether the intense recreational and commercial fisheries exhibit sublethal effects on lobster health. We compared the health of lobsters monthly for 1 yr using 2 nutritional indices (hepatopancreas dry weight and blood serum protein), and by the presence of external injuries and shell disease. Lobster blood serum protein and dry weight index varied throughout the year, peaking in late summer to early fall, dropping sharply during the winter, and rising again through the spring, likely in response to seasonal changes in environmental factors, such as water temperature. Both legal and sublegal lobsters within actively fished traps showed lower nutritional condition than lobsters from the surrounding population throughout the fishing season, suggesting that few lobsters escape traps.

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Section: Lobster Health Metricsmentioning

confidence: 99%

Section: Lobster Health Metricsmentioning

confidence: 99%

Section: Lobster Health Metricsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal and fishery impacts on the nutritional condition of the Caribbean spiny lobster Panulirus argus in Florida, USA

Butler

Ross

et al. 2022

Mar. Ecol. Prog. Ser.

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“…Because there is no single best nutritional condition index for use in all situations (Gutzler and Butler, 2017;Hempson et al, 2018), we used three different indices to assess nutritional condition of lobsters: the weight/length (W/CL) ratio, the hepatosomatic index (HSI = HW/W × 100), and the blood (hemolymph) refraction index (BRI) (Lozano-Álvarez et al, 2017). In spiny lobsters, nutritional condition is positively related with both the W/CL ratio and the HSI, but for comparative purposes these indices need to be estimated on lobsters over a similar size range (Briones-Fourzán et al, 2009).…”

Section: Indices Of Nutritional Conditionmentioning

confidence: 99%

Coral Reef Degradation Differentially Alters Feeding Ecology of Co-occurring Congeneric Spiny Lobsters

et al. 2019

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Caribbean coral reefs are undergoing massive degradation, with local increases of macroalgae and reduction of architectural complexity associated with loss of reefbuilding corals. We explored whether reef degradation affects the feeding ecology of two co-occurring spiny lobsters: Panulirus guttatus, which is an obligate reef-dweller, and Panulirus argus, which uses various benthic habitats including coral reefs. We collected lobsters of both species from the back-reef zones of two large reefs similar in length (∼1.5 km) but differing widely in level of degradation, at the Puerto Morelos Reef National Park (Mexico). We measured the carapace length (CL) and weight (W) of lobsters, estimated three condition indices (hepatosomatic index, HI; blood refractive index, BRI; and W/CL ratio), and analyzed their stomach contents and stable isotope values (δ 15 N and δ 13 C). All lobsters tested negative for the presence of the virus PaV1, which can affect nutritional condition. Stomach contents yielded 72 animal taxa, mainly mollusks and crustaceans, with an average of 35 taxa per species per reef, but with much overlap. In P. guttatus, CL, HI, BRI, and W/CL did not vary with reef, but mean isotopic values did. The isotopic niche of P. guttatus showed little overlap between reefs, reflecting differences in local carbon sources and underlining the habitat specialization of P. guttatus, which exhibited a higher trophic position on the more degraded reef. Overall, the trophic position of P. guttatus was higher than that of P. argus. In P. argus, none of the variables differed between reefs and the isotopic niche was wide and with great overlap between reefs, reflecting the broader foraging ranges of P. argus compared to P. guttatus. Additional isotopic values from 16 P. argus caught at a depth of 25 m in the fore reef suggest that these larger lobsters forage over different habitats and have a higher trophic position than their smaller conspecifics and congeners from the back reef. The feeding ecology of P. argus appears to be less influenced by coral reef degradation than that of P. guttatus, but our results suggest a buffering effect of omnivory against habitat degradation for both lobster species.

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Bait-subsidized diets and their effects on ovigerous North American lobsters (Homarus americanus)

Goldstein

Shields

2018

Aquacult Int

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Comparison of Methods for Determining Nutritional Condition in Spiny Lobsters

Cited by 11 publications

References 30 publications

Seasonal and fishery impacts on the nutritional condition of the Caribbean spiny lobster Panulirus argus in Florida, USA

Seasonal and fishery impacts on the nutritional condition of the Caribbean spiny lobster Panulirus argus in Florida, USA

Coral Reef Degradation Differentially Alters Feeding Ecology of Co-occurring Congeneric Spiny Lobsters

Bait-subsidized diets and their effects on ovigerous North American lobsters (Homarus americanus)

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