Relative Condition Factor Research Articles

LENGTH-WEIGHT RELATIONSHIP AND CONDITION FACTOR OF THE WHITEMOUTH CROAKER Micropogonias furnieri (ACTINOPTERYGII, SCIAENIDAE) CAPTURED IN THE NORTHEAST OF BRAZIL

Length-weight relationships (LWRs) and relative condition factor are of great importance in fishery assessment studies since it providesinformation about the growth of the fish, its general wellbeing, and fitness in a marine habitat. This study estimated length-weight relationship and condition factor for whitemouth croaker Micropogonias furnieri captured in Pirambu-SE, northeast from Brazil. A total of 1333 specimens were analyzed, from March 2019 to March 2020. Whitemouth croaker showed negative allometric growth resulting in β1: 2.7697. The condition factor varied between months, such as September and between January and February, demonstrating a possible partial spawning

Length–weight relationships and condition factors of five fish species from the coastal region of West Bengal, India

AbstractThe present study presents the length–weight relationships of five brackish water fish species from the coastal region of West Bengal for which this relationship not known to the present time, including Stigmatogobius sadanundio, Brachygobius nunus, Microphis cuncalus, Butis melanostigma and Puntius vittatus. The slope (b) value of the regression ranges between 2.551 and 3.319, with high correlation values (r2 ≥ .943). The relative condition factor (Kn) was also calculated, being >1.0 for all species examined in the present study, indicating of the overall condition of the fish species.

Length and Weight Relationship, Condition Factor, and Morphometric Characteristics of Eleven Freshwater Fish Species in Koto Panjang Reservoir, Indonesia

This study analyzes the species composition, length–weight relationship (LWR), condition factor, and morphometric and meristic characteristics of eleven freshwater fish species in Kota Panjang Reservoir, Indonesia. Fresh specimens were collected from September 2023 to February 2024. Results show that among the sampled species, two belong to Order Anabantiformes, three to Order Siluriformes, and six to Order Cypriniformes. The Order Siluriformes has the lowest species composition, with Hemibagrus wyckii at 3.09%, while the Order Cypriniformes has the highest, with Barbonymus schwanefeldii at 15.25%. The LWR coefficient b ranges from 1.693 to 3.151. Of the species studied, only Hemisilurus heterorhynchus (b = 2.174), Clarias teijsmanni (b = 2.046), Anabas testudineus (b = 2.375), Labiobarbus festivus (b = 2.305), and Rasbora argyrotaenia (b = 1.693) fall outside the expected range of 2.5 < b less than < 3.5. One species exhibits a positive allometric growth (+), seven show a negative allometric growth (−), and three display an isometric growth (I). Fulton’s condition factor (Kc) averages between 0.73 ± 0.15 and 4.96 ± 0.63, indicating morphological variation. The allometric condition factor (Ka) ranges from 0.87 ± 0.18 to 26.25 ± 4.05, reflecting differences in resource availability and competition. Relative condition factor (Kn) values range from 1.00 ± 0.09 to 2.51 ± 0.55, indicating good growth. Morphometric analysis shows that Rasbora argyrotaenia has the smallest average total length, head length, and body depth, while Hemibagrus wyckii has the largest. The results provide new data on the LWR, condition factor, and morphometric characteristics of eleven selected freshwater fish species in Kota Panjang Reservoir, Indonesia, and offer up‐to‐date information on the remaining species in the study area. These findings could have a significant impact on species stock assessments and help identify priority species for domestication.

Carapace Length–Weight, Carapace Width–Weight Relationships and Relative Condition Factor of Four Portunid Crab Species of the Gulf of Mannar, Southeast Coast of India

Carapace Length–Weight, Carapace Width–Weight Relationships and Relative Condition Factor of Four Portunid Crab Species of the Gulf of Mannar, Southeast Coast of India

An ichthyofaunal amendment with the length-weight relations and condition factors of some endemic and invasive freshwater fishes from Western Anatolia

