Length–weight relationships for 24 fish species in a coastal lagoon of the Mexican South Pacific

Length–weight relationships were estimated for 24 species belonging to 16 families of fishes, representing a total of 15 312 measured fish, from the Carretas-Pereyra lagoon, Chiapas, Mexico. Significant length–weight relationships were found for all species. For 13 species, length–weight relationships are published for the first time.     

Length–weight relationships of fish species caught in the Upper Uruguay River, Brazil

Length–weight relationships were estimated for 56 species, representing seven orders and 17 families of fishes from the Upper Uruguay River, Brazil. For most of these species, no length–weight relationships were previously available.     

Length–weight relationships for 20 species collected in the Jurumirim reservoir (Paranapanema Basin, Brazil)

Length–weight relationships were estimated for 20 species of the Jurumirim reservoir (southern Brazil): one Pimelodidae, one Callichthyidae, six Characidae, one Prochilodontidae, six Anastomidae, one Erythrinidae, two Curimatidae, one Paradontidae and one Cichlidae. The fishes were collected during 2001–2002 using three different types of fishing gear that allowed collection of both adult and juvenile specimens. The first reference of length–weight relationships for 12 species is provided.     

Length–weight relationships for 36 fish populations from a disturbed tropical estuary in northern Colombia

The study reports length–weight relationships for 36 species belonging to 20 families of the estuarine zone of the Sinú River in northern Colombia. To the best knowledge of the authors, this study presents the first study on length–weight relationships for 10 species worldwide as well as seven new maximum lengths.     

Length–weight relationships of eight fish species from the lower section of the Uruguay River (Río Negro, Uruguay)

This study reports length–weight relationships for Apareiodon affinis , Leporinus obtusidens , Cynopotamus argenteus , Loricariichthys melanocheilus , Parapimelodus valenciennis , Iheringichthys labrosus , Rhinodoras dorbignyi and Pachyurus bonariensis . Specimens were collected between 2006 and 2007 from the lower section of the Uruguay River. The study represents the first reference on weight–length relationships for three species and also provides the new maximum size for three species.     

Length–weight relationships of 21 fish species from the lower section of the Santa Lucía river basin (Canelones-Montevideo, Uruguay)

This study provides new length–weight relationship information for 21 neotropical fish species. Specimens were collected between 2004 and 2005 from the lower section of the Santa Lucía river basin (Uruguay). Presented are also the first reference on weight–length relationships for these 21 species, and new maximum sizes for six of these species.     

Length–weight and length–length relationships of fish species from the Aegean Sea (Greece)

We present the relationships between total (TL), fork (FL) and standard (SL) length for 37 fish species and the relationships between TL and wet weight for 40 fish species from the Aegean Sea (Cyclades; Greece). The relationships between TL, FL and SL were all linear (for all cases: r ² > 0.928). The values of the exponent b of the length–weight relationships ranged from 2.235 to 3.704.     

Length-weight relationship of deep-sea demersal finfishes from the Southeastern Arabian Sea

This paper reports the results of pioneer study carried on the length-weight relationships (LWRs) of six deep-sea fishes of the Southeastern Arabian Sea. We have collected samples from the survey cruise of FORV Sagar Sampada during January and December 2014. A high-speed demersal trawler was used to collect the fishes from the depth ranging from 200 to 1000 m. The values for the parameter b of the length-weight relationship were estimated together with Coefficient of determination scores. This study provides valuable contributions to the estimates of length–weight relationships of the deep-sea fishes of Southeastern Arabian Sea.     

Length–weight relationships for 12 fish species caught in Seyhan Dam Lake in southern Anatolia, Adana, Turkey

Presented are the length–weight relationships of 12 fish species [ Oncorhynchus mykiss (Walbaum, 1792); Cyprinus carpio, Linnaeus, 1758; Carassius carassius Linnaeus, 1758; Alburnoides bipunctatus (Bloch, 1782); Alburnus adanensis Battalgazi, 1944; Rutilus rutilus , Linnaeus, 1758; Squalis cephalus, Linnaeus, 1758; Tinca tinca (Linnaeus, 1758); Capoeta barroisi (Valenciennes, 1842); Silurus glanis Linnaeus, 1758; Gambussia affinis (Baird and Girard, 1853); and Sander lucioperca (Linnaeus, 1758)] from Seyhan Dam Lake, Turkey. This study provides the first estimation of length–weight relationships for two of the species ( A.   adanensis and C. barroisi ).     

