Fecundity of the New Zealand red rock lobster,<i>Jasus edwardsii</i>

Annala, John H.; Bycroft, Bruce L.

doi:10.1080/00288330.1987.9516263

Cited by 37 publications

(23 citation statements)

References 7 publications

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“…Because fecundity of similar-sized females varies little geographically (Annala & Bycroft 1987), larval production is principally determined by the biomass of mature females. Estimates of the biomass of mature females for various quota management areas and sub stocks are available from stock assessment models (P. Breen, NIWA, pers.…”

Section: Methodsmentioning

confidence: 99%

Sources and sinks of larval settlement in Jasus edwardsii around New Zealand: Where do larvae come from and where do they go?

Chiswell¹,

Booth²

2008

Mar. Ecol. Prog. Ser.

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Isolated adult populations tend to be interconnected via the larval stage. New Zealand red rock lobster Jasus edwardsii larvae metamorphose 12 to 24 mo after hatching. Because of this long larval life, J. edwardsii provides a useful species for studying population connectivity using satellite-derived ocean currents. In this study, tracks of J. edwardsii larvae originating from different populations are simulated to build a statistical picture of larval dispersal. By adding an algorithm for larval metamorphosis, and tuning the algorithm parameters to fit observed post-metamorphosis settlement patterns, we estimate where settlement in each population originated (i.e. larval sources), and also where larvae from each population settle (i.e. larval sinks). There are likely to be 4 major geographical areas for larval dispersal around New Zealand. In the far north, both sources and sinks are non-local. Along the east coast of the North Island, because of entrainment by the Wairarapa Eddy, sources are both local and distant, whereas most sinks are local. In contrast, to the south of the South Island, most sources are local, whereas sinks are both local and distant. The Chatham Islands form a separate geographical area, with primarily non-local sources and local sinks. The results are robust to differences in the physical model, but sensitive to metamorphosis algorithm parameters. This indicates that understanding larval behaviour is the most critical aspect in determining larval connectivity.KEY WORDS: Jasus edwardsii · Lobster · Larval dispersal · Numerical modelling · New Zealand · Phyllosoma · Settlement 354: 201-217, 2008 and perhaps of any benthic organism (Bradbury & Snelgrove 2001). Rock lobster larvae are known as phyllosomas (from the Greek phullon, meaning 'leaf,' and soma, meaning 'body') due to their transparent leaf-like morphology. Phyllosomas metamorphose into post-larval pueruli, which then swim shoreward to settle in the coastal zone. Pueruli have poorly developed mouth parts (Nishida et al. 1990) and apparently rely almost entirely on stored energy for their migration shoreward, implying a limit to the distance they can migrate. Resale or republication not permitted without written consent of the publisherMar Ecol Prog SerBecause of the long larval life and limited swimming range of the pueruli, there must be some mechanism that keeps phyllosomas close enough to the coast (or brings them back) to allow them to metamorphose and then recruit successfully. Off the east coast of the North Island, phyllosomas get entrained in the Wairarapa Eddy, a semi-permanent anticyclonic eddy (Roemmich & Sutton 1998); this leads to the high levels of puerulus settlement observed south of East Cape (Booth 1994, 2002, Chiswell & Roemmich 1998. In contrast, there has been no definitive explanation of any entrainment mechanism that leads to the high settlement seen in the southwest of the South Island (part of CRA 8). It has been suggested that phyllosomas can be carried across the Tasman Sea within their lifet...

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Section: Methodsmentioning

confidence: 99%

Sources and sinks of larval settlement in Jasus edwardsii around New Zealand: Where do larvae come from and where do they go?

Chiswell¹,

Booth²

2008

Mar. Ecol. Prog. Ser.

