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Jorge Landa – One of the best experts on this subject based on the ideXlab platform.

  • Age and growth of Anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland) based on illicia age estimation.
    Fisheries Research, 2013
    Co-Authors: Jorge Landa, Joaquín Barrado, Francisco Velasco

    Abstract:

    Abstract The age of white Anglerfish ( Lophius piscatorius ) on the Porcupine Bank was estimated based on the age estimation of 979 illicia (first dorsal fin ray) obtained from a series of 9 annual groundfish surveys (2001–2009). Modifications in the methodology of illicia preparation and in the traditional biased age estimation criterion are presented. This is the first time that a growth pattern of white Anglerfish based on illicia age estimations can be indirectly validated by tracking cohorts using the abundance indices per age class from surveys and length-frequency analyses. Previous studies of cohort tracking using the traditional illicia age estimation criterion showed a mismatch, suggesting a faster growth. With the new proposed criteria, abundant cohorts from 2001 to 2004, and scarce ones, from 2005 to 2007, can be tracked over the time throughout several age groups. A new growth pattern and von Bertalanffy growth parameters are presented ( L ∞ : 162.31; k : 0.088; t 0 : −0.894). The results are compared with previous studies in other areas.

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  • Distribution, abundance, and growth of Anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland)
    ICES Journal of Marine Science, 2008
    Co-Authors: Francisco Velasco, Jorge Landa, Joaquín Barrado, M. Blanco

    Abstract:

    Velasco, F., Landa, J., Barrado, J., and Blanco, M. 2008. Distribution, abundance, and growth of Anglerfish (Lophius piscatorius) on the Porcupine Bank (west of Ireland). – ICES Journal of Marine Science, 65: 1316-1325.This manuscript presents the first results on abundance and distribution of white Anglerfish (Lophius piscatorius) from a series of groundfish surveys carried out on the Porcupine Bank. White Anglerfish were caught in all trawlable areas, recruits and juveniles mainly from the shallower parts of the bank, around the central mound and closer to the Irish shelf. A strong cohort was manifest in 2001, and it could be tracked over time by age matrices obtained with illicia age-length keys (ALKs) collected during the surveys. However, a mismatch in the cohort analysis suggests that the growth pattern based on illicia underestimates around three of the younger age classes. Using an ALK estimated numerically from a faster growth model, this mismatch disappears, which seems to confirm faster growth. Recruits of the 0-group and adults of age 4 (with the faster growth: ca. ∼57-65 cm) dominated, whereas the intermediate age groups were scarce on the bank. These results and recent findings from tag-and-recapture experiments suggest that white Anglerfish move to and from the Porcupine Bank, calling into question the stock boundaries currently accepted for the species in the North Atlantic.

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  • Application of dynamic factor analysis in the assessment of Iberian Anglerfish stocks
    ICES Journal of Marine Science, 2008
    Co-Authors: Manuela Azevedo, Jorge Landa, Rafael Duarte, Fátima Cardador, Pedro Sousa, Celso Fariña, Paz Sampedro, Gersom Costas

    Abstract:

    Azevedo, M., Duarte, R., Cardador, F., Sousa, P., Farina, C., Sampedro, P., Landa, J., and Costas, G. 2008. Application of dynamic factor analysis in the assessment of Iberian Anglerfish stocks. – ICES Journal of Marine Science, 65: 1362-1369.Dynamic factor analysis (DFA) was applied to six time-series of catch per unit effort data of the Iberian (ICES Divisions VIIIc and IXa) white Anglerfish (Lophius piscatorius) and black Anglerfish (L. budegassa). Results showed that grouping the abundance indices reflected the fleet’s area of exploitation and fish size selection. Two common trends (CTs) were extracted for each species, capturing the main signal of abundance over time. The white Anglerfish was assessed using these CTs as input to the biomass dynamic model currently used in the ICES assessment, to investigate whether the approach would reduce the uncertainty in parameter estimates and related quantities. Using the CTs, bias estimates are lower. The current perception of an overexploited stock is unchanged, but a much lower intrinsic rate of biomass increase was estimated, indicating that the biomass recovery might be much slower. A lower maximum sustainable yield, ∼3600 t, was obtained, and this is more consistent with the historical landings trajectory. The application of DFA to stock assessment of Anglerfish, presented here for the first time, can be extended to age-based assessments.

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Joachim Spiess – One of the best experts on this subject based on the ideXlab platform.

