Cannibalistic behavior in red king crabs reared under artificial conditions

Borisov, R. R.; Epelbaum, A.; Kryakhova, N. V.; Tertitskaya, A. G.; Kovatcheva, N. P.

doi:10.1134/s1063074007040049

Cited by 31 publications

(14 citation statements)

References 2 publications

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“…In most cases, t 50 will be a parameter of interest; however, there are times when the rapidity of the transition between stages may be relevant to the question posed by an investigator. For example, many crab species are cannibalistic, especially immediately after molting, when soft crabs are particularly vulnerable (e.g., Borisov et al, 2007). Therefore, to minimize cannibalism, a hatchery may find it valuable to determine under what conditions molting is highly synchronous among individuals within a tank (because all the individuals transition within a short space of time).…”

Section: Red King Crabmentioning

confidence: 99%

A new quantitative model of multiple transitions between discrete stages, applied to the development of crustacean larvae

Long¹

2016

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Abstract-Many biological processes are described in terms of transitions between discrete stages. For example, crustacean larvae generally pass through a number of stages that are punctuated by transitional molting events. On the other hand, some continuous processes, such as embryo development, are frequently described in terms of discrete stages. Despite the widespread use of such conceptual models, a mathematical model that quantitatively describes the transitions between multiple stages has not been developed for crustacean larvae. I describe a model of multiple transitions between stages that can be fitted to such data and that holistically describes the processes and allows explicit, quantitative comparisons among treatments or studies. The base of the model is the logistic equation that is frequently used to model a transition between 2 stages. By summing together multiple logistic equations, one for each transition between stages, the model can accommodate multiple stages. Variance is modeled by treating each transition as a binomial distribution and summing the variance from each transition. To demonstrate, I fitted the model to data on larval development of red and blue king crabs (Paralithodes camtschaticus and P. platypus). The model provides an excellent fit for these data and quantitatively describes the process of larval development for these crab species.

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Section: Red King Crabmentioning

confidence: 99%

A new quantitative model of multiple transitions between discrete stages, applied to the development of crustacean larvae

Long¹

2016

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“…; Borisov et al . ). The objective of this study was to test the effects of dietary astaxanthin supplementation on survival, growth and shell colouration of juvenile red king crab under typical indoor hatchery grow‐out conditions.…”

Section: Introductionmentioning

confidence: 97%

Dietary astaxanthin supplementation for hatchery-cultured red king crab,Paralithodes camtschaticus, juveniles

2012

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We conducted large-scale production trials in Seward, Alaska, USA to investigate effects of dietary astaxanthin supplementation on survival, growth and shell colouration of recently settled juvenile (C1-C4) red king crabs (Paralithodes camtschaticus). We supplemented a control diet of commercial crustacean feeds with astaxanthin, and fed these diets to juvenile king crabs at densities of 2000 and 4000 crabs m À2 for 56 days. We assessed survival and growth by counting crabs and individually measuring carapace width and weighing crabs at the start and end of the experiment, and quantified crab colour (hue, saturation, brightness) in digital photographs. Diets containing astaxanthin had higher survival, suggesting that astaxanthin may provide nutritional or immune system benefits. Crabs had lower hue, higher saturation and lower brightness values when fed diets containing astaxanthin, suggesting that red king crab colouration is plastic and responds to diet. Astaxanthin is likely an important dietary component for hatchery or laboratory reared red king crab juveniles, and should be considered for aquaculture and other rearing of this and possibly other crustacean species.

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“…The incongruity in the survival and growth may be attributed to the foraging behavior of conspecifics. Larger crabs may feed on smaller crabs leading to disproportionate sizes of individuals in a culture medium (Broderson et al 1989;Borisov et al 2007). Asynchronous molting may have originally contributed to the size variability.…”

Section: Different Stocking Densitiesmentioning

confidence: 99%

Growth, Development, and Survival of Portunus pelagicus Larvae and Juveniles in Different Feed Regimens, Rearing Media, and Stocking Densities

Cabacaba¹,

Badocdoc²,

Boiser³

et al. 2020

TPJF

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Various factors in P. pelagicus seed production and grow-out culture were investigated in this study. Experiments were conducted to 1) compare natural and artificial feeds for larval production, 2) evaluate indoor tank and outdoor net cages as rearing media, and 3) assess different stocking densities for grow-out culture. Growth, development, and survival were assessed for the performance of each variable. (I) In larval production, the development of megalopa larvae into crab instar was synchronous in both natural and artificial feed treatments in a 5-day rearing observation. Crab instars began to appear on Day 4 with 27% composition in both feeds. Although survival appeared to be relatively higher in natural feed (43.96 ± 6.04%), this was not significant from survival in artificial feed treatment (33.33 ± 13.34), (t = 0.726, p > 0.05). (II) In Phase I growout culture, a two-variable design experiment was conducted to assess growth performance and survival of crab juveniles reared in indoor tanks and outdoor net cages at different stocking densities. Specific growth rate (SGR) differed significantly (t = 2.937, p < 0.05) between indoor tanks (6.39 ± 0.24%.d-1) and outdoor net cages (8.31 ± 1.11%.d-1). However, mean survival rate was better in indoor tanks (20.83 ± 9.24%) than outdoor net cages (8.94 ± 3.58% only), (t = 2.938, p = 0.015). In terms of stocking density, SGR was highest in 75 ind.m-2 (7.87 ± 2.44%.d-1). However, growth performance and survival of juveniles among different stocking densities were not significantly different (p > 0.05). Furthermore, two-factor ANOVA results have shown that growth performance of the juveniles was influenced by both the differences in rearing medium and stocking density, but not in terms of survival (F = 0.120, p = 0.888). (III) In Phase II grow-out culture, juveniles attained highest SGR (3.54 ± 0.56%.d-1) at 5 ind.m-2 stocking density. This was followed by 15 ind.m-2 (3.45 ± 2.39%.d-1) and by 10 ind.m-2 (2.33 ± 0.50%.d-1) (p > 0.05). However, survival rate was highest in 15 ind.m-2 (46.67 ± 0.00%), but the differences among other stocking densities were not statistically significant (p > 0.05). Overall, results suggest that artificial feed can be an alternative for Artemia in rearing megalopae to crab instar stage. Stocking density in Phase I and II grow-out culture did not substantially affect growth performance and survival of juvenile P. pelagicus. However, higher stocking density increases incidence of cannibalism among reared crabs.

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Cannibalistic behavior in red king crabs reared under artificial conditions

Cited by 31 publications

References 2 publications

A new quantitative model of multiple transitions between discrete stages, applied to the development of crustacean larvae

A new quantitative model of multiple transitions between discrete stages, applied to the development of crustacean larvae

Dietary astaxanthin supplementation for hatchery-cultured red king crab,Paralithodes camtschaticus, juveniles

Growth, Development, and Survival of Portunus pelagicus Larvae and Juveniles in Different Feed Regimens, Rearing Media, and Stocking Densities

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