In the scope of this study, fish fauna of Küçük Menderes River and its tributaries, updated with the comparison of the recent ichthyofaunal studies, as well as the length-weight relations (LWR) and condition factors (CF) were estimated for 7 freshwater fish species belonging to six families from the river basin: endemic Oxynoemacheilus eliasi, Cobitis fahireae; invasive, Carassius gibelio, Atherina boyeri, transloce Perca fluviatilis and the native Squalius fellowesii, Cyprinus carpio. The fish samples were collected with various fishnets and DC electro-fishing devices from six stations in 2018 and 2019. The LWR of the fishes was studied based on 379 specimens. The estimated values of parameter b ranged from 2.884 (A. boyeri) to 3.176 (C. fahireae). The coefficient of determination (R2) was changed between 0.792 to 0.980 for all sampling localities. In the study, Fulton’s condition factor ranged between 0.391 (S. fellowesii) to 3.080 (S. fellowesii); the relative condition factor ranged between 0.346 (O. eliasi) to 2.746 (S. fellowesii), respectively. This research is anticipated to contribute valuable insights for the conservation of the species, while also furnishing essential data to inform future fisheries management studies in the region.

ASPEK BIOLOGI DAN HABITAT IKAN LURAI (Corica soborna Hamilton, 1822) DARI HILIR SUNGAI MAHAKAM, KALIMANTAN TIMUR [Biological Aspects and Habitat of Lurai Fish (Corica soborna Hamilton, 1822) from the Lower Mahakam River, East Kalimantan

The Lurai fish, scientifically known as Corica soborna Hamilton, 1882, belongs to the small freshwater fish in the Clupeidae family of the Clupeiformes order. Local communities in the lower Mahakam River, East Kalimantan, have long exploited this species for consumption and trade. At the same time, the biological information regarding this fish, which forms the fundamental basis for its conservation, is yet unknown. This study aimed to analyze the biological aspects and habitat of the lurai fish in the lower Mahakam River. A total of 812 fish samples were analyzed using measuring and weighing methods. The results showed that the fish's length ranged from 42.48 to 63.89 mm and their weight from 0.70 to 2.56 g. Mature lurai fish with 52.48-54.47 mm length dominated the highest mode. The regression model of the length-weight relationship was W= 5×10-6L3.18 for the total sample. The growth pattern of the fish was isometric, and the relative condition factor ranged from 0.765 to 1.123. The sex ratio was 1 male : 1.68 females. The highest percentage of gonadally mature fish was found in February. Fish lengths at first gonad maturity ranged from 52.55 to 53.38 mm for males and 59.94 to 61.25 mm for females. The habitat of the lurai fish is at the edge of the river with vegetation, a muddy bottom, a dissolved Oxygen range of 3.70-4.17 mgL-1, a temperature range of 27.50-28.40 °C, a TDS range of 50-80 mgL-1, a clarity range of 19-29 cm, a water depth range of 2.80-3.60 m, and a current velocity range of 0.65-1.07 mst-1.

Length-weight Relationship and Condition Factor of Siluriformes Fish Species, Endangered Eutropiichthys vacha, Hamilton (1922) and Endemic Deccan Catfish Rita kuturnee (Sykes, 1839) of Godavari River Andhra Pradesh, South India

Background: The present study of the length-weight relationship and condition factors of two Eutropiichthys vacha and Rita kuturnee, from Godavari River Andhra Pradesh, from the year August 2021 to July 2023 at fortnightly intervals. Methods: The log transformation formula was employed to establish length-weight relationships (LWRs) [3]. The length-weight equation used was W = aLb, in the usual notations. Linear regression of the log-transformed equation, log(W) = log(a) + b log(L), was utilized to calculate the parameters ‘a’ (intercept) and ‘b’ (slope) of the relationship. Result: A total of 1453 specimens of E. vacha and 1273 specimens of R. kuturnee were collected by using gill nets. The collected specimens exhibited a total length range of 10 to 27 cm for E. vacha and 7 to 18.5 cm for R. kuturnee. Correspondingly, the body weight range was recorded as 12 to 140 gm for E. vacha and 8 to 50 gm for R. kuturnee. Statistical analysis revealed a negative allometric growth trend for both males and females of E. vacha and R. kuturnee, with b values ranging from 2.569 to 2.711 for E. vacha and 2.53 to 2.61 for R. kuturnee. The fluctuation in the relative condition factor ranged from 1.06 to 1.09 for E. vacha and 1.001 to 1.12 for R. kuturnee. Furthermore, the overall health conditions of these two species were determined to be favorable.

