Facultative secondary lecithotrophy in the megalopa of the shrimp Lysmata seticaudata (Risso, 1816) (Decapoda : Hippolytidae) under laboratory conditions

Certain decapod crustaceans can catabolize internal reserves to undergo partial or full larval development. This feature is termed secondary lecithotrophy, if energy used results from plankton derived organic matter accumulated Ig earlier larval stages. The present work reports the ability of Lysmata seticaudata megalopa to moll to the first juvenile stage in the absence of food. Unlike previous records of secondary lecithotrophy displayed by nonfeeding last larval stages of hermit crabs and spiny lobsters, the megalopa of L. seticaudata retains its feeding capacity. This is the first time such a feature has been reported in decapods, and the term facultative secondary lecithotrophy is proposed. The build up of energy reserves continues during the last zoeal stage of L. seticaudata, with starved zoea IX failing to molt to megalopa. Energy reserves that enable starved megalopa to molt to juvenile seem to be partially depleted, with starved juveniles produced either from, starved or fed megalopae being unable to molt to the next juvenile stage. The longer resistance of starved juveniles produced from fed megalopae (nine days), compared to that of starved juveniles produced from starved megalopae (five days), indicates that some energy reserves may pass to juvenile, not being totally depleted at metamorphosis.info:eu-repo/semantics/publishedVersio

The commercial aspects of spiny lobster farming

The Florida spiny lobster, Panulirus argus, is an important item in Florida fisheries, rating high among fishery products. The fishery is centered in south Florida and the Florida Keys but the commercial range may extend into other areas as more exploratory research is done. The majority of the catch is made using wooden traps and discarded ice cans, but large numbers are taken at certain times of the year in bully nets, shrimp trawls, and by hand. The catch is sold alive. The U. S. catches cannot satisfy the demand for this tasty product and each year millions of pounds are imported from South America, Africa, Australia, and other countries. Because of the fairly high market price placed on this animal and because of the large number imported, several persons have become interested in the artificial propagation of the spiny lobster and have requested information on the commercial feasibility of lobster farming. It is for that reason this paper is prepared. (4 page document

Proceedings of a workshop on Florida Spiny Lobster Research and Management, 24 August 1984

Agenda, abstracts, bibliography of recent literature on spiny lobsters, and list of participants. Workshop held at the Florida State University Marine Laboratory, 24 August 1984. (25pp. W.F. Hernkind (ed

On the occurrence of the puerulus larvae of the Indian spiny lobster, Panulirus homarus (Linn.), In Cochin backwater

The occurrence of puerulus larvae of the Indian spiny lobster, Panulirus homarus (Linn.) in tt» Cochin backwater is reported. Being the first record of these larvae frcmi Indian waters, brief notes on the puerulus, its metamorphosis to postpuerulus and the probable significance of their occurrence in the estuary are give

The Lobster and Shrimp Fisheries in Hawaii

A description of the lobster and deepwater shrimp fisheries in Hawaii, addressing harvest levels, biology, and research, is presented. Both fisheries are trap fisheries. The lobster fishery is a limited entry fishery with 1991 landings of 200 metric tons. The shrimp fishery is unregulated, with very sporadic effort, and annual landings below 200 metric tons

Identifying factors affecting the low western rock lobster puerulus settlement in recent years Final FRDC Report – Project 2009/18

Objectives 1. To use a larval advection model and the rock lobster population dynamics model to assess the effect of the spatial distribution of the breeding stock on the puerulus settlement 2. To assess environmental factors (water temperature, current, wind, productivity, eddies) and breeding stock affecting puerulus settlement 3. To examine climate change trends of key environmental parameters and their effect on the western rock lobster fisher

Out of the pot and into the money: Managing the Western Rock Lobster Fishery by ITE's or ITQ's?

The West Coast Rock Lobster fishery is Australia's most valuable commercial fishery. Around 550 vessels harvest an average of 10,500 tonnes of lobster per annum. The industry has an enviable track record of biological management based on a variety of input controls, although three significant pot reduction interventions have been necessary in recent years. An evaluation of a range of possible future management regimes is reported in this paper. The results were derived from a purpose built bio-economic model three separate biological zones in the fishery using non linear optimization to produce ten year steady state solutions for alternative management options. Management options included the current pot control system, and versions of variable transferable catch quota. Key outputs for each scenario include: net economic benefits, breeder biomass index, annual catch, annual pot lifts, number of pots and vessel numbers. The results indicate significant potential net economic gains from moving away from the current input control regime. The range of scenarios modelled illustrated some of the tradeoffs between maximising net economic returns and minimizing biological risks, as well as quantifying the impact of changes such as improved pot design and extended fishing seasons. The results will inform consideration by the industry about a possible new management system.rock lobster, quotas, ITQs, Western Australia, bioeconomic, economic benefits, Resource /Energy Economics and Policy,