  • processing of an Anglerfish somatostatin precursor to a hydroxylysine containing somatostatin 28 pancreatic islets hydroxylation thermolysin automatic edman degradation reversed phase high pressure liquid chromatography
    , 2016
    Co-Authors: Joachim Spiess, Bryan D Noett

    Abstract:

    A novel 28-residue somatostatin (SS) has been isolated from Anglerfish pancreatic islets and character- ized by complete Edman degradation, peptide mapping, and amino acid analysis. The primary structihre of this Anglerfish SS-28 (aSS-28) containing hydroxylysine (Hyl) was established to be H-Ser-Val-Asp-Ser-Thr-Asn-Asn-Leu-Pro-Pro-Arg-Glu- Arg-Lys-Ala-Gly-Cys-Lys-Asn-Phe-Tyr-Trp-Hyl-Gly- Phe-Thr-Ser-Cys-OH. This sequence (with the exception of hy- droxylysine-23, which is replaced by lysine) is identical to the sequence of the COOH-terminal 28 residues of prepro-SS II predicted on the basis of cDNA analysis (Hobart, P., Craw- ford, R., Shen, L., Pictet, R. & Rutter, W. J. (1980) Nature (Londont) 288, 137-141). This is the first instance in which hydroxylysine (to date characteristically observed in collagen or collagen-like structures) has been found in a potential regu- latory peptide. Chromatographic characterization of peptides, radiolabeled in islet culture, revealed that aSS-28 contained 10-12% of the radioactivity incorporated into the 8000- to 1000-dalton SS-like polypeptides, whereas 88-90% of this ra- dioactivity was detected in Anglerfish SS-14. It appears proba- ble that aSS-28. represents the predominant primary cleavage product derived from prepro-SS II by cleavage at the COOH- terminal side of a single arginine. Based on knowledge of the collagen biosynthesis, it is speculated that hydroxylation may take place as an early post-translational event.

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  • Processing of an Anglerfish somatostatin precursor to a hydroxylysine-containing somatostatin 28 (pancreatic islets/hydroxylation/thermolysin/automatic Edman degradation/reversed-phase high-pressure liquid chromatography)
    , 2016
    Co-Authors: Joachim Spiess, Bryan D Noett

    Abstract:

    A novel 28-residue somatostatin (SS) has been isolated from Anglerfish pancreatic islets and character- ized by complete Edman degradation, peptide mapping, and amino acid analysis. The primary structihre of this Anglerfish SS-28 (aSS-28) containing hydroxylysine (Hyl) was established to be H-Ser-Val-Asp-Ser-Thr-Asn-Asn-Leu-Pro-Pro-Arg-Glu- Arg-Lys-Ala-Gly-Cys-Lys-Asn-Phe-Tyr-Trp-Hyl-Gly- Phe-Thr-Ser-Cys-OH. This sequence (with the exception of hy- droxylysine-23, which is replaced by lysine) is identical to the sequence of the COOH-terminal 28 residues of prepro-SS II predicted on the basis of cDNA analysis (Hobart, P., Craw- ford, R., Shen, L., Pictet, R. & Rutter, W. J. (1980) Nature (Londont) 288, 137-141). This is the first instance in which hydroxylysine (to date characteristically observed in collagen or collagen-like structures) has been found in a potential regu- latory peptide. Chromatographic characterization of peptides, radiolabeled in islet culture, revealed that aSS-28 contained 10-12% of the radioactivity incorporated into the 8000- to 1000-dalton SS-like polypeptides, whereas 88-90% of this ra- dioactivity was detected in Anglerfish SS-14. It appears proba- ble that aSS-28. represents the predominant primary cleavage product derived from prepro-SS II by cleavage at the COOH- terminal side of a single arginine. Based on knowledge of the collagen biosynthesis, it is speculated that hydroxylation may take place as an early post-translational event.

