59 research outputs found
Improving confidence in the management of the blue swimmer crab (Portunus armatus) in Shark Bay PART III: Proceedings of the Third National Workshop on Blue Swimmer Crab Portunus armatus Western Australian Fisheries and Marine Research Laboratories, Hillarys, Perth, 3 – 4 June 2015. FRDC Project No. 2012/15
No full textThe ‘Third National Workshop on Blue Swimmer Crab’ was organised and held at Department of Fisheries (Western Australia) in Hillarys (3-4 June, 2015), almost 15 years after the second workshop in 1997. The workshop brought together fisheries scientists, managers, university researchers, consultants, industry stakeholders and fishers from across Queensland, New South Wales, South Australia, Tasmania and Western Australia and addressed six broad themed sessions;
• State overview of blue swimmer crab commercial fisheries
• Monitoring, stock assessment and harvest strategy
• Environmental drivers and climate change
• Blue swimmer crabs….from the sea to the plate
• Recreational fishing and surveys
• Management, policy and industry perspective
Improving marketability through translocation: a lobster case study from southern Australia
No full textAbstract
Chandrapavan, A., Gardner, C., Green, B. S., Linnane, A., and Hobday, D. 2011. Improving marketability through translocation: a lobster case study from southern Australia. – ICES Journal of Marine Science, 68: 1842–1851. Translocation as a method to increase the value of less-marketable, deep-water southern rock lobster Jasus edwardsii was explored. First, variation in the commercially important shell colouration and body shape between deep- and shallow-water Tasmanian populations and among South Australian and Victorian populations was quantified. Deep-water J. edwardsii were pale in colour, with longer walking legs but less meat content than shallow-water, red-coloured J. edwardsii. Traits in body shape were variable among deep-water populations across the three states and between sexes in each population. Deep-water lobsters were then translocated to a shallow-water inshore reef to determine whether the observed variation in traits was plastic and whether translocation could be used to improve the quality of deep-water lobsters. Translocated lobsters were then monitored over a 14-month post-release period, and during this time, they changed from a pale/white colour to the more marketable red colour within a single moult. Plasticity was observed in tail morphology, but not in leg morphology. The translocation experiment was successful in transforming pale/white deep-water lobsters into red lobsters with higher market value in a phenotypic response to habitat manipulation. Translocation appears to have commercial application for exploiting natural plasticity in the market traits of lobsters to increase price.</jats:p
Resource Assessment Report No. 1: Mid-West Scallop Resource 2024 Assessment
No full textThe Mid-West Scallop Resource (Resource) is only accessed by the Abrolhos Islands Mid-West Trawl Managed Fishery (AIMWTMF). The AIMWTMF is the second largest scallop fishery in Western Australia. Access is limited to the 10 licences granted to access the Resource, which are managed through a range of, gear controls, catch rates and seasonal closures. They access saucer scallops, Ylistrum balloti (formerly Amusium balloti) using otter trawls fished over predominantly sand. The fishery was certified by the Marine Stewardship Council in 2021, with the fishery entering re-certification in 2026.
In 2024, 95.7 t meat weight (478.5 t whole weight) of saucer scallops was retained, with no retention of other species reported. This highly targeted nature of the fishery is consistent with historical fishing practices, with minimal other species retained. The Resource was valued at ~ $4.3 million and was accessed by four commercial vessels in 2024.
Saucer Scallops
There was a notable decline in fishery-independent indices in 2024, with both approaching their respective limit reference point. Volatility in stock abundance is not uncommon or unexpected for such a fecund, short-lived species. This is particularly the case for scallops which are susceptible to shifts in environmental conditions. The stock of saucer scallops in the Mid-West coast is classified as Sustainable-Adequate, as the index is above the limit reference point. However, based on the risk-matrix (C4 × L3) the risk to this stock is assessed as Severe.
Ecological Components
An updated ecological assessment of the Resource indicated that all components (retained catch, bycatch, ETPs, habitat and ecosystem effects) were low or negligible risk. The basis for most assignment of risk was from an Ecological Risk Assessment conducted in 2019 (Stoklosa 2019 in DPIRD 2020b), augmented with updated data
Understanding recruitment variation (including the collapse) of Ballot’s saucer scallop stocks in Western Australia and assessing the feasibility of assisted recovery measures for improved management in a changing environment. FRDC Project No. 2015/026
No full textThis study examined possible contributing environmental factors to the recruitment variability of the Ballot’s saucer scallop Ylistrum balloti across the main stocks in Western Australia. The project was undertaken to explain the variation observed between years and between regions as well elucidating the potential cause of a major decline in scallop stocks following an extreme marine heatwave, with these findings intended to improve future management advice
Haemolymph condition of deep-water southern rock lobsters (<i>Jasus edwardsii</i>) translocated to inshore reefs
No full textMate choise in homarid lobsters, will they recognise their own species?