Pilot phase trial to quantify the extent and relevance of any deepwater puerulus settlement that may have taken place in the Western Rocklobster Fishery

This study had two objectives. Firstly to trial modifications to commercial western rock lobster pots, so as to sample as wide a size range of lobsters on the grounds as possible. Sampling took place over a 10 day period between 13-24 September 2009, with seven commercial fishermen being responsible for collection of the data at different sampling locations (Mandurah, Fremantle, Lancelin, Dongara, Geraldton, Abrolhos and Kalbarri). This arrangement proved to be successful in that a wide area of the coast was covered by the sampling regime and good quality catch composition data was achieved across the four depth zones (0-10 fm, 10-20 fm, 20-30 fm and >30 fm) that were sampled. The different pot modifications that were trialled sampled a wide size range (25-144 mm CL), but mostly caught lobsters around the legal size limit (modal size, 80 mm CL). In three of the four areas where more than one pot type was used, there were significant differences (p<0.01) in the catch rates of one or more size classes between the various pot types.The second objective was to establish whether there has been a shift in post-puerulus settlement from shallow to deeper waters. Analysis showed that depth was highly significant (p<0.05) in determining the catch rates of most size classes (≤50 mm CL; 51-65 mm CL; 66-76 mm CL; 77-105 mm CL and ≥105 mm CL). Generally, small size classes were sampled in the shallow depth categories and larger lobsters were sampled in the deeper depth categories, which would suggest that as in the past, recent puerulus settlement has been in shallow depths. Accordingly, it would seem reasonable to conclude that it is unlikely that there has been a major shift in the depths at which pueruli are settling. However, small lobsters were sampled in low numbers in the deep water categories in this survey and this therefore does not exclude the possibility that deep water settlement may be becoming more common than in past.In terms of recommendations, more monitoring of post-puerulus/juvenile lobsters using modified commercial pots similar to those used in this study has the potential to provide inter-annual comparisons of the numbers of small size classes settling at different depths on the grounds. It is only with more data of this type over a longer time period, that it will be possible to show whether there is any indirect evidence of a shift in settlement to deeper water. Should this work continue into the future, it would be beneficial to standardize on a consistent type of modification to the commercial pots so that more reliable comparisons of the relative numbers of juvenile animals can be made between areas

Availability of puerulus from natural catch for lobster panulirus spp. nursery culture

Indonesia merupakan salah satu negara yang melakukan ekspor lobster ke negara Hongkong, Vietnam, China, dan Singapura, dengan nilai ekspor lobster Indonesia mengalami rata-rata pertumbuhan 3,54% pertahun. Produksi lobster tersebut masih mengandalkan hasil tangkapan, karena budidaya lobster belum banyak dilakukan di Indonesia. Pantai Barat Provinsi Lampung dikenal sebagai daerah tangkapan lobster yang dimanfaatkan oleh nelayan setempat sebagai sumber pendapatan utama. Untuk mengetahui potensi ekonomi dari budidaya lobster, maka dilakukan penelitian dengan tujuan menganalisis ketersediaan benih bening lobster (BBL) dan&nbsp; rantai pasok lobster sebagai suplai benih untuk kebutuhan budidaya lobster. Metode penelitian ini dilakukan dengan metode survei di Kecamatan Krui Selatan, Kabupaten Pesisir Barat, Lampung. Responden dalam penelitian adalah para nelayan penangkap BBL dan pengepul BBL. Penentuan responden dilakukan dengan metode snowball sampling. Hasil penelitian menunjukkan bahwa jenis lobster utama yang ditangkap adalah jenis lobster pasir dan lobster Mutiara.&nbsp; Hasil tangkapan nelayan lobster pada bulan gelap yaitu rata-rata 121 340 ekor BBL/bulan, sedangkan pada bulan terang rata-rata 4 680 ekor BBL/bulan, sehinnga dalam setahun benih yang dihasilkan mencapai 1.500.000 ekor BBL. BBL hasil tangkapan nelayan akan dijual pengepul kecil, selanjutnya ke pengepul besar, distributor dan eksportir. BBL terdistribusi ke berbagai wilayah mencakup Lampung, Bengkulu, Jambi, Palembang dan Jakarta. Marjin pemasaran yang diperoleh pengepul kecil dan besar mencapai 15 %.&nbsp; Produksi benih lobster yang melimpah di perairan Pantai Pesisir Barat Lampung sangat berpotensi untuk pengembangan budidaya pendederan lobster sebagai sumber ekonomi baru