Spawning season, fecundity and proximate composition of the gonads of wild-caught blacklip abalone (Haliotis rubra) from Port Fairy waters, south eastern Australia

Litaay, Magdalena

doi:10.1016/s0990-7440(03)00067-6

Cited by 46 publications

(44 citation statements)

References 36 publications

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“…The highest value of lipid among all the tissues was in the ripe ovary (26.49%). In H. rubra, the gonad lipid content was as high as 40.4% during the peak breeding season (Litaay & De Silva 2003). During oogenesis and spermatogenesis there is a rapid increase in lipid and protein in the gonad, as reported for scallop (Barber & Blake 1991) and oyster (Soudant et al 1996).…”

Section: Discussionmentioning

confidence: 53%

“…Ovarian lipid content also increases as maturation advances and declines gradually towards the spent stage. Among all the tissues analysed, the highest value of protein was observed in the foot muscle of H. varia, as noted in most bivalves and gastropods, and it is a little higher than that of the other abalone species reported (Litaay & De Silva 2003). Previous studies have reported that much of the energy resources of molluscs are stored in the foot muscle (Pazos et al 1997;Berthelin et al 2000) and the digestive gland (Sastry & Blake 1971;Berthelin et al 2000).…”

Section: Discussionmentioning

confidence: 70%

“…The digestive gland crosssection area of abalone usually remains constant throughout the year as compared with the gonad section area, which fluctuates from month to month according to their annual reproductive cycle. However, many studies have reported that the digestive gland will increase in size corresponding to the decrease in the size of the gonad, suggesting that material might be transported from the digestive gland to the gonad (Boolootian et al 1962;Litaay & De Silva 2003). Such transfer of nutrients from storage or digestive sites to the gonad has been inferred or demonstrated in a number of other groups of molluscs, including bivalve species (Ansell 1974;Gabbott 1975;Le Pennec et al 1991).…”

Section: Discussionmentioning

confidence: 98%

“…In the present study, the Pearson correlation showed a significant inverse relationship between the GSI and the HSI, both seasonally and between gonad maturation stages. Litaay & De Silva (2003) reported that the digestive gland of the blacklip abalone H. rubra acts a nutrient store, and as maturation proceeds nutrients are drawn from the digestive gland, resulting in the lowering of the HSI. The negative relationship of the GSI and the HSI in H. varia can be further explained by the variation in some of the biochemical constituents, especially protein and lipid in the gonad as well as in the digestive gland.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to the voluminous studies on oysters and other lamellibranchs, biochemical studies on gastropods are limited. Some of the available literature elucidates various aspects of the biochemical composition of limpets (Barry & Munday 1959;Blackmore 1969), snails (Giese 1967;Oates et al 1990;Carasco et al 2006) and abalone (Mercer et al 1993;Knauer et al 1994;Chiou et al 2001Chiou et al , 2002Litaay & De Silva 2003). Chemical investigations of abalone body components, especially the biochemical composition of foot muscle and its texture properties (Hatae et al 1995) are of great significance because of their high commercial value in the international market (Guo et al 1999).…”

Section: Introductionmentioning

confidence: 99%

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Variation in biochemical composition during gonad maturation of the tropical abaloneHaliotis variaLinnaeus 1758 (Vetigastropoda: Haliotidae)

Najmudeen

2007

Marine Biology Research

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Biochemical changes in the body components during gonad maturation of the tropical abalone Haliotis varia were investigated using wild collected specimens from the Gulf of Mannar, on the southeast coast of India. The gonadosomatic index (GSI) and the hepatosomatic index (HSI) showed negative correlations throughout the study period as well as during the progression of gonad maturation stages. The highest GSI for both the sexes were in the ripe stages followed by late maturing stages. The HSI ranged from 2.97 to 6.71 in females, and 3.55 to 5.09 in males. Among the biochemical components analysed, lipid and carbohydrate contents showed significant variations in the different tissues of H. varia during the progress of gonad maturation. The highest protein content was in the foot muscle and the lowest was in the digestive gland. Total lipids in the ovary were always higher compared with that of the testis and the values ranged from 12.60 to 26.49%, registering the highest value in the ripe ovary. Gonad carbohydrate content was lower when the lipid content was higher, suggesting the conversion of carbohydrate to lipids. The present study demonstrates the role of nutrient translocation between body parts as an essential part of the reproductive physiology of abalone.

