Estimating rates of mortality in stocks of Metapenaeus macleayi in estuaries of eastern Australia

Montgomery, S.S.; Barchia, I.M.; Walsh, Chris T.

doi:10.1016/j.fishres.2011.09.003

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…Mortality estimates can also be derived using mark-recapture studies (e.g. [78, 83, 84]) or catch-curve or cohort progression analyses (e.g. [82, 83, 85]).…”

Section: Discussionmentioning

confidence: 99%

Estimating the value of tropical coastal wetland habitats to fisheries: Caveats and assumptions

2019

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Habitat valuation can provide an objective basis for the prioritisation of conservation and restoration actions. The attribution of fisheries production to particular habitat units is an important measure of value, but is difficult to estimate. Using the case study of habitat use by juvenile banana prawns in a tropical estuary, we assessed the potential to produce valid value estimates at two spatio-conceptual scales: estuary reach and whole estuary. Additionally, we also explore the potential to produce meaningful value estimates at the scale of whole estuary contribution to the offshore fisheries stock. A diversity of potential and actual sources of error and logical problems means that quantification at any scale is at best of uncertain validity and produces estimates that are likely to produce unreliable results if treated as quantitative inputs to production models. Estimates for the whole estuary were the most viable, although still requiring substantial assumptions that may or may not be reasonable in particular situations. Estimates for individual habitats required the unreasonable assumption of limited prawn movement, while estimates of contribution of an estuary to the fishery required difficult-to-obtain and usually unavailable information. Because low occupancy habitats can have trophic value, we also used stable isotope analysis to assess the importance of mangroves and saltmarshes to prawn nutrition. No particular habitat was of critical trophic importance, again suggesting that the habitat-production link is most usefully assessed at the whole-of-estuary scale. While valuable and required to support targeted ecosystem management and protection and restoration efforts, valid estimates of the contribution of particular units to fisheries are likely to be unachievable in many situations.

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“…Mortality estimates can also be derived using mark-recapture studies (e.g. [78, 83, 84]) or catch-curve or cohort progression analyses (e.g. [82, 83, 85]).…”

Section: Discussionmentioning

confidence: 99%

Estimating the value of tropical coastal wetland habitats to fisheries: Caveats and assumptions

2019

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“…It is one of the key species that inhabits estuarine environments from Tin Can Bay, Queensland, to Corner Inlet, Victoria (Ruello 1973b, Glaister 1978a. Estuarine prawn trawling is restricted to 3 regions in New South Wales (NSW): the Clarence, the Hunter, and the Hawkesbury Rivers (Broadhurst & Kennelly 1994, Montgomery et al 2012. Of the numerous other aquatic species caught in the Hawkesbury River, M. macleayi has been the most popular type of seafood among Sydney fish consumers, and their catch area falls mostly within the lower estuarine reaches of the Hawkesbury-Nepean River (HNR) system (Hawkesbury Trawl Association 2001, Howard & Howard 2005.…”

Section: Introductionmentioning

confidence: 99%

“…Commercial fishers in the region are concerned that future urbanization will result in changes to the natural pattern of river flow, presence of excessive algae growth in upstream reaches, and increased discharge of treated effluent, and will have negative consequences on their fish catch (Hawkesbury Trawl Association 2001). Although the effects of rainfall (Ruello 1973b), ecological interactions with the sediment bed (Ruello 1973a), migration habits (Ruello 1977), effects of river discharge (Glaister 1978b), and mortality patterns (Montgomery et al 2012) of school prawns have been well studied in some detail, there has been less attention given to understanding the influence of water quality on prawn harvest.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Water Quality on the Harvest of School Prawn (Metapenaeus macleayi) in a Peri-Urban River System

Pinto

Maheshwari

2012

Journal of Shellfish Research

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The school prawn (Metapenaeus macleayi) is important among commercial prawn trawler operators, but its harvest is affected in a complex way by a number of interacting water quality, and other variables. In this study, using the Hawkesbury-Nepean River system as a case study, we use Pearson correlation and hierarchical agglomerative cluster analysis (HACA) to assess the influence of the selected water quality (n ¼ 7), quantity (n ¼ 1), and weather (n ¼ 2) parameters on the prawn harvest. Using data records (n ¼ 104) collected over a 9-y period, we found water temperature (r ¼ 0.63, P < 0.01), dissolved oxygen (r ¼ -0.59, P < 0.01), and rainfall (r ¼ 0.26, P < 0.01) to be significantly correlated variables with prawn harvest. The HACA produced 3 distinct clusters of variables nutrient availability for prawns (the total nitrogen, the total phosphorus, reactive silicate, turbidity, and suspended solids), the physical river environment (temperature, rainfall, and river flow), and the biochemical river environment (dissolved oxygen and chlorophyll a). The study revealed that 2 key variables, viz., temperature and rainfall, representing the physical river environment are statistically significant in affecting prawn harvest in the study area. Therefore, from fishing industry point of view, the future river management need to focus on strategies that will improve the physical river environment, particularly to cope with the impacts of future peri-urban development and climate change scenarios.

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A bio-economic management strategy evaluation for a multi-species, multi-fleet fishery facing a world of uncertainty

Scandol

Greenville

2013

Ecological Modelling

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Estimating rates of mortality in stocks of Metapenaeus macleayi in estuaries of eastern Australia

Cited by 5 publications

References 36 publications

Estimating the value of tropical coastal wetland habitats to fisheries: Caveats and assumptions

Estimating the value of tropical coastal wetland habitats to fisheries: Caveats and assumptions

Impacts of Water Quality on the Harvest of School Prawn (Metapenaeus macleayi) in a Peri-Urban River System

A bio-economic management strategy evaluation for a multi-species, multi-fleet fishery facing a world of uncertainty

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