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Florida Fishery-Wide Reproductive In...

Crowley, Claire Elizabeth.

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Florida Fishery-Wide Reproductive Indices of Stone Crab, Menippe mercenaria, and Their Application to Stock Assessment and Management.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Florida Fishery-Wide Reproductive Indices of Stone Crab, Menippe mercenaria, and Their Application to Stock Assessment and Management./
作者:	Crowley, Claire Elizabeth.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	147 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-12(E), Section: B.
Contained By:	Dissertation Abstracts International78-12B(E).
標題:	Biological oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10209346
ISBN:	9780355133547

Florida Fishery-Wide Reproductive Indices of Stone Crab, Menippe mercenaria, and Their Application to Stock Assessment and Management.
Crowley, Claire Elizabeth.

Florida Fishery-Wide Reproductive Indices of Stone Crab, Menippe mercenaria, and Their Application to Stock Assessment and Management. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 147 p.

Source: Dissertation Abstracts International, Volume: 78-12(E), Section: B.

Thesis (Ph.D.)--University of South Florida, 2017.

This item is not available from ProQuest Dissertations & Theses.

The stone crab, Menippe mercenaria, supported the third most valuable fishery in Florida in 2016. Declining catch per unit effort (CPUE) and overall negative trend in landings since 2000 have raised concerns among fisherman, researchers, and fishery managers about the resiliency of the fishery. The Florida Fish and Wildlife Research Institute estimated that the Florida stone crab fishery has been overexploited since 1997. Overexploited fisheries, such as the commercial stone crab fishery, risk induced changes in life history parameters, such as age at maturation and reproductive output. In turn, these population-level changes have the potential to reduce the spawning stock biomass and future recruitment to the fishery. The research presented in this dissertation was intended to assess the Florida stone crab fishery stock for: 1) size at sexual maturation in females, 2) size at maturation in males, 3) potential fecundity, modeled as a function of spatial and temporal variables, 4) spawning potential ratios, an index that reveals potential recruitment overfishing, by formulating a per recruit model using the reproductive indices developed in this research, and 5) evaluating the impact of management changes on the spawning stock biomass.

ISBN: 9780355133547Subjects--Topical Terms:

2122748
Biological oceanography.

Florida Fishery-Wide Reproductive Indices of Stone Crab, Menippe mercenaria, and Their Application to Stock Assessment and Management.
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500 $a Source: Dissertation Abstracts International, Volume: 78-12(E), Section: B.
500 $a Adviser: Kendra L. Daly.
502 $a Thesis (Ph.D.)--University of South Florida, 2017.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a The stone crab, Menippe mercenaria, supported the third most valuable fishery in Florida in 2016. Declining catch per unit effort (CPUE) and overall negative trend in landings since 2000 have raised concerns among fisherman, researchers, and fishery managers about the resiliency of the fishery. The Florida Fish and Wildlife Research Institute estimated that the Florida stone crab fishery has been overexploited since 1997. Overexploited fisheries, such as the commercial stone crab fishery, risk induced changes in life history parameters, such as age at maturation and reproductive output. In turn, these population-level changes have the potential to reduce the spawning stock biomass and future recruitment to the fishery. The research presented in this dissertation was intended to assess the Florida stone crab fishery stock for: 1) size at sexual maturation in females, 2) size at maturation in males, 3) potential fecundity, modeled as a function of spatial and temporal variables, 4) spawning potential ratios, an index that reveals potential recruitment overfishing, by formulating a per recruit model using the reproductive indices developed in this research, and 5) evaluating the impact of management changes on the spawning stock biomass.
520 $a The physiological, behavioral, morphological, and functional maturity of female stone crabs were assessed in individuals collected throughout the fished range of the population on the west Florida shelf (Cedar Key -- Sawyer Key). Histology was used to determine oocyte maturity, presence of spermatophores, and presence of postovulatory follicles. Decision-tree analysis suggested that 50% of female stone crabs were mature at 43 mm carapace width, when using a combined variable of physiological and behavioral maturity. The decision tree accurately classified 98% of mature females and 85% of immature females. Morphological maturity was assessed using piecewise regression to determine where allometric changes in growth occurred between carapace width and crusher claw length. The transition point between mature and immature females occurred at a carapace width of 66.3 mm. Differences in estimates of size at sexual maturity between morphological and physiological, behavioral, and functional maturity indicate that relative growth of body parts is not a reliable estimate of sexual maturity in stone crabs. Histological analysis revealed that smaller females are contributing to the spawning population more than previously estimated.
520 $a Multiple factors influencing variability in stone crab batch fecundity were quantified across Florida fishery sites, by implementing a negative binomial model. Fecundity was strongly and positively related to carapace width, and parameter estimates indicated that batch fecundity was on average higher at Pavilion Key (southwest Florida) and Tampa Bay (central Florida), relative to Sawyer Key (south Florida) and Cedar Key (northwest Florida) sites at the northern and southern ends of the study area. Fecundity varied among 2013-2016 and was highly variable among months. In general, the lowest batch fecundity occurred in winter and spring months, while peak batch fecundity occurred in July and August, highlighting the common seasonal trend in crustacean reproductive cycles.
520 $a Spawning potential ratios were used to evaluate the impact of alternative biological and management scenarios to the reproductive output in a theoretical stone crab population. The model incorporated the findings of size at maturation and fecundity established in previous chapters, as well as contemporary temperature-dependent declaw mortalities. Spawning potential ratios increased with decreasing size at sexual maturity and were sensitive to past and present estimates of size at sexual maturity, and increasing natural mortality. However, the largest contributor to changes in the fished stock appears to be mortality associated with declawing and releasing stone crabs. We assessed various management scenarios including declaw lengths, vulnerability to capture, and variable season timing and length. Increases in declaw length and size at vulnerability to capture provided moderate protection to the spawning stock. The model estimated that adaptive management regulations which considered the timing and duration of seasonal fishing, based on mean monthly temperatures below 24°C (temperature at which declaw mortality increases), had the potential to greatly reduce mortality, and provided protection to the spawning population. The model was able to examine a wide range of biological and management scenarios; however, more research should be conducted to determine the socioeconomic impact of regulation changes. The Florida stone crab fishery is an amalgamation of unique fishing practices, rich culture, and both regional and economic influence. Evolving fishing practices, conservation initiatives, and environmental conditions have the potential to transform the fishery. Therefore, fisheries managers, scientists, and stakeholders must work cooperatively to ensure the resiliency of the stone crab fishery. (Abstract shortened by ProQuest.).
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