Length–weight relationships and condition factor of the Japanese silver-biddy, Gerres equulus, in the Yatsushiro Sea, western Kyushu, Japan

The Japanese silver-biddy Gerres equulus (Temminck and Schlegel) is one of the most common shore fishes in the costal waters of southern Japan and commercially important for the local fishery. In this study the condition factor, length–weight (LWR) and length–length relationships (LLR) of G. equulus are described for the first time. A total of 1121 specimens (511 males; 620 females) were collected using gill nets in the Yatsushiro Sea, western Kyushu, Japan. The overall allometric coefficient b of LWR was close to the isometric values ( b  =   3.088). Fulton's condition factor showed high values at the beginning of the spawning season (June–September) and peaking 2 months after the spawning season.     

Length–weight relationships for coastal fish species from the gillnet artisanal fishery in the central Mexican Pacific

This paper presents 43 length–weight relationships of coastal fish species of the families Carangidae, Lutjanidae and Haemulidae from the central Mexican Pacific. New maximum length values for 15 fish sepcies are included.     

Length–weight relationships and seasonality in reproduction of six commercially utilized fish species in the coastal lagoon of Tres Palos (Mexico)

The length–weight relationship parameters and seasonal reproductive cycle are recorded for six commercially important fish species caught in the coastal lagoon of Tres Palos. The length–weight information is new to the literature for three of these species (spot cichlid, spotted sleeper, Pacific fat sleeper) and is within the expected range for the other three (widehead sea catfish, three spot cichlid, white mullet). Differences between sexes are statistically significant for four species and deviations from isometric growth are indicated in three species. The reproductive period for the Pacific fat sleeper differed substantially from the period reported for this species in Ecuadorian waters.     

Length–weight relationships of 17 less-studied fish species from Çanakkale, Marmara region of Turkey

This study reports length–weight relationships for 17 cryptic and rare species, Aidablennius sphynx , Arnoglossus kessleri , Callionymus pusillus , Callionymus risso , Clinitrachus argentatus , Echiichthys vipera , Gobius geniporus , Gobius paganellus , Labrus viridis , Lepadogaster lepadogaster , Ophidion barbatum , Pomatoschistus minutus , Pomatoschistus pictus , Salaria pavo , Tripterygion delaisi , Tripterygion tripteronotus and Zebrus zebrus from Çanakkale near shores in the Marmara region of Turkey.     

Length–weight relationships of eight freshwater planktonic crustacean species in Japan

1. The relationships between body length and dry weight were examined for eight species of freshwater planktonic crustacea common in Japan: Eodiaptomus japonicus, Acanthodiaptomus pacificus, Daphnia galeata, D. similis, D. magna, Scapholeberis mucronata, Simocephalus exspinosus and Bosmina longirostris.
2. The relationships of two diaptomid species were similar and the approximate equation was ln W = 2.7 + 2.6*ln L , where L is prosome length (mm) and W is dry weight (μg). The carapace length–dry weight relationships in branchiopods were more variable, with the slope ranging from 1.9 to 2.9 and the intercept from 2.0 to 3.7.
3. The effects of food conditions on the relationship were examined in the laboratory, and the seasonal changes in the field were also studied.
4. Practical advice is presented for predicting crustacean weight from body length.     

Length–weight relationship of clown knifefish Chitala chitala (Hamilton 1822) from the River Ganga basin, India

This study describes the length–weight relationship (LWR) of the clown knifefish, Chitala chitala, in the River Ganga basin, India. A total of 221 specimens ranging from 31 to 120 cm total length (TL) and 550 to 12 000 g total weight (TW) were collected. Chitala chitala constitutes an important component of riverine fisheries of India and is considered one of the most commercially important and highly priced foods in addition to being an aquarium fish. The species has recently undergone heavy fishing pressure, leading to an alarming decline in natural populations and deserving of high conservation importance. Length–weight relationships of C. chitala from wild populations had not yet been studied. Hence, the study objective was to evaluate length–weight relations of C. chitala from eleven populations in order to help in conservation and management of the riverine population.     

