Length-length Relationships Research Articles

Investigation Some Biological Properties of Atlantic Mackerel Scomber scombrus Linnaeus, 1758 in the Sea of Marmara

In this study, length-frequency, length-weight and length-length relationships and condition factors of Atlantic mackerel Scomber scombrus Linnaeus, 1758 were investigated. In 2016, a total of 163 individuals were examined by random sampling from commercial fishermen in the Sea of Marmara. It was determined that the total length distribution of the samples varied between 12.0-27.0 cm. The length-weight relationships were calculated as W=0.0040L3.2975 (r2=0.978) for females, W=0.0045L3.2537 (r2=0.973) for males and W=0.0042L3.2782 (r2=0.976) for all specimens. The t-test showed that the growth pattern was positive for all sex groups and for all samples (b˃3, P<0.05). The relationship between length-length for all sex groups was also found to be quite strong (mean value: r2=0.94; P<0.05). Fulton’s condition factor (K) was calculated as 0.938±0.11 for females, 0.909±0.10 for males and 0.947±0.09 for all samples. The sex ratio (F:M) of the population was found to be 1:0.94

Length-weight and length-length relationships, sex ratio and condition factors of the Asian striped dwarf catfish Mystus tengara (Hamilton, 1822) (Siluriformes: Bagridae) in the Ganges River, Northwestern Bangladesh

The present study describes the sex ratio (SR), distribution of length-frequency (DLF), relationship of length-weight (RLW), relationship of length-length (RLL) and condition factors of Mystus tengara , a small indigenous freshwater fish species. A total of 881 specimens ranging from 4.3-11.4 cm L T (total length) and 3.8-9.6 g WB (body weight) were investigated in the Ganges River of Rajshahi, northwestern Bangladesh from January 2010 to December 2010. The overall sex ratio showed significant differences from the expected value of 1:1 (df=1, χ2=8.9, P 0.91, distribution of length-frequency). The value of Fulton’s condition factor (KF) was ranged from 0.9 to 1.2 for male and 1.0 to 1.5 for female M. tengara . Also, relative weight (WR) was significantly higher in females (WR>100) than in males (WR<100) indicating imbalance habitat with food availability.

Length-weight and length-length relationships of the European bitterling, Rhodeus amarus (Bloch, 1782) inhabiting inland waters of Samsun Province

In this study, length-weight relationships (LWRs) and length-length relationships (LLRs) for Rhodeus amarus sampled from the Terme and Terice Streams were calculated in April-November 2016. A total of 117 fish specimens (from Terme = 57, from Terice= 60) were examined. Total, fork and standard length were measured (±0.1 cm) and weighted (±0.01 g) for all captured fish. Total length varies between 4.5 and 8.9 cm, weight varies between 0.730-9.940 g for all populations. Length-weight equations were calculated as W=0.005TL3.479 and W=0.004TL3.586 for Terme and Terice, respectively. According to analyses bitterling has positive allometric growths for two localities. Length-length relationships equations show that total, fork and standard length values are very strong between each other (P&amp;lt;0.001, coefficient of determination &amp;gt;0.95).

How did dams affect length-weight and length-length relationships of Capoeta razii (Cyprinidae) in Sefid River, the southern Caspian Sea basin?

Fish populations are affected by dams in terms of morphology, reproduction, migration, growth rate and etc. To examine the hypothesis; how dams can affect the length-weight and length-length relationships in cyprinids, four Capoeta razii segregated populations (by dams) were studied. The length-weight (LWR) and length-length (LLRs) relationships were calculated for three populations from upstream, dam lakes and downstream of Manjil and Tarik dams in Sefid River, in the southern Caspian Sea basin. Also, one independent population from the damming impacts was considered as the control, to examine other possible annual effects on LWR. The b values in the LWR ranged from 2.893 to 3.586 in downstream and dam lakes populations, respectively. The r 2 value ranged from 0.966 to 0.988. The averages of recorded length and weight in dam lake population were up to two and six times (respectively) more than the ranges in up and downstream populations. Monthly LWR is presented for the control population. The sex and maturity were found as effective factors on LWR in the control population. No significant differences were observed in LWR by seasons. All LLRs were highly significant ( r 2 > 0.95). This study presents that the dams and the sex and maturity can be considered as effective non-biological and biological factors (respectively) affecting growth patterns as expressed by length and weight relationships in cyprinid ( C. razii ) populations. The results may be helpful in future fisheries studies and conservation programs.