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“…Annala & Bycroft (1987) reported up to 20% of eggs might be lost to mid-incubation in wild New Zealand J. edwardsii whereas MacDiarmid & Kittaka (2000) reported significant and sometimes total loss of eggs in captivity. Perkins (1971) suggested that the amount of loss may be related to incubation duration and reported 36% egg loss in H. americanus during 9 months of incubation.…”

Section: Discussionmentioning

confidence: 99%

Effect of physical disturbance on reproductive performance in the spiny lobster,Jasus edwardsii

Smith¹,

Ritar²

2005

New Zealand Journal of Marine and Freshwater Research

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A study was conducted to examine the effects of physical disturbance on Jasus edwardsii spiny lobster broodstock during ovarian recrudescence through to larval hatch. Undisturbed broodstock were held in relative isolation and subjected to minimal human disturbance, which contrasted with weekly air exposure and handling of the disturbed animals. Broodstock behavioural response, phyllosoma number, competency, and survival in culture were examined. A higher proportion of broodstock from the undisturbed treatment were active during daylight hours compared with those in the disturbed treatment. All ovigerous females in the undisturbed group produced phyllosoma larvae compared with 72.7% of animals in the disturbed treatment. Individual undisturbed females produced greater numbers of phyllosoma larvae, which in turn performed better in larval competency tests, were larger at hatch, and survived better in culture than those from disturbed females. This study demonstrated that physical disturbance altered reproductive performance and larval competency of J. edwardsii. Protocols are suggested to minimise disturbance associated with handling in crustacean broodstock.

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“…However, any large discrepancy in viable fecundity must be assigned to egg loss/mortality. Up to 20% of eggs may be lost during incubation in wild J. edwardsii (Annala and Bycroft, 1987), while total egg loss may occur in captivity (MacDiarmid and Kittaka, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Egg loss in wild J. edwardsii is generally considered to be low in Australian waters (Morgan, 1972;Kennedy, 1993 unpublished Tasmanian fishery data) although there are reports of significant losses in many other crustacean species (Perkins, 1971;Annala and Bycroft, 1987;Waddy and Aiken, 1991;Tuck et al, 2000). From an aquaculture perspective, it is not known whether viable fecundity i.e., the number of newly-hatched phyllosoma produced by a female, is lower than egg production derived from fishery estimates particularly as captive animals are subject to additional husbandry stresses during the incubation period.…”

Section: Introductionmentioning

confidence: 99%

Sexual maturation in captive spiny lobsters,Jasus edwardsii, and the relationship of fecundity and larval quality with maternal size

Smith¹,

Ritar²

2007

Invertebrate Reproduction & Development

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SummaryReproductive and somatic parameters of southern rock lobsters, Jasus edwardsii, held captive since puerulus and wild-caught adults were examined in terms of size at onset of maturity (SOM) and fecundity, culminating in an examination of how adult size may relate to larval competency. The SOM was much smaller in captive animals (62.5 mm carapace length, CL) compared to historical fishery data and indicated that precocious maturation may be induced in captivity. During this study, the fecundity was assessed as the number of viable phyllosoma at hatch, which was ~ 45% of egg estimates from the historical fishery data, suggesting either declining egg numbers in wild stocks over time or that major egg loss occurs during embryonic development. The association between SOM and sexual dimorphism was examined for several morphometric parameters. In females, the SOM was concomitant with increases to the width of the 1 st and 2 nd abdominal segments above 62.5 mm CL, while 2 nd and 3 rd leg length increased disproportionately in males compared to females above 77.5 mm CL. There were significant correlations between viable fecundity and female size (r = 0.92), phyllosoma size (r = 0.74) and larval viability as quantified by stress indices (r = -0.56) and LD-50 (r = 0.56), indicating that larger females produce larger, more viable larvae. These physiological traits in larval, juvenile and adult animals may have an impact on fishery and aquaculture production.

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Fecundity of the New Zealand red rock lobster,Jasus edwardsii

Cited by 37 publications

References 7 publications

Sources and sinks of larval settlement in Jasus edwardsii around New Zealand: Where do larvae come from and where do they go?

Sources and sinks of larval settlement in Jasus edwardsii around New Zealand: Where do larvae come from and where do they go?

Effect of physical disturbance on reproductive performance in the spiny lobster,Jasus edwardsii

Sexual maturation in captive spiny lobsters,Jasus edwardsii, and the relationship of fecundity and larval quality with maternal size

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