Length–weight and length–length relationships of 10 small fish species from the Ganges, Bangladesh

This study describes the length–weight (LWR) and length–length (LLR) relationships for ten small indigenous fish species from the lower part of the Ganges, Bangladesh, namely Ailia coila , Amblypharyngodon mola , Aspidoparia morar , Clupisoma atherinoides , Eutropiichthyes vacha , Glossogobius giuris , Gudusia chapra , Lepidocephalus guntea , Mystus vittatus , and Puntius ticto . A total of 2142 specimens, representing 10 species of 5 families used for this study were caught by traditional fishing gear from March 2006 to February 2007. Standard length (SL), total length (TL) and fork length (FL) for each specimen were measured by digital slide calipers and each body weight (BW) was taken by a digital balance. The allometric coefficient b of the LWR was close to the isometric value ( b  =   3.001) in G. giuris , although it suggested negative allometric growth in A. coila, A. morar, C. atherinoides, E. vacha, and P. ticto, whilst positive allometric growth in rest of the species. The results further indicated that the LLRs were highly correlated ( r ²  >   0.890; P < 0.01). To the best our knowledge, this study presented the first reference on LWR and LLR for most of the species in Bangladesh.     

Length–weight relationships for Brazilian estuarine fishes along a latitudinal gradient

Ninety-nine length–weight relationships (LWR) were estimated for 70 bentho-demersal fish species captured in four Brazilian estuaries between latitudes 0°S and 25°S. LWR are published for the first time for 13 species. The allometry coefficient ( b ) of the LWR ( W = aTL ^b ) showed a median of 3.147. Positive allometry was dominant (64 of the 99 species x estuary cases), followed by isometry (28) and negative allometry (7). Twenty-two species were caught in two or more estuaries. In most cases (29 of 33 comparisons), the values of both regression parameters differed significantly among estuaries.     

Length–weight relationships of 26 fish species from the middle section of the Negro River (Tacuarembó‐Durazno,Uruguay)

This study provides data on the length–weight relationship (LWR) for 26 species of neotropical fishes. Specimens were collected between 2008 and 2009 from a dam‐enclosed section of the middle Negro River (Uruguay). This study represents the first reference on length–weight relationships for 17 species, and also provides new maximum sizes for eight species.     

Length–weight and length–length relationships of three endemic butterflyfish species (Chaetodontidae) from coral reefs of the Northwestern Hawaiian Islands, USA

Length–weight and length–length relationships are presented for three species of butterflyfish endemic to the Hawaiian Islands and Johnston Atoll. From specimens collected within the Papahānaumokuākea Marine National Monument (PMNM), the weight–length relationships were determined for Chaetodon fremblii as W  = 0.029SL^3.17, Chaetodon miliaris as W  = 0.042 SL^3.00, and Chaetodon multicinctus as W  = 0.029SL^3.19 where weight, W , is reported in grams and standard length, SL, in centimeters. Length-frequency data and equations to calculate total length from standard length are also presented.     

Empirical relationships to estimate asymptotic length, length at first maturity and length at maximum yield per recruit in fishes, with a simple method to evaluate length frequency data

Empirical relationships are presented to estimate in fishes, asymptotic length (L∞) from maximum observed length (L_max), length at first maturity (L_m) from L_∞, life span (t_max) from age at first maturity (t_m), and length at maximum possible yield per recruit (L_opt) from L_∞ and from L_m, respectively. The age at L_opt is found to be a good indicator of generation time in fishes. A spreadsheet containing the various equations can be downloaded from the Internet at http://www.fishbase.org/download as popdynJFB.zip. A simple method is presented for evaluation of length–frequency data in their relationship to L_∞, L_m and L_opt. This can be used to evaluate the quality of the length–frequency sample and the status of the population. Three examples demonstrate the usefulness of this method. 2000 The Fisheries Society of the British Isles