Length-weight relationships and condition factors of three freshwater fish species – Bangana dero (Ham.), Cyprinus carpio L., and Sperata seenghala (Sykes) – from the Sutlej River, India

Abstract Waterbodies are polluted by human activities or the increasing intensity of these activities, and this affects fish populations. The quality of the water fish inhabit directly impacts their growth and overall health. Length-weight relationships (LWRs) and relative condition factors (Kn) were estimated for three freshwater fish species from the Sutlej River of India from October 2020 to May 2022. A total of 232 fish specimens were caught with cast and gill nets in Gobindsagar Reservoir, Himachal Pradesh and Ropar Wetland, Punjab. Total length was strongly correlated with all the morphological characters (p < 0.001). The growth coefficients calculated (b) for Bangana dero, Cyprinus carpio, and Sperata seenghala were 2.858, 2.506, and 2.555, respectively, and indicated negative allometric growth. The correlation coefficients (r) indicated strong linear relationships between the weights and lengths of all three fish species. The outcomes of this study will help fisheries researchers, environmentalists, and scientists to develop future monitoring and conservation strategies for these fish species.

Body condition as a descriptor of American alligator (Alligator mississippiensis) health status in the Greater Everglades, Florida, United States.

Body condition is used as an indicator of the degree of body fat in an animal but evidence of its actual relationship with health diagnostics (e.g., blood parameters) is usually lacking across species. In American alligators (Alligator mississippiensis), body condition has been used as a performance metric within the Greater Everglades ecosystem to provide insight on hydrological and landscape changes on alligator populations. However, there is no clear evidence that spatial body condition changes relate to different health conditions (low food intake vs sickness) and whether this link can be made when relating body condition values with blood parameters. We assessed the relationship between alligator body condition and 36 hematological and biochemistry (blood) parameters in four areas across two physiographic regions (Everglades and Big Cypress) of the Greater Everglades (sample size = 120). We found very strong to weak evidence of linearity between 7 (Big Cypress) and 19 (Everglades) blood parameters and relative condition factor index, from which cholesterol (38%) and uric acid (41%) for the former and phosphorus (up to 52%) and cholesterol (up to 45%) for the latter (mean absolute error MAE = 0.18 each) were the predictors that individually explain most of the body condition variation. The best combination of blood parameters for the Everglades were cholesterol, phosphorus, osmolality, total protein, albumin, alpha 2, beta, and gamma globulins, and corticosterone accounting for 40% (37 ± 21%, MAE = 0.16) of the variation found in alligator body condition for this region. We found better predictability power in models when analyzed at smaller rather than larger scales showing a potential habitat effect on the body condition-blood parameters relationship. Overall, Everglades alligators in poorer condition are likely dehydrated or have an inadequate diet and the spatial differences found between physiographic regions suggest that these areas differ in prey availability/quality.

Exploring the morphological dynamics of Nile tilapia (Oreochromis niloticus Linn. 1758) in Victoria Nile as depicted from geometric morphometrics

BackgroundVarious anthropogenic activities continue to threaten the fish biodiversity of the East African water bodies such as the Victoria Nile. Although the Victoria Nile is a significant source of livelihood for human populations, the biology and ecology of Nile tilapia in this ecosystem remain understudied with little or no information on the morphology of the fish given varying and immense anthropogenic activities. Here, we use geometric morphometrics to examine the morphology/shape variations of Nile tilapia populations in Victoria Nile to gain insights into their current ecological state.ResultsOur results indicate unexpectedly smaller Nile tilapia body weights in Victoria Nile than in L. Victoria. Despite this, nearly all the populations displayed a relative condition factor (Kn) of greater ≥1 suggesting a healthy stock. However, two populations, LMF and VN_Bukeeka demonstrated Kn values of less than one (< 1). We also report that some Upper and Lower Victoria Nile populations display morphological similarities. Apart from L. Albert, Nile tilapia populations from Lakes Victoria and Kyoga are morphologically divergent from the riverine ones. We note that Nile tilapia from Nalubale Dam Reservoir is morphologically distinct from the close neighbouring Victoria Nile populations which are likely allied to the influence of the Nalubale Hydroelectric power dam as a barrier.ConclusionNile tilapia’s morphological variation appears to be influenced by various anthropogenic disturbances notably, overfishing, hydroelectric power dams, and fish translocational history in Uganda. Management should enforce regulatory frameworks to avert human-mediated activities as these are likely to compromise the sustainability of the fisheries. Further studies are required to follow these populations with molecular genetics and environmental data to gain a deeper understanding of the fish species for informed sustainable management and conservation options.

