Composition and length‐weight relationships of fish species in Lake Erhai,southwestern China

Length–weight relationships (LWRs) are described for 23 fish species (five indigenous species and 18 exotic species) in Lake Erhai, a plateau deep lake located in southwestern China. Four different types of fishing gear were used in order to include all possible length ranges from 2009 to 2012. Results show that the exponent b ranged from 2.72 to 3.79. The length of the growth inflection point between juveniles and females of Pseudorasbora parva and Micropercops swinhonis coincides with the length at which 50% of the females are sexually mature, respectively. The LWRs of P. parva and M. swinhonis are affected by sexual dimorphism, and Hemiculter leucisculus shows significant differences between juveniles and females. In addition, the first LWR records for nine species are provided in this study.     

Length–weight and length–length relationships of 139 Indo‐Pacific fish species (Teleostei) from the Davao Gulf,Philippines

Length–weight relationships (LWRs) of 139 coral reef and pelagic fish species (representing 34 fish families) were calculated based on 3806 individuals measured at local fish markets near the Davao Gulf in the southern Philippines during weekly visits between March 2009 and July 2011, as well as in June 2012. Fishes were caught with a variety of fishing methods, corroborated by abrasions and injuries. Forty‐seven of 139 LWRs were firstly reported and new to science. The mean slope b of the LWRs was 3.035, indicating that the majority of studied species followed isometric growth. Standard length – total length relationships were calculated for all measured fish species. Additionally, standard length – fork length relationships are presented for 108 species. Moreover, fifteen new records of maximum fish length and weight are reported.     

Length–weight relationships of 43 fish species from Haizhou Bay,central Yellow Sea

Specimens of 43 fish species belonging to 25 families were collected from seasonal bottom trawl surveys in Haizhou Bay from March to December 2011. The length–weight relationships (LWRs) of these fish species were estimated, with 22 species presented for the first time. Maximum total length records of ten species exceeded those in FishBase. The effects of sex, season and growth phase on the relationships for some of these species were taken into account whereby one species had significantly (P < 0.05) different LWRs by sex, and eight species exhibited significantly different LWRs by season. Two different growth stanzas were detected for two species using the double‐logarithmic plot of body weight versus total length.     

Length–weight and length–length relationships of 26 fish species from the Yiluo River,a tributary of the Yellow River,China

From February to October 2016, a total of 9,754 fish specimens were collected from the Yiluo River, a tributary of the Yellow River, China's second longest river. Based on these samples, length–weight relationships (LWRs) and length–length relationships (LLRs) were estimated for 26 species. Among these data, LWRs for 1 species, LLRs for 11 species, and maximum total lengths for six species were not previously recorded in FishBase. The a values of the LWRs varied between 0.0019 and 0.0116, and b values from 2.805 to 3.883. All regressions for LWRs and LLRs were highly significant (p < .001). These results will be useful for sustainable management and conservation of the fish resources in the Yiluo River and the Yellow River ecosystem.     

Length–weight relationships of fish species caught by bottom trawl in Jiaozhou Bay,China

Length–weight relationships (LWRs) were estimated for 31 fish species caught by bottom trawl surveys in Jiaozhou Bay on the west coast of the south Yellow Sea. Specimens were collected from September 2008 to August 2009 at monthly intervals. This study presents the first reference on LWRs for 15 of these species and new records of maximum total length for two species. Most of the b values fell within the expected range of 2.5–3.5. The mean value of b was 3.094 ± 0.064 (95% CL), which was significantly larger than 3.0, indicating a slight but significant tendency towards positive allometric growth in most of the fishes. Effects of the sex, season and growth phase were taken into account in this study. Results showed significantly different relationships between males and females in three of the species. Four species were found to have highly significant seasonal differences in the regression slope of b. Two different growth stanzas were detected using the double‐logarithmic plot of body weight vs total length for three species. The finding that the absolute residuals of b from 3.0 would become smaller with the increase in length‐range used was confirmed in this study.     

Length–weight and length–length relationships of 11 fish species from Zhimai River estuary,China

The present work provides the length–weight relationships (LWRs) and total length – standard length relationships (LLRs) of 11 fish species belonging to six families. The fishes were collected from seasonal bottom trawl surveys in the Zhimai River estuary, March 2011 to May 2013. This is the first record of LWRs and LLRs for several of the fish species in this area.     

Length–weight relationships of four freshwater fishes from the Geoje‐island in South Korea

The length–weight relationships (LWRs) for four freshwater fish species in catchment area of Geoje‐island, South Korea, were analyzed. Fish samples were collected quarterly using scoop‐nets (5 mm mesh size), casting nets (7 mm mesh size) from 2016 to 2017. LWRs data for three of these species have not yet been listed in FishBase.     

Length–weight relationships for four stingray species from the tropical Atlantic Ocean

This study provides separate length–weight relationships (LWRs) for males, females and pooled individuals for four stingray species (Dasyatis guttata, Dasyatis marianae, Gymnura micrura, and Rhinoptera bonasus) found in the tropical Atlantic. The specimens were sampled monthly between April 2009 and February 2011 along the coast of Alagoas, northeastern Brazil, using different fishing gear. For three species, the LWR parameters are reported for the first time, including D. marianae, an endemic species.     

Length‐weight relationships for 55 freshwater fish species from the Iguatemi River,Upper Paraná River basin,Brazil

This study reports the length‐weight relationship estimatives (LWRs) for 55 fish species caught in the Iguatemi River drainage, Upper Paraná River Basin, Mato Grosso do Sul State, Brazil. The LWRs of 15 of the species are provided for the first time.     