Length-weight and length-length relationships of four Garra species from Iranian basins

This study describes the length‐weight and length‐length relationships for four species of Garra, viz., G. amirhosseini, G. gymnothorax, G. mondica and G. rosica in Iranian basins. The specimens were collected using hand net, cast net and also electrofishing in 27 different sites from different basins from November 2017 to June 2018. Significantly different b values from the expected value in length–weight relationships were observed for all the species but one. The value of the parameter b varied between 2.70 and 3.21 among the species.

Meristic, morphometric and biological characteristics of the common moray eel (Muraena helena) in northern Tunisia

AbstractAlthough common in the Mediterranean, the morphological and biological characteristics of the moray eel Muraena helena are largely unknown. This study, based on 310 specimens caught using a longline at a depth of 50–100 m, addresses this knowledge gap for northern Tunisia, which is a stronghold of the species. There were significantly more males than females, with a sex ratio of 1:1.5. The number of vertebrae between individuals were variable, especially abdominal and caudal vertebrae (range 56–72; 70–84, respectively). Overall, the total number of vertebrae was less variable (138–146 ± 3.6 SE) and similar between males and females. The length-length relationship recorded for M. helena is provided for the first time, with the pre-anal length (paL), pre-dorsal length (pdL) and the head length (hL) growing faster than the total length (TL). According to the weight-length relationship (WLR), positive allometric growth was established for males (b = 3.6), females (b = 3.46) and combined sexes (b = 3.54). The relative condition factor (CF) did not show significant differences between seasons. The gonadosomatic index (GSI) indicated a significant difference between the seasons for females, whilst the hepatosomatic index (HSI) highlighted a significant difference between seasons for both males and females.

Temporal variation of sex ratio, growth pattern and physiological status ofEutropiichthys vacha(Schilbeidae) in the Ganges River, NW Bangladesh

ABSTRACTThe present study illustrates the first complete temporal variations of sex ratio (SR), length-frequency distributions (LFDs), growth pattern based on length-weight relation (LWR), length-length relationships (LLRs) and physiological status of Eutropiichthys vacha in the Ganges River, Bangladesh. A total of 1386 specimens (male = 652, female = 734) were collected from the fishers catch during January to December, 2016. For each individual, total length (TL), fork length (FL), standard length (SL) and body weight (BW) were measured using digital slide calipers and electronic balance with 0.01 cm and 0.01 g precision. The overall SR differed statistically from the expected 1:1 ratio, although females were greater in percentage throughout the year, except in April. The TL of males and females ranged from 6.2–19.9 cm and 6.5–20.6 cm, respectively. The overall growth pattern was negative allometric for both sexes, though ANCOVA reveals significant difference in LWRs. All LLRs were highly significant wi...

Length-weight and length-length relationships of 15 algae scraper fishes of the genusCapoeta(Cyprinidae) in Iran

Length–weight and length-length parameters are presented for 15 algae scraper fishes species of the genus Capoeta from Iran. Fish specimens were collected using an electrofishing device (ELEMAX, SHX 2000) and hand-nets (mesh size 5 × 5 mm) in distinctly basins or river drainages of Iran at depths of approximately 0.2–1.2 m during 2005–2017. Significant length–weight and length-length relationships with high correlation coefficients (>0.95) were found for all species except two.

Length-weight and length-length relationships of four fish species from rivers in the Tibetan Plateau, China

Length-weight (LWRs) and length–length relationships (LLRs) were estimated for three native and one non-endemic fish species, representating three families and four genera from four sites in the Tibetan Plateau, China. Specimens were caught by a gill net (mesh size: 1-inch), cast net (mesh size 1–2 cm; depth: 1–2 m) and a traditional shrimp coop during July 2006, and from July 2013 to August 2014. The LWRs b-values of all fish species ranged from 2.63 to 3.29. All correlation coefficient values were higher than 0.95. Their LLRs were highly correlated.