Understanding Relationship between Length and Weight with Otolith Dimension of &lt;i&gt;Tenualosa ilisha&lt;/i&gt; from Hooghly River (India)&lt;sup&gt;1&lt;/sup&gt;

The Indian hilsa shad, Tenualosa ilisha (Hamilton, 1822), is a highly valued fish of the Indo Pacific region. This paper represents the length-weight relationships (LWR), condition factor (K), relative condition factor (Kn), and otolith dimension of hilsa, throughout the Hooghly River (West Bengal) from January to December 2020. The value of exponent “b” in the equation W = cLb was 2.6 for the species. It suggests the growth rate almost follows the cube law. Most of the population under study complied with the ideal b-value. Regression analysis indicated a high positive correlation between length and weight in the species (R2 = 0.76). The Kn shows their general well-being to be good in the river. The relationships between total fish weight and otolith biometry parameters such as long arm (L.A) length, short arm (S.A) length, L.A/S.A, and diameter (D) were examined. Linear regressions have represented fish weight-otolith biometry relationships. Regression analysis indicated a strong positive relationship between body weight and otolith length (R2 = 0.848), otolith diameter (R2 = 0.803), and short arm length of otolith (R2 = 0.678), but no relationship was found between L.A/S.A of otolith and fish weight. This strong relationship between fish weight and otolith length and diameter of T. ilisha, reflects that otolith length and diameter could become the best predictor of fish weight.

Sexual dimorphism, length-weight relationship, and condition factor of Hampala ampalong (Bleeker, 1852) from Kalong Floodplain, Ogan Komering Ilir Regency

Sumatra hampala or kebarau fish, Hampala ampalong (Bleeker, 1852) is one of the fish species found in Kalong Floodplain in the Ogan Komering Ilir Regency, South Sumatra, Indonesia. This study aimed to determine sexual dimorphism, length-weight relationship and condition factor of H. ampalong. The study method used was direct observation with purposive sampling technique. The total fish obtained consisted of 12 male and 12 female. The results showed that almost all morphometric characters of female were longer than male except for head length which determined that male longer than female. The head length of male was 2.28 ± 1.04 while the head length of female was 2.27 ± 0.85 it could be assumed that the sexual dimorphism seen from the difference in head length. While the meristic characteristics there was no difference between male and female; dorsal fin spine and rays (I. 7-8), ventral fin rays (6-8), pectoral fin rays (13), anal fin rays (6-9) and caudal fin rays (18). The length-weight relationship of male obtained a linear regression equation y = 0.0092x3.0418 with R2 = 89.45%, the value of b obtained was 3.0418 which means that the growth pattern of male was isometric (b=3), while the linear model regression equation of female fish y = 0.0238x2.6975 with R2 = 76.74%, the value of b obtained was 2.6975 which indicates that the growth pattern of female includes negative allometric (b&lt;3). The value of the relative condition factor of male and female were K&gt;1 which means the value of fish condition were in good.

LENGTH-WEIGHT RELATIONSHIP OF EIGHT SPECIES OF FISH CAUGHT BY TRADITIONAL PAPUAN FISHERS IN YOUTEFA BAY, INDONESIA

In this study, data on length and weight of fish were used to determine the length-weight relationship and condition factors of eight fish species that are targeted by traditional Papuan fishers and have high economic value (Lutjanus fulvus, Gerres oyena, Parupeneus barberinus, Siganus spinus, Siganus canaliculatus, Pelates quadrilineatus. Mugil cephalus, and Hemiramphus far) in Youtefa Bay, Papua Province, Indonesia. A total of 245 fish specimens were collected from Papuan fishermen during the period January to March 2020. The total length and body-weight of the fish specimens studied ranged from 15.2 to 32.1 cm (average 20.26±3.73 cm) and 42.72 to 371.86 g (average 124.10±52.45 g), respectively. The b value ​​for all fish species studied ranged from 2.6919 to 3.0791, with the coefficient of determination (R2) ranging from 0.9022 to 0.9947. The growth patterns of the eight fish species were allometric (b ≠ 3; t-test &lt; t-tab), where L. fulvus (2.824), P. barberinus (2.9136), S. canaliculatus (2.989), P. quadrilineatus (2.9577), M. cephalus (2.9096), and H. far (2.6919) were negative allometric (b &lt; 3), while G. oyena (3.0596) and S. spinus (3.0791) are positive allometric (b &gt; 3). Meanwhile, the relative condition factor and Fulton condition factor values ​​ranged from 0.874 to 1.201 (average 0.999±0.321) and 0.204 to 2.726 (average 1.612±0.515). M. cephalus had a higher relative condition factor, while L. fulvus had a higher Fulton condition factor than other fish species

