The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Nicholas K. Dulvy - One of the best experts on this subject based on the ideXlab platform.
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Life in 3-D: life history strategies in tunas, Mackerels and bonitos
Reviews in Fish Biology and Fisheries, 2013Co-Authors: Maria José Juan-jordá, Iago Mosqueira, Juan Freire, Nicholas K. DulvyAbstract:The scombrids (tunas, bonitos, Spanish Mackerels and Mackerels) sustain some of the most important fisheries in the world and their sustainable management depends on better understanding of their life history strategies. Here, we first assemble life history information on maximum size, growth, longevity, maturity, fecundity and spawning duration and interval for all scombrid species. Second we characterize their life history patterns and trait co-variation and evaluate how many principal axes of trait variation underlie scombrid life history strategies. Most of their life history variation can be explained along three axes or dimensions: size, speed, and reproductive schedule. Body size governs the first axis ranking species along a small-large continuum. The second axis was mostly influenced by time-related traits, such as longevity, growth rates, spawning duration, time between spawning events, ranking species along a slow-fast continuum of life histories. Scombrid species with the slowest life histories such as Atlantic bluefin tuna Thunnus thynnus and Atlantic Mackerel Scomber scombrus tend to inhabit more temperate waters while species with faster life histories such as yellowfin tuna Thunnus albacares and short Mackerel Rastrelliger brachysoma are typically found in more tropical waters. The third axis comprises the negative relationship between number of eggs produced at length of maturity and rate in gain of fecundity with size describing the schedule of reproductive allocation which reflects a fundamental trade-off between reproduction and growth. Finally, in addition we show that the life history strategies of scombrids conform more closely to the Periodic and Opportunistic strategists within the triangular model of fish life histories.
Graham J Pierce - One of the best experts on this subject based on the ideXlab platform.
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anisakis species composition and infection characteristics in atlantic Mackerel scomber scombrus from major european fishing grounds reflecting changing fish host distribution and migration pattern
Fisheries Research, 2017Co-Authors: Arne Levsen, Paolo Cipriani, Simonetta Mattiucci, Lee C Hastie, K Mackenzie, Graham J PierceAbstract:Abstract Atlantic Mackerel ( Scomber scombrus ) ranks among the most valuable fish species in Europe. The NE Atlantic Mackerel population is considered to comprise three main stocks (southern, western and North Sea), with variable proportions of these three intermixing at the northerly feeding grounds. The southern and western Mackerel stocks have moved over the past 4–5 years further north- and westward. Consequently, large-scale Mackerel fishing and processing have become thriving industries in Iceland and the Faroe Islands in just a few years. The Mackerel population structure in the Mediterranean Sea is less well known but seems to comprise at least one, more or less isolated, spawning component. Although Mackerel is an important food resource, systematic and concerted epidemiological surveys of Anisakis species in Atlantic Mackerel from European fishing grounds have been lacking. As part of the EU FP7 PARASITE project (GA no. 312068), occurrence and specific identity of Anisakis spp. from 1801 Mackerel from Northeast Atlantic and Mediterranean waters was investigated. In general, Mackerel caught at the Atlantic fishing grounds exhibited markedly higher Anisakis spp. infection levels than fish from the Mediterranean localities. Mackerel caught off NW Spain and Portugal (ICES VIIIc, IXa) showed highest overall and muscular prevalence, reaching 87% and 52%, respectively, which differed significantly from all other Atlantic samples. Lowest overall Anisakis spp. prevalence and abundance was recorded in Mackerel from Faroe Isles waters, while lowest muscular infection levels were found in the samples from the North Sea. Genetic nematode species identification showed that A. simplex ( sensu stricto ) is the dominating species in Mackerel from the Atlantic areas, while A. pegreffii dominated in the samples from the Mediterranean Sea. The latter species showed generally low prevalence and intensity in the flesh, not exceeding 6% and one larva, respectively. While A. simplex (s. s.) and A. pegreffii seem to co-occur in Mackerel from off NW Spain and Portugal, several A. pegreffii were also recorded in Mackerel from the North- and Norwegian Seas. These findings imply that the actual Mackerel started their feeding migration in waters south to the British Isles, which include parts of the sympatric area of the two sibling species. Thus, A. pegreffii could prove a useful supplementary marker to track migration routes of the different Mackerel stock components in NE Atlantic waters.
Akinori Takasuka - One of the best experts on this subject based on the ideXlab platform.
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spatio temporal model reduces species misidentification bias of spawning eggs in stock assessment of spotted Mackerel in the western north pacific
Fisheries Research, 2021Co-Authors: Yuki Kanamori, Ryuji Yukami, Shota Nishijima, Hiroshi Okamura, Mikio Watai, Akinori TakasukaAbstract:Abstract Species identification based on morphological characteristics includes species misidentification, leading to estimation bias in stock assessment and posing challenges difficult to be resolved. The spawning eggs of spotted Mackerel Scomber australicus and chub Mackerel S. japonicus in the western North Pacific are used for stock assessment as an index of spawning biomass and are classified based on egg diameter by past evidence. However, the difference in the distribution of egg diameters between the two species has become so ambiguous that the spawning eggs of chub Mackerel may be classified as spotted Mackerel. This can be explained by the larger distribution of egg diameters in chub Mackerel with increasing stock abundance, resulting in overlap with the distribution of egg diameters in spotted Mackerel. This leads to species misidentification and biased estimates of spotted Mackerel abundance. To overcome this bias, it is necessary to develop a standardization method to remove the effect of species misidentification. Here, we demonstrate that a recently-developed spatio-temporal model can easily and efficiently reduce estimation bias for egg density and stock abundance in the spotted Mackerel, using 15 years data for spawning eggs. We incorporated species identification error as the effect of the egg density of chub Mackerel on the catchability of spotted Mackerel in the spatio-temporal model. The index estimated from the model decreased temporal fluctuation substantially. When using the index accounting for species misidentification, the retrospective bias of abundance estimates for spotted Mackerel decreased by about half compared with using the indices that ignored species misidentification. These results suggest that incorporating species misidentification bias is an essential process for improving stock assessment.