Length-weight and length-length relationships of three Blenny species from the Persian Gulf and the Gulf of Oman

The present study provides the length–weight and length–length relationships information (LWR & LLR) for three Blenny species; Antennablennius adenensis from the coast of Larak Island in the Persian Gulf and Istiblennius pox and Omobranchus mekranensis, which were captured in the coasts of Chabahar city in the Gulf of Oman, Iran. Total length (TL) and standard length (SL) were determined as well as weight. Specimens were collected occasionally in summer 2017 and winter 2018 by Hand net. The length–weight parameter b for these species was 2.84, 3.29 and 3.06 respectively with a high coefficient of determination (r2 ≥ 0.95). All LLRs were highly correlated (r2 > 0.99). All three species had no previous report for LWR and LLR estimates in FishBase.

Length-weight and length-length relationships of three algae-scraping cyprinid species from Iran

The study presents length–weight relationships (LWRs) and length–length relationships (LLRs) for three algae-scraper species; Capoeta coadi from the Kouhrang River (Iran; 32°23′N, 50°08′E) a part of the Tigris drainage basin, Capoeta pyragyi from Cheshmeh Langan River (32°55′N, 50°10′E) a part of Zayanderud River basin and Capoeta umbla from Chooman River (35°57′N, 45°47′E). Fish were sampled by electro fishing (Samus1000; Power Out: 200 watts) in August, September and October 2017. Sampling was carried out each months in sites covering an area of about 100 m2 including runs, riffles and pools at a water depth of 10–60 cm. The obtained LWRs and LLRs showed a high level of correlation (r2 > 0.99).

Length-weight and length-length relationships of three ecologically important fishes caught from a wetland, northeastern Bangladesh

Length–weight relationships (LWRs) and length–length relationships (LLRs) of three ecologically important fishes (Aplocheilus panchax, Danio rerio and Esomus danrica) were reported from a wetland, northeastern Bangladesh (23 58 N, 89 38 E). Samples were collected monthly using traditional fishing gear including fine meshed (2.0 mm) push net and fine meshed (3.0–4.0 mm) surrounding net during January to December 2014. For each individual, total length (TL), fork length (FL) and standard length (SL) was measured to 0.1 cm, while body weight (BW) was measured to 0.01 g accuracy. Allometric coefficient (b) values were 3.10 for A. panchax, 3.38 for D. rerio and 3.52 for E. danrica. In addition, the LLRs were also highly significant with r2 ≥ 0.954.

&lt;b&gt;Length-weight relationship and condition factor of &lt;I&gt;Bangana dero&lt;/I&gt; (Hamilton, 1822) (Actinopterygii: Cypriniformes: Cyprinidae) from northeastern region of India&lt;/b&gt;

Assessment of length-weight relationship (LWR), length-length relationship (LLR) and condition factor was carried out for Bangana dero in northeastern India, mainly from the Brahmaputra and Irrawaddy (Manipur) River system. We report a value of ‘b’ 3.1269 and 3.1426 for LWR with respect to total length and standard length respectively, indicating positive allometric growth. The value of ‘b’ for LLR is less than one, which indicates that growth in total length is less with per unit increase in standard length. The value of ‘K’ and ‘Kn’ is 0.91 and 0.72 depicts normal well being of fish in its habitat.

Length-weight and length-length relationships for three species of Squalius (Cyprinidae; Leuciscinae) from the Caspian Sea, Namak and Tigris basins of Iran

Length-weight and length-length relationships were estimated for three species of the genus Squalius. These fish were sampled from the Caspian Sea as well as the Namak and Tigris basins of Iran. Sampling took place between July 2009 and August 2010 using a seine net (15 m long, 2 m width and 5 mm mesh size). The values of the b parameter in the length-weight relationship equations were determined as 3.37 for S. turcicus, 3.25 for S. namak and 3.14 for S. berak (b > 3).