Length-Weight Relationships and Relative Condition Factor of 53 Species of Shallow-Water Fish in the Colombian Caribbean Sea

Length-weight relationships (LWR) were described for 53 species of shallow-water fish caught with bottom trawls in a depth range between 7.3 and 108.1 m during September 2013 in the Colombian Caribbean Sea (fishing area 31 of the FAO). A linear regression was performed using the logarithmically transformed data to calculate a and b coefficients and their 95% confidence interval of the LWR for 53 fish species corresponding to 28 families and 44 genera. Six fish species showed a maximum total length greater than that reported in FishBase: Astrapogon alutus (102.00 mm), Eucinostomus harengulus (162.00 mm), Haemulopsis corvinaeformis (293.00 mm), Cyclopsetta chittendeni (390.00 mm), Etropus crossotus (224.00 mm), and Bairdiella ronchus (415.00 mm). A total of 24 species (45.3%) exhibited isometric growth, 21 species (39.6%) negative allometric, and 8 species (15.1%) positive allometric. This study shows the first estimates of LWR for 25 species of shallow-water fish in the Colombian Caribbean Sea. We found interdependence of growth parameters as a function of fish body shape. The analysis of the relative condition factor indicated that 21 fish species (39.6%) showed poor growth conditions. The results obtained from this study contribute to fill information gaps on shallow-water fish populations and also help fisheries scientists in future population assessment studies in the Colombian Caribbean Sea.

Seasonal Variations in Condition Factor, Food and Feeding Habit of &lt;i&gt;Labeo bata&lt;/i&gt; (hamilton) in Kulia Beel, West Bengal

Labeo bata constitute an important fishery in beels of West Bengal. An attempt was made to study seasonal variations in condition factor as well as food and feeding habit of this fish during pre-monsoon, monsoon and post-monsoon periods (March to November, 2001) in Kulia beel of West Bengal. The relative condition factor varied from 0.907 to 1.076 with higher values during pre-monsoon period. The feeding intensity was found maximum during post-monsoon period. A wide variation was observed in food spectrum of the fish. It fluctuated both season wise as well as with size of the fishes. The details of such variations are discussed.

Biology of Length-weight and Feeding in Juveniles and Adults of Air-breathing Perch &lt;i&gt;Anabas testudineus&lt;/i&gt; (BLOCH)

The biology of feeding and growth pertaining to seasonal variations in diet composition, length-weight relationship and condition factor of Anabas testudineus was studied for a period of one year in two size group fishes (Group I: juveniles of &lt;100 mm and Group II: adults of &gt;100 mm). The length-weight relationship of the fish for Group I was W=0.00849 L3.2168 and for Group II was W=0.00877 L3.1502. The relative condition factor fluctuated from 1.032 to 1.372 indicating a significant variation (p &lt; 0.05) in two size groups. The feeding intensity was maximum during October to December. Diet composition indicated the highest occurrence of insects followed by crustaceans and decayed organic matter. It also showed variations in different size group of fishes.

Düden Çayı'ndaki (Antalya, Türkiye) Endemik ve Tanıtılan Cyprinid Balıklarının Vücut Kondisyonu ve Büyüme Tiplerinin Mekansal Değişimi

In this study, we evaluated the parameters of the length-weight relationship and the relative condition factor of endemic Pseudophoxinus antalyae and introduced fish species, Carassius gibelio and Cyprinus carpio in the Kırkgöz Spring-Duden Stream basin. A total of 269 fish were captured from three different sites of the basin from May to September 2022. There were differences in mean length and weight were observed between populations from sites 1 to 3 for three fish species. Negative allometric growth was observed in site 2 population of P. antalyae, whilst site 1 and 3 showed positive allometric growth, and the condition factor (K) for only site 1 was above 1. The populations of C. carpio from sites 2 and 3 showed positive allometric growth, while C. giebelio was negative allometry. K &gt;1 for C. carpio at site 3 and for C. gibelio at site 2. This study can inform both fisheries biology and environmental management for the development and conservation of endemic fish stock.