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Section: Discussionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Variation in biochemical composition during gonad maturation of the tropical abaloneHaliotis variaLinnaeus 1758 (Vetigastropoda: Haliotidae)

Najmudeen

2007

Marine Biology Research

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Folding versus Self‐Assembling

Wang

2003

Chemistry A European J

220

165

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Model foldable polymers with sequences of rigid hydrophobic chromophores and flexible hydrophilic tetra(ethylene glycol) were synthesized and used as a paradigm for studying molecular-folding and self-assembly phenomena. Our results demonstrate that intramolecular association or folding prevails over intermolecular interaction or self-assembling in the concentration region from 1 microM to 0.1 M. Importantly, folded polymeric nanostructures have absorption and fluorescence properties that are distinct from those of unfolded polymers or free monomers. We hypothesize that the origins of folding and self-assembly come from interactions between molecular units, and that the key parameter that regulates the on-and-off of such interactions is the distance R separating the two molecular units. Each molecular unit produces a characteristic force field, and when another molecular unit enters this field, the probability that the two units will interact increases significantly. A preliminary estimate of the radius of such a force field for the perylene tetracarboxylic diimide chromophore is about 90-120 A. As a result, phenomena associated with folding or self-assembly of molecular species are observed when these conditions are met in solution.

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Local connections and the larval competency strongly influence marine metapopulation persistence

Cecino

Treml

2021

Ecological Applications

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The relationship between metapopulation stability and connectivity has long been investigated in ecology, however, most of these studies are focused on theoretical species and habitat networks, having limited ability to capture the complexity of real-world metapopulations. Network analysis became more important in modeling connectivity, but it is still uncertain which network metrics are reliable predictors of persistence. Here we quantify the impact of connectivity and larval life history on marine metapopulation persistence across the complex seascape of southeast Australia. Our work coupled network-based approaches and eigenanalysis to efficiently estimate metapopulation-wide persistence and the subpopulation contributions. Larval dispersal models were used to quantify species-specific metapopulation connectivity for five important fisheries species, each summarized as a migration matrix. Eigenanalysis helped to reveal metapopulation persistence and determine the importance of nodelevel network properties. Across metapopulations, the number of local outgoing connections was found to have the largest impact on metapopulation persistence, implying these hub subpopulations may be the most influential in real-world metapopulations. Results also suggest the length of the pre-competency period may be the most influential parameter on metapopulation persistence. Finally, we identified two major hot spots of local connectivity in southeast Australia, each contributing strongly to multispecies persistence. Managers and ecologists would benefit by employing similar approaches in making more efficient and more ecologically informed decisions and focusing more on local connectivity patterns and larval competency characteristics to better understand and protect real-world metapopulation persistence. Practically this could mean developing more marine protected areas at shorter distances and supporting collaborative research into the early life histories of the species of interest.

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Spawning season, fecundity and proximate composition of the gonads of wild-caught blacklip abalone (Haliotis rubra) from Port Fairy waters, south eastern Australia

Cited by 46 publications

References 36 publications

Variation in biochemical composition during gonad maturation of the tropical abaloneHaliotis variaLinnaeus 1758 (Vetigastropoda: Haliotidae)

Variation in biochemical composition during gonad maturation of the tropical abaloneHaliotis variaLinnaeus 1758 (Vetigastropoda: Haliotidae)

Folding versus Self‐Assembling

Local connections and the larval competency strongly influence marine metapopulation persistence

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