Length-Weight and Length-Length Relationships of the Fourlined Terapon Pelates quadrilineatus (Bloch, 1790) in the North-Eastern Mediterranean Sea, Turkey

This study investigates length–weight relationships (LWR) and length–length relationships (LLRs) of three length measurements (TL, FL, SL) for the Mediterranean population of the Indo-Pasific fourlined terapon, Pelates quadrilineatus. A total of 134 specimens were collected, and LWR for females, males and both sexes, were calculated as W= 0.0037TL3.5094, W= 0.0057TL3.3378 and W= 0.0046TL3.4249 respectively. The length-length regressions were significant (P&amp;lt;0.001) for all species, with all r2 values greater than 0.930.

Length-weight, Condition factor and gonadosomatic index of blackspot snapper Lutjanus fulviflamma (Forsskal, 1775) (Perciformes: Lutjanidae) in the northern Persian Gulf

The present study aimed to evaluate the length-weight and Length-length relationships as well as the condition factor and gonadosomatic index of the Blackspot snapper, Lutjanus fulviflamma in the northern Persian Gulf, Hormozgan Province, Iran. The specimens were collected monthly from April 2016 to March 2017. The size (TL, total length; FL, fork length; SL, standard length) were measured and weighted (BW, total body wet weight). A total of 446 individuals were analyzed. The TL-BW relationship indicated isometric growth pattern in both sexes. In females, the means for condition factor was higher than males. In both sexes, the lowest value of both condition factor and gonadosomatic index were detected in autumn with ascending trend in the next seasons reaching the peak in spring. The oscillation in condition factor, as well as gonadosomatic throughout the sampling year, was most prominent in females which may be related to the reproductive cycle. The information reinforces data to define fishing closed seasons in this important fish that is used in many places in the world.

Length-weight and length-length relationships of eight fish species from river Ganga, India

Length-weight and length-length relationships of eight fish species from river Ganga, India

Length-weight and length-length relationships for two gobiids from the Anzali Wetland, in the southern Caspian Sea basin

Length–weight (LWR) and length–length (LLR) relationships were estimated for specimens of two gobiid species collected from the Anzali Wetland and its related streams in the southern Caspian Sea basin, in August 2017. These represent the first reports of LWR and LLR data for Rhinogobius cf. similis Gill, 1859 (37°28′13″N, 49°20′33″E; 50 individuals) and Proterorhinus nasalis (De Filippi, 1863) (36°54′10.89″N, 53°48′48.33″E; 30 individuals) from the Wetland. A new maximum length is reported for P. nasalis. The length–weight parameter b for these species ranged a minimum of 2.99 for Rhinogobius cf. similis to a maximum of 3.04 for P. nasalis with regression coefficients (r2) ranging from .95 to .97. All LLRs were highly significant (r2>.96).

Length-weight and length-length relationship of two endemic snakehead fish species from Brahmaputra river basin, Assam, India

Length–weight relationships (LWRs) and length–length relationships (LLRs) of two endemic Channid fish species, Channa aurantimaculata Musikasinthorn, 2000 and C. stewartii (Playfair, 1867) were studied from Brahmaputra River basin in Assam, India. Sampling was done from May to December, 2017 and a total of 81 fish specimens were collected using bamboo traps. In the LWRs, b value for C. aurantimaculata and C. stewartii were 3.0456 and 2.9172 respectively. Maximum size recorded for C. aurantimaculata in the present study (34.1 cm) was higher than previous record in FishBase (19.1 cm).

English

Morphometric relationships of African big barb, Labeobarbus intermedius (Ruppell, 1836) (Pisces: Cyprinidae) in Lake Koka, Ethiopia was studied based on the total number of 266 adult fish samples collected in April-May and July-August 2011. Fish ranging from 23.3 to 49.0 cm in total length (35±4.1 cm) and from 95.4 to 1200 g in total weight (434.4±206.5 g) were randomly sampled. Of these, 55.6% (n=148) were males and 44.4% (n=118) were females. The length-weight relationship of the males, females and combined fish were curvilinear and statistically significant (P 0.01). Length-length relationships between total length (TL) and fork length (FL), fork length (FL) and standard length (SL), TL and SL were linear and statistically significant (P 0.01). The overall condition factor for all sampling period was 1.0. Key words: Allometric growth, Labeobarbus intermedius, condition factor, Lake Koka, length-weight relationship.