No full textAs European and American lobsters are so similar that it is difficult to spot the difference, and as they have so many similarities in behaviour and life history, this study was initiated to test if they could make distinctions between the species when coexcisting. Female European lobsters, close to moulting/spawning, were released in a tank with one European and one American male in a tank with two shelters available. The American and European males were dominant in half of the trials. Registrations were made of which lobsters where fighting,
visiting another lobster, cohabitating and mating. Dominance had no importance. The European lobsters chose to interact more and for longer duration of time with each other. Mating, mating attempts and peaceful cohabitation occurred only between these lobsters. The American lobsters showed less social activity. It seems like it is a
barrier between the species, where species-specific chemical communication probably is of importance. NORSK SAMMENDRAG: Siden europeisk og amerikansk hummer er så like at det er vanskelig å se forskjell, og de samtidig har tilsynelatende lik atferd og livshistorie, så ble det undersøkt hvorvidt hummeren selv kunne skille på art.
Hunnhummer som ble vurdert til å være nær skallskifte/gyting ble introdusert til en europeisk og en amerikansk hann i et felleskar med to skjul. Den dominerende hannen var like ofte en amerikaner som en europeer, for å se om art eller dominans var viktig. Det ble registrert hvilke hummere som slåss, besøkte hverandre, delte skjul og
parret seg. Dominans viste seg å være uten betydning. De europeiske hummerne fant fram til hverandre og brukte mest tid uansett aktivitet på hverandre. Parring og parringsforsøk forekom kun mellom europeisk hummer, i likhet med fredelig deling av skjul. Amerikansk hummer var gjennomgående mindre sosialt aktiv. Det ser ut til å
være en barriere mellom artene, der artsforskjeller i kjemisk kommunikasjon trolig er til stede
Makevalg hos homarid hummer; kan de gjenkjenne sin egen art?
No full textAs European and American lobsters are so similar that it is difficult to spot the difference, and as they have so many similarities in behaviour and life history, this study was initiated to test if they could make distinctions between the species when coexcisting. Female European lobsters, close to moulting/spawning, were released in a tank with one European and one American male in a tank with two shelters available. The American and European males were dominant in half of the trials. Registrations were made of which lobsters where fighting,
visiting another lobster, cohabitating and mating. Dominance had no importance. The European lobsters chose to interact more and for longer duration of time with each other. Mating, mating attempts and peaceful cohabitation occurred only between these lobsters. The American lobsters showed less social activity. It seems like it is a
barrier between the species, where species-specific chemical communication probably is of importance. NORSK SAMMENDRAG: Siden europeisk og amerikansk hummer er så like at det er vanskelig å se forskjell, og de samtidig har tilsynelatende lik atferd og livshistorie, så ble det undersøkt hvorvidt hummeren selv kunne skille på art.
Hunnhummer som ble vurdert til å være nær skallskifte/gyting ble introdusert til en europeisk og en amerikansk hann i et felleskar med to skjul. Den dominerende hannen var like ofte en amerikaner som en europeer, for å se om art eller dominans var viktig. Det ble registrert hvilke hummere som slåss, besøkte hverandre, delte skjul og
parret seg. Dominans viste seg å være uten betydning. De europeiske hummerne fant fram til hverandre og brukte mest tid uansett aktivitet på hverandre. Parring og parringsforsøk forekom kun mellom europeisk hummer, i likhet med fredelig deling av skjul. Amerikansk hummer var gjennomgående mindre sosialt aktiv. Det ser ut til å
være en barriere mellom artene, der artsforskjeller i kjemisk kommunikasjon trolig er til stede
Colour variation in the southern rock lobster<i>Jasus edwardsii</i>and its economic impact on the commercial industry
No full textStock Assessment for the Shark Bay Scallop Fishery
No full textThe Shark Bay scallop fishery is based on a single species Amusium balloti and is the most valuable scallop fishery (AUD 10-57 million) in Western Australia. This species is short-lived, has fast growth and highly variable recruitment which is primarily environmentally driven. The scallop fishery consists of two classes of licences, A and B. There are fourteen Licensed Fishing Boats with A Class licences that target scallops and account for approximately 70% of the catch. There are twenty-seven Class B licences, which primarily fish for prawns (in the Shark Bay Prawn Managed Fishery) with scallops a secondary target species. Restructuring and gear amalgamation within the Class B fleet has currently reduced the number of boats actively fishing to 1
Projeto gráfico de história em quadrinhos com referências em elementos culturais
No full textEste trabalho tem como objetivo o desenvolvimento de uma história em quadrinhos de autoria própria cujo conceito seguirá inspirações de elementos culturais do estado do Rio Grande do Sul e do Brasil. O projeto contempla o desenvolvimento gráfico conceitual de uma publicação impressa, e analisa e desenvolve os passos para a criação de uma história em quadrinhos. O trabalho apresenta uma explanação sobre os quadrinhos e sua história, analisa e detalha os elementos dos quadrinhos e mostra o processo de criação do projeto A Jornada de Arani, seguindo a metodologia do autor. Considerou-se as diferentes formas de expressão dos quadrinhos, assim como o potencial como objeto de entretenimento e comunicação que este tipo de material pode proporcionar.This project is concerning the development of a Comic Novel by own making, where-with its concept will be created following inspirations on elements of local culture of the state of Rio Grande do Sul and Brazilian culture. The assignment includes the conceptual graphic development of a printed publication and analyzes the steps to create a comic book. The paper presents an explanation of comics and its history. Also details and reviews the comics elements leading to the process of creation of the story The Journey of Arani, following the author's methodology. Regarding the creation of this project, the author considers the different ways of ex-pression of comics, as well the potential of entertainment and communication that a publi-cation like this can provide
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