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Predation dynamics of Mackerel on larval and juvenile anchovy: is capture success linked to prey condition?
Fisheries Science, 2010Co-Authors: Dominique Robert, Akinori Takasuka, Sayaka Nakatsuka, Hiroshi Kubota, Yoshioki Oozeki, Hiroshi Nishida, Louis FortierAbstract:We tested whether the predation dynamics of chub Mackerel Scomber japonicus and spotted Mackerel S. australasicus on young anchovy Engraulis japonicus relates to individual growth characteristics of the prey and could account for the growth-selective survival predicted by recruitment hypotheses. Juvenile and adult Mackerel were sampled along with their young anchovy prey field in 2004 (juvenile Mackerel and larval anchovy) and 2005 (adult Mackerel and juvenile anchovy) off the Pacific coast of Honshu, Japan. The recent 5-day mean growth rate of larval and juvenile survivors and prey found in the stomach of Mackerel was estimated from the otolith microstructure. No significant difference was found between the recent growth of larval or juvenile survivors and that of preyed individuals. We conclude that despite a relatively small body size, the high activity level and predation skills displayed by Mackerel prevent fast-growing larvae and early juveniles from benefitting in terms of the expected survival advantage over slow-growers. Hence, growth-selective predation mortality of larval fish would depend on the feeding ecology of the predator rather than predator size. Selection for fast growth is more likely to occur under predation pressure from invertebrate organisms and small pelagic fish specialized on zooplankton, such as herring and anchovy.
Worawan Panpipat - One of the best experts on this subject based on the ideXlab platform.
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Gel properties of croaker–Mackerel surimi blend
Food Chemistry, 2010Co-Authors: Worawan Panpipat, Manat ChaijanAbstract:Abstract Gel properties of croaker surimi blended with three types of Mackerel surimi at different ratios were evaluated. The gel strength of the croaker–Mackerel surimi blend was higher than that of the original Mackerel surimi ( p p > 0.05). The addition of short-bodied Mackerel surimi into croaker surimi up to a ratio of 1:2 had no effect on whiteness and metmyoglobin content of the gel ( p > 0.05). Marked decrease in expressible drip and TCA-soluble peptide of gel was noticeable in croaker–frigate Mackerel surimi blend ( p
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physicochemical properties and gel forming ability of surimi from three species of Mackerel caught in southern thailand
Food Chemistry, 2010Co-Authors: Manat Chaijan, Worawan PanpipatAbstract:Abstract Physicochemical and gelation properties of surimi prepared from three species of Mackerel were investigated. The highest whiteness with the lowest redness index corresponding to the lowest myoglobin content especially its oxidised form, metmyoglobin, was found in short-bodied Mackerel ( Rastrelliger brachysoma ) surimi ( p Auxis thazard ) surimi contained the highest lipid content ( p 2+ -ATPase activity was found in natural actomyosin extracted from short-bodied Mackerel surimi ( p p p Rastrelliger kanagurta ) and short-bodied Mackerel but not for frigate Mackerel. The highest metmyoglobin content with the lowest whiteness was found in frigate Mackerel surimi gel ( p
Manat Chaijan - One of the best experts on this subject based on the ideXlab platform.
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Gel properties of croaker–Mackerel surimi blend
Food Chemistry, 2010Co-Authors: Worawan Panpipat, Manat ChaijanAbstract:Abstract Gel properties of croaker surimi blended with three types of Mackerel surimi at different ratios were evaluated. The gel strength of the croaker–Mackerel surimi blend was higher than that of the original Mackerel surimi ( p p > 0.05). The addition of short-bodied Mackerel surimi into croaker surimi up to a ratio of 1:2 had no effect on whiteness and metmyoglobin content of the gel ( p > 0.05). Marked decrease in expressible drip and TCA-soluble peptide of gel was noticeable in croaker–frigate Mackerel surimi blend ( p
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physicochemical properties and gel forming ability of surimi from three species of Mackerel caught in southern thailand
Food Chemistry, 2010Co-Authors: Manat Chaijan, Worawan PanpipatAbstract:Abstract Physicochemical and gelation properties of surimi prepared from three species of Mackerel were investigated. The highest whiteness with the lowest redness index corresponding to the lowest myoglobin content especially its oxidised form, metmyoglobin, was found in short-bodied Mackerel ( Rastrelliger brachysoma ) surimi ( p Auxis thazard ) surimi contained the highest lipid content ( p 2+ -ATPase activity was found in natural actomyosin extracted from short-bodied Mackerel surimi ( p p p Rastrelliger kanagurta ) and short-bodied Mackerel but not for frigate Mackerel. The highest metmyoglobin content with the lowest whiteness was found in frigate Mackerel surimi gel ( p
