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Damage, recovery and survival of 0-group mulloway, Argyrosomus japonicus, after simulated escape through square mesh (2005)

Miller, M. E. ; Broadhurst, M. K. ; Barker, D. T. ; [et al.]

Berlin, Germany : Blackwell Verlag GmbH

Journal of applied ichthyology 21 (2005), S. 0

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ISSN: 1439-0426

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: A laboratory experiment was carried out to quantify and compare the physical damage (measured as scale loss), recovery and survival of two size categories [small: 48–85 mm total length (TL); large: 78–148 mm TL] of 0-group mulloway, Argyrosomus japonicus, after simulated escape through square-shaped mesh (bar length of 21.5 mm). Regardless of their size, fish that were fatigued to exhaustion and forced through square meshes sustained significantly more (i.e. 〉1.8 times) scale loss than did control fish that were only fatigued. However, the total scale loss incurred was 〈5% and significantly improved 7 days after treatment. Survival rates over a 2-week observation period were 100 and 〉97% for treatment and control fish, respectively. The results support the utility of square mesh for reducing the prawn-trawl fishing mortality of unwanted bycatch.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1439-0426.2004.00598.x

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Plant gene expression in effective and ineffective root nodules of alfalfa (Medicago sativa) (1987)

Lullien, V. ; Barker, D. G. ; Lajudie, P. ; [et al.]

Springer

Plant molecular biology 9 (1987), S. 469-478

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ISSN: 1573-5028

Keywords: in vitro translation ; leghemoglobin ; nodulin gene expression ; Northern analysis ; Rhizobium-alfalfa symbiosis

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Expression of plant genes involved in the symbiosis between alfalfa (Medicago sativa) and Rhizobium meliloti has been studied by comparing root and root nodule mRNA populations. Two-dimensional gel electrophoretic separation of the in vitro translation products of polyA+ RNA isolated from either roots or effective root nodules has allowed us to identify thirteen nodule-specific translation products, including those corresponding to the leghemoglobins (Lb). These translation products, representing putative nodulin mRNAs, are first detected between 9 and 12 days after inoculation, a result which has been confirmed for Lb mRNA by Northern blotting and hybridization with a Lb cDNA probe. Analysis of three different types of ineffective root nodules arrested in different stages of development has led to the following conclusions. (i) The transcription of eleven nodule-specific genes, including the Lb genes, is independent of nitrogen-fixing activity. (ii) Differentiation of the primary nodule structure does not require the transcription of any of these genes but can be correlated with a dramatic reduction in the level of at least five transcripts present in the root. (iii) There is enhanced expression of certain plant genes in the case of nodules elicited by an Agrobacterium strain carrying the symbiotic plasmid of R. meliloti.