Weight-length relationships for selected fish species of the small-scale demersal fisheries of the south and south-west coast of Portugal

Gonçalves, Jorge M. S.; Bentes, Luís; Lino, Pedro G.; Ribeiro, J.; Canário, Adelino V.M.; Erzini, Karim

doi:10.1016/s0165-7836(96)00569-3

Cited by 298 publications

(251 citation statements)

References 2 publications

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“…It may be useful to calculate a population's production and biomass (Anderson & Gutreuter, 1983) and check for seasonal variations in growth (Richter et al, 2000). It is also relevant for comparing the morphology between species or populations from different habitats and/or regions (Gonçalves et al, 1997). Positive allometry (b > 3) was observed for the length weight relationship of P. magdalenae as obtained by Camargo & Giarrizo (2009) in middle Xingu.…”

Section: Discussionmentioning

confidence: 69%

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

2010

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Plagioscion magdalenae (pacora) is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L 50 ), sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL) ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L 50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female). Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed.Plagioscion magdalenae (pescada-curuca) é um sciaenídeo bentopelágico, de importância comercial, amplamente distribuído na bacia do rio Amazonas. O objetivo deste trabalho foi descrever a biologia reprodutiva dessa espécie na baía do Marajó, estuário Amazônico, Brasil. Neste estudo foi determinado o estádio do desenvolvimento gonadal, tamanho de primeira maturação gonadal (L 50 ), proporção entre sexos, época e o tipo de desova. A coleta foi realizada bimestralmente no período de dezembro de 2005 a outubro de 2006. Foi examinado um total de 251 exemplares, variando entre 220 e 590 mm de comprimento total (CT). A relação peso-comprimento para fêmeas, machos e sexos agrupados foi altamente significativa, com alometria positiva. O L 50 foi de 279 mm considerando sexos agrupados, 305 e 269 mm CT para fêmeas e machos respectivamente. A proporção entre sexos para o total de indivíduos foi favorável aos machos (2,02 machos: 1 fêmea). Macroscopicamente, as gônadas foram classificadas em imatura, em maturação, matura e desovada. Considerando-se as avaliações macro e microscópicas das gônadas, foi registrado um período prolongado de desova, principalmente entre agosto e fevereiro.

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Section: Discussionmentioning

confidence: 69%

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

2010

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“…Stergiou (1997) and García-Díaz et al (1997) examined the spawning seasonality and the sex and reproductive aspects in Serranus cabrilla in the English Channel and the Canary Island, respectively. The length-weight relations for comber were presented by Gonçalves et al (1997) and Stergiou and Motopoulos (2001) in south-west coast of Portugal and Greek waters, respectively. Tserpes and Tsimenides (2001) reported data on the age, growth, and mortality of comber from the Cretan shelf.…”

Section: Introductionmentioning

confidence: 98%

Growth Characteristics and Reproduction of Comber, <I>Serranus Cabrilla</I> (Actinopterygii, Perciformes, Serranidae), in the Aegean Sea

Ilhan¹,

Akalın²,

Tosunoğlu³

et al. 2010

Acta Icth et Piscat

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“…LWRs are used to estimate the mean weight for a given length group and convert length observations into weights to provide a measure of biomass (Froese 2006, Froese et al 2011. LWRs also allow for life history and morphological comparisons between different fi sh species or between fi sh populations from different habitats and/or regions (Gonçalves et al 1997). Although LWRs of scorpionfi shes and righteye fl ounders inhabiting south-eastern coast of Korea have been reported (Baeck et al 2012(Baeck et al , 2014 Fish specimens were collected monthly from January to December 2006 off the south-eastern coast of Korea (35°15′~35°17′N, 129°18′~129°21′E) from depths between 30 and 60 m using a small otter trawl.…”

mentioning

confidence: 99%

Length–weight relations for 29 demersal fishes caught by small otter trawl on the south-eastern coast of Korea

Park¹,

Huh

2015

Acta Ichthyol. Piscat.

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Park J.M., Huh S.H. 2015. Length-weight relations for 29 demersal fi shes caught by small otter trawl on the south-eastern coast of Korea. Acta Ichthyol. Piscat. 45 (4): 427-431.Abstract. We present herewith the relations between total length and weight (LWRs) for 29 fi sh species from the southern coast of the East Sea (=Sea of Japan) The fi shes examined in the presently reported study were collected off the south-eastern coast of Korea. The study area, in terms of its environmental and geographical characteristics, differs generally from other coastal marine ecosystems in the east and south seas of Korea (Suh et al. 2001). It is a habitat for many commercially important demersal fi sh species and has been renowned for being abundant in prey organisms (Kim unpublished ** ). However, little is known on the ecology of the fi shes living in the area.Length-weight relation (LWR) parameters (a, b) are useful in the assessment of fi sh stocks and populations (Ricker 1968, Froese 2006. LWRs are used to estimate the mean weight for a given length group and convert length observations into weights to provide a measure of biomass (Froese 2006, Froese et al. 2011. LWRs also allow for life history and morphological comparisons between different fi sh species or between fi sh populations from different habitats and/or regions (Gonçalves et al. 1997). Although LWRs of scorpionfi shes and righteye fl ounders inhabiting south-eastern coast of Korea have been reported (Baeck et al. 2012(Baeck et al. , 2014 Fish specimens were collected monthly from January to December 2006 off the south-eastern coast of Korea (35°15′~35°17′N, 129°18′~129°21′E) from depths between 30 and 60 m using a small otter trawl. Fish samples were immediately packed with ice and taken to the laboratory for measurement of total length (TL) and wet weight to the nearest millimetre and gram, respectively. All scientifi c names were verifi ed following FishBase (Froese and Pauly 2015).For each species, the weight-length relation was determined based on the formula:where W is the wet weight [g], L is total length [cm], and a and b are the intercept and allometric coeffi cient, respectively. Parameters a and b were estimated using a simple linear regression analysis of log-transformed data. Extreme outliers were removed before fi tting the linear regression (Froese et al. 2011). The 95% confidence intervals (CIs) of parameters a and b and the statistical signifi cance level of r 2 were estimated using SYS-TAT software (Systat, version 12. SPSS, USA). LWRs were summarized over all months. Seasonal LWRs, each spring (March-May), summer (June-August), autumn (September-November), and winter (December-February), were also estimated for species where more than 30 specimens were collected for each season. Analysis of covariance (ANCOVA) was used to determine significant differences in the slopes of length-weight regressions between seasons.Length-weight regressions were applied to 16 456 specimens of the 29 species from 24 families. Comparing with information in Fish...

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Weight-length relationships for selected fish species of the small-scale demersal fisheries of the south and south-west coast of Portugal

Cited by 298 publications

References 2 publications

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

Growth Characteristics and Reproduction of Comber, <I>Serranus Cabrilla</I> (Actinopterygii, Perciformes, Serranidae), in the Aegean Sea

Length–weight relations for 29 demersal fishes caught by small otter trawl on the south-eastern coast of Korea

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