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  • Comparison of Prohormone-process ing Activities in Islet Microsomes and Secretory Granules: Evidence for Distinct Converting Enzymes for Separate Islet Prosomatostatins
    , 2013
    Co-Authors: Bryan D. Noe, Gail Debo, Joachim Spiess

    Abstract:

    ABSTRACT In previous work we have examined the nature of converting enzymes for proinsulin, proglucagon, and prosomatostatin-I (PSS-I) in Secretory granules isolated from Anglerfish islets. The purpose of the present study was to extend the examination of precursor conversion to islet microsomes and to compare prohormone processing, including that of PSS-I and prosomatostatin-II (PSS-II), in islet Secretory granules and microsomes. Microsomes (rough endoplasmic reticulum [RER] and Golgi complex) and Secretory granules were prepared from Anglerfish islets by differential and discontinuous density-gradient centrifugation. Microsomes were further fractionated into Golgi- and RER-enriched subtractions. Lysed Secretory granule or microsome preparations were incubated in the presence of a mixture of radioactively labeled islet prohormones. Extracts of products generated were subjected to analysis by gel filtration and high-pressure liquid chromatography. Accuracy of product cleavage was monitored by comparing high-pressure liquid chromatography retention times from the radiolabeled in vitro conversion products with the retention times of labeled products from tissue extracts. All converting activity in microsomes was found to be similar to that in granules in that i

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Rafael Duarte – One of the best experts on this subject based on the ideXlab platform.

  • Application of dynamic factor analysis in the assessment of Iberian Anglerfish stocks
    , 2016
    Co-Authors: Manuela Azevedo, Rafael Duarte, Pedro Sousa, Paz Sampedro, Jorge L, Gersom Costas

    Abstract:

    Dynamic factor analysis (DFA) was applied to six time-series of catch per unit effort data of the Iberian (ICES Divisions VIIIc and IXa) white Anglerfish (Lophius piscatorius) and black Anglerfish (L. budegassa). Results showed that grouping the abundance indices reflected the fleet’s area of exploitation and fish size selection. Two common trends (CTs) were extracted for each species, capturing the main signal of abundance over time. The white Anglerfish was assessed using these CTs as input to the biomass dynamic model currently used in the ICES assessment, to investigate whether the approach would reduce the uncertainty in parameter estimates and related quantities. Using the CTs, bias estimates are lower. The current perception of an overexploited stock is unchanged, but a much lower intrinsic rate of biomass increase was estimated, indicating that the biomass recovery might be much slower. A lower maximum sustainable yield, 3600 t, was obtained, and this is more consistent with the historical landings trajectory. The application of DFA to stock assessment of Anglerfish, presented here for the first time, can be extended to age-based assessments

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  • Monkfish/Anglerfish across the world; common problems and common solutions: an introduction to papers presented at the ICES Theme Session in September 2007
    ICES Journal of Marine Science, 2008
    Co-Authors: Jean-jacques Maguire, Rafael Duarte, Pilar Pereda, Helen Dobby, Manuela Azevedo

    Abstract:

    Maguire, J-J., Pereda, P., Duarte R., Dobby, H., and Azevedo, M. 2008. Monkfish/Anglerfish across the world; common problems and common solutions: An introduction to papers presented at the ICES Theme Session in September 2007. – ICES Journal of Marine Science, 65: 1270-1271.

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  • Application of dynamic factor analysis in the assessment of Iberian Anglerfish stocks
    ICES Journal of Marine Science, 2008
    Co-Authors: Manuela Azevedo, Jorge Landa, Rafael Duarte, Fátima Cardador, Pedro Sousa, Celso Fariña, Paz Sampedro, Gersom Costas

    Abstract:

    Azevedo, M., Duarte, R., Cardador, F., Sousa, P., Farina, C., Sampedro, P., Landa, J., and Costas, G. 2008. Application of dynamic factor analysis in the assessment of Iberian Anglerfish stocks. – ICES Journal of Marine Science, 65: 1362-1369.Dynamic factor analysis (DFA) was applied to six time-series of catch per unit effort data of the Iberian (ICES Divisions VIIIc and IXa) white Anglerfish (Lophius piscatorius) and black Anglerfish (L. budegassa). Results showed that grouping the abundance indices reflected the fleet’s area of exploitation and fish size selection. Two common trends (CTs) were extracted for each species, capturing the main signal of abundance over time. The white Anglerfish was assessed using these CTs as input to the biomass dynamic model currently used in the ICES assessment, to investigate whether the approach would reduce the uncertainty in parameter estimates and related quantities. Using the CTs, bias estimates are lower. The current perception of an overexploited stock is unchanged, but a much lower intrinsic rate of biomass increase was estimated, indicating that the biomass recovery might be much slower. A lower maximum sustainable yield, ∼3600 t, was obtained, and this is more consistent with the historical landings trajectory. The application of DFA to stock assessment of Anglerfish, presented here for the first time, can be extended to age-based assessments.

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