Length–weight relationships of five fish species associated with krill fishery in the Atlantic sector of the Southern Ocean

Length–weight relationships (LWRs) of five fish species commonly associated with Antarctic krill fishery, were determined. Samples were collected with Chinese krill trawler (codend mesh size 2 cm) in the Atlantic sector of the Southern Ocean from January to August 2016. Data on LWRs and the relationships between weight and standard length as well as weight and total length of those species were updated for the database of FishBase. Those data on fish species derived from Antarctic krill fishery will be very helpful in understanding the interaction between krill fishery and the associated fish community.     

Length–weight relationships of six elasmobranch species captured at the artisanal fishery of Margarita Island,Venezuela

This study reports the length – weight relationship (LWR) for five batoid and one shark species, all frequently captured by the artisanal commercial fishery on Margarita Island (10º44’ – 11º10’N and 63º46’ – 64º13’W), Venezuela. In 2013, elasmobranchs captured by the artisanal fleet (using bottom gillnets 200–400 m in length with 5–8 inch mesh size) were identified, sized, weighed and sexed. The value of a ranged from 0.0006 to 0.0351, meanwhile the b value ranged from 2.84 (for pooled Myliobatis freminvillei) to 3.39 (male Mustelus higmani), with r² ranging from 0.920 to 0.991. Differences in LWR due to sex were observed for three elasmobranch species. This study offers LWRs separate for males and females, also for species for which LWRs already exist and thus new knowledge is gained through the estimate presented here.     

Length–weight relationships of five fish species from the Hongshui River,China

The length–weight relationships (LWRs) of five Chinese endemic fish species caught by cast nets (mesh size 1 cm) and gillnets (mesh size 4 cm) in the Hongshui River in June and July 2011 and October to November 2012 were determined. These are the first LWRs records for the five little‐known species.     

Length–weight relationships for estuarine fishes in South Brazil

The present study reports the length‐weight relationships (LWRs) for 18 estuarine species sampled in Guaratuba Bay, South Brazil. For the majority of these 18 species the LWRs are known from the literature, but these estimates do not consider sexes separately which is done in this contribution. Different fishing gears were used in the samplings (cylindrical nets – 1 mm mesh size, bottom trawls – 250 mm mesh size in the arms and 12 mm mesh size in the bag, beach seine – 5 mm mesh size and hook and line fishery) between September 2007 to April 2014. The specimens were sexed and the LWRs were calculated for each sex separately. There were differences between sexes in growth type, showing the importance of sexing in these studies. We reported for the first time (based on FishBase) the LWRs for two species: Ctenogobius shufeldti and Hypleurochilus fissicornis.     

Length–weight and length–length relationships for 23 fish species of Porto Primavera reservoir,Upper Paraná River,Brazil

The study presents length–weight relationships (LWR) and length–length relationships (LLR) for 23 fish species captured in the Porto Primavera Reservoir, Upper Paraná River. Seventeen of the LWRs and 20 of the LLRs are reported for the first time. New maximum standard lengths are presented for 17 species as well as weights for three species and new total weight records for 19 species.     

Length‐weight relationships of five fish species from the Hongshui River,China

The length‐weight relationships (LWRs) were determined for five Chinese endemic fish species caught by electrofishing, cast nets (mesh size 1 cm) and gillnets (mesh size 4 cm) in the Hongshui River during June and July 2011 and October to November 2012. These are the first LWRs records for these five little‐known species.     

Length‐weight relationships of fishes in the Wu Jiao nature reserve and adjacent areas,China

The length‐weight relationships LWRs) (W = aL^b) of four fish species caught in 2010–2012 from the Wujiao Nature Reserve and adjacent areas are reported. LWRs of these species are documented for the first time.     

Length‐weight relationships of three freshwater fishes from Hoiya River in South Korea

The length‐weight relationships (LWRs) for three freshwater fish species in catchment area of Hoiya River, Republic of Korea, were analyzed. Fish samples were collected quarterly using scoop‐nets (5 mm mesh size), casting nets (7 mm mesh size) from 2017 to 2018. For LWRs using the general equation from Froese (2006), the parameter b ranges from 3.14 (Oryzias latipes) to 3.37 (Iksookimia longicorpa). LWRs data of these two species have not yet been listed in FishBase.     

Length–weight relationships for 35 fish species of the Atlantic Forest,SP/RJ—Brazil

Length–weight relationships (LWRs) for 35 freshwater fish species from the SP/RJ coastal basin in Brazil are presented in this paper. Fishes were captured between 2011 and 2015 on an irregular basis using electrofishing, sieves, trawl nets, cast nets and fish‐traps. In this study new LWRs are reported for 28 species, plus the total weight and length for 34 and nine species, respectively. The study provides new information on less‐studied species and can serve as a basis for management and conservation in this area.     

Length–weight and length–length relationships of eight fish species from Bohai Bay,China

Length–weight and length–length relationships (LWRs and LLRs) for eight fish species collected quarterly by trawl net in Bohai Bay, China, were estimated in a total of 1,395 specimens from 2012 to 2015. These were Pholis fangi, Setipinna taty, Engraulis japonicus, Larimichthys polyactis, Thryssa kammalensis, Scomberomorus niphonius, Johnius grypotus and Sardinella zunasi. The LWRs for the last two fish species are first reports for FishBase.     

Length‐weight relationships of 10 freshwater fishes from the Busan Metropolitan City in South Korea

The length‐weight relationships (LWRs) for 10 freshwater fish species in catchment area of Busan Metropolitan City, South Korea, were analyzed. Fish samples were collected quarterly using scoop‐nets (mesh 5 mm), casting nets (mesh 7 mm) and gill nets (mesh 20, 50 and 70 mm) from 2011 to 2016. LWRs data for seven of these species have not yet been listed in FishBase.