First record of important biological parameters of Badis badis: A small indigenous species in Bangladesh

A total of 286 Badis badis were collected from the Sutiyahali Reservoir in Mymensingh from January to December 2022, and their sex ratios, first sexual maturity, length-weight relationships and condition factors were evaluated. The weight and length of B. badis varied from 0.81 to 1.01g (0.89±0.30) and 4.08 to 4.60cm (4.36±0.31), respectively. Logistic curves depicting a sex ratio and 50% maturity (L50) estimated at 4.5cm for females and 4.05cm for males, as well as males reaching first sexual maturity with a shorter length than females. Regression coefficients in every month differ significantly (p&lt;0.05), according to the regression equations. Each month, the values of the exponent b were less than 3 (b&lt;3), with the highest value of b recorded in August (2.80) and the lowest value recorded in January (2.33). This led to a monthly negative allometric growth being seen. A strong positive relationship is evident from the coefficient of determination (r2) values, which ranged from 0.92-0.98 with an average of 0.961. During the study, the average condition factor (Kn) value for B. badis was found to be 1.02±0.13, which is a positive indicator of the fish's physical well-being. The condition factor values varied between 0.84 to 1.39, making it abundantly clear that B. badis are in good health and the waterbody is an ideal habitat for their survival. Relative condition factor (Kr) values, which varied between studies and ranged from 0.78 to 1.01, also exhibited a noteworthy difference (p&lt;0.05). For its long-term management, the above findings will be very helpful.

Reproductive cycle and sexual maturity size of landed Selene peruviana (Perciformes: Carangidae) on the coasts of the Ecuadorian Pacific

The Peruvian moonfish (Selene peruviana) is an important fisheries resource that is landed in the main fishing harbors of Ecuador. At the local level, little information is available regarding the biology of this species, which hinders the development of management plans. The present study evaluates the reproductive characteristics of S. peruviana such as the size at sexual maturity and reproductive cycle. Specimens were obtained from artisanal and industrial catches from January 2017 to December 2018. The morphometric characteristics, sex, and maturity stage of 886 specimens were determined, and the gonadosomatic index (GSI), hepatosomatic index (HSI), and relative condition factor (Kn) were estimated. The length-weight relationship and length at sexual maturity (L50) were evaluated with an allometry equation and multi-model analyses, respectively. The mean capture size (total length, TL) was 23.62 cm for males and 22.97 cm for females. A sex ratio (M:F) of 0.70:1.00 (χ2 = 26.28, P &lt; 0.05) was obtained. The allometric factor of the length-weight relationship for both sexes (b) was 2.63 (t = 12.16, P &lt; 0.05), and the coefficient of determination (r2) was 0.89, which suggests that negative allometric growth was present. The L50 (TL) was estimated to be 22.61, 23.86, and 23.27 cm for males, females, and sexes combined, respectively. The monthly GSI, HSI, and Kn values were significantly different (K-W, P &lt; 0.05) among study months. The maximum GSI values were observed in February and March, which constituted the period of highest reproductive activity. The HSI and Kn values exhibited similar trends. The size at sexual maturity was similar to the average catch size, which could indicate that S. peruviana is currently at the limit of its optimal catch size.

Life history (length-weight relationship, conditional factors, reproductive aspects), stomach contents and nursery ground of stingray in the Arafura Sea

Stingrays are a resource that is vulnerable to overfishing and habitat degradation. The research was conducted to obtain data and information that is still lacking and much needed for the utilization and protection of stingrays, including; life history, stomach contents, and nursery ground. The study was conducted in October - November 2018 by exploratory, including taking stingrays by trawling and measuring habitat conditions with Conductivity, Temperature, and Depth. The results showed a total stingrays are 744 individuals, weighing 2,986.6 kg and 24 species. Individual stingrays have a width disc range of 9-134 cm and a weight of 20-67000 g. The growth pattern of stingrays is generally allometric, except for Gymnura zonura. The average value of the relative condition factors is generally >1, except for Aetomylaeus maculatus and Brevitrygon walga. Stingrays have an unbalanced sex ratio, gonads consist of 43% adolescent and 57% mature, and the number of neonates is 1-6 /parent. The correlation between clasper length and disc width is generally positive, except for Hemitrygon longicauda. Of the stomach contents of all stingray species, 64 % is shrimp, Himantura leoparda which have various prey. The area east of Aru and west of Papua are the locations used as nursery grounds by most various stingrays. Nursery grounds of Stingray is generally shallow coastal areas with low oxygen, eutrophic and high turbidity. The results of this study are expected to be used as a basis for managing stingray resources in the Arafura Sea and further research is recommended to be carried out in four different seasons.