Search Results

1 - 10 of 60 items :

  • "morphometric characteristics" x
Clear All
Size-At-Age Variability and Sexual Dimorphism of Morphometric Characteristics in the Late Ontogenesis of the Marsh Frog, Pelophylax Ridibundus (Anura, Ranidae), from Terrytory of Crimea

Abstract

We study size-at-age and sexual variability of morphometric characteristics of the marsh frog. According to the size of the body, males were divided into three size-age groups (juvenis, subadultus, adultus), females — into four groups (juvenis, subadultus, adultus, adultus-I). We found that the chronological age of frogs (skeletochronology) does not always correspond to their biological age (size and proportions of the body). We noted that the semi-adult males are reliably larger than females by mean values of 26 studied morphometric characters. Males and females of “adultus” group do not differ by linear body size, significant differences were found in body proportions (7 characters). For the females of “adultus-I” group, the mean values of 26 characters are significantly larger than for “adultus” males. The results of our study showed that with the age of the marsh frog, the level of exhibition, directionality and structure of morphometric sex differences changes.

Open access
Estimates of the Population Parameters and Exploitation Rate of Pontic Shad (Alosa Immaculata Bennett, 1835) in the Romanian Black Sea Coast

Abstract

Sex ratio, morphometric characteristics, age and growth for Pontic shad from Romanian Black Sea Coast were examined. A total of 2.133 individuals were caught between March 2012 and September 2013. Female : male sex ratio was 0.62. According to the age reading, distribution varied form II to V year. The von Bertalanffy equation and growth performance index were determined by ESP software in Pontic shad. The asymptotic length (L∞ = L infinity) of Pontic shad generated by the ELEFAN I method, after introducing total length data for the two years of study, was 41.5. The natural mortality instantaneous coefficient (M) of the entire Pontic shad population, calculated according to Pauly’s empirical equation, using the growth parameters of the Von Bertalanffy formula and the mean annual temperature of the two study years of 13°C, recorded the following values: M = 0.585 in 2012 and M = 0.639 in 2013. According with the resultants, it is recommended to perform a sustainable fishing which allows the capture of legal-sized of fish.

Open access
Association of Ejaculate Sperm Counts with their Morphological and Morphometric Characteristics in Hypor Boars

during the storage of semen from genetically different males using two diagnostic methods. Can. J. Anim. Sci., 94: 601–606. Wysokińska A., Kondracki S. (2014 b). Assessment of sexual activity levels and their association with ejaculate parameters in two-breed hybrids and purebred Duroc and Pietrain boars. Ann. Anim. Sci., 14: 559-571. Wysokińska A., Kondracki S., Banaszewska D. (2009). Morphometrical characteristics of spermatozoa in Polish Landrace boars with regard to the number of spermatozoa in an ejaculate. Reprod. Biol., 9: 271-282. Wysokińska A

Open access
Effect of selected morphometric characteristics on the incidence of wind damage to forest in the Low Tatras Mts. (Slovakia)

Abstract

The paper addresses the occurrence of incidental felling caused by wind in relation to selected morphometric characteristics. The investigation was conducted in the Nízke Tatry Mts. and Kozie chrbty Mts. (Slovakia) in the period of 1984–2003. A frequency of incidental felling in response to the elementary morphometric factors - altitude, slope and aspect – was evaluated. The assessment was based on the probability analysis. The results describe the probability of incidental felling occurrence in the prescribed categories of used morphometric factors across the study area. The most susceptible forest stands were found to be distributed in the elevation range from 731 – 1,120 m a.s.l. (48.13% of the research area); on slopes less than 58% (75.89% of the research area); with the aspect from 106 to 40° (53.06% of the research area). The proposed methodology can be used for the assessment of the effect of diverse factors on the occurrence of incidental felling caused by various forest disturbances. The results can be used as input data for risk models supporting forest management.

Open access
Morphometric characteristics of crayfish, Cherax gherardiae, from Maybrat, West Papua, Indonesia

rice straw on crayfish, Procambarus clarkii (Girard), culture in rice fields – Aquaculture 31: 339-359. Chybowski Ł. 2007 – Morphometrics, fecundity, density, and feeding intensity of the spiny cheek crayfish Orconectes limosus (Raf.) in natural conditions – Arch. Pol. Fish. 15: 175-241. Chybowski Ł. 2014 – Morphometric differentiation in four populations of signal crayfish, Pacifastacus leniusculus (Dana), in Poland – Arch. Pol. Fish. 22: 229-233. Deniz (Bok) T., Harlioglu M.M., Deval M.C. 2010 – A study on the morphometric characteristics of

Open access
Peculiarities of Embryonic and Post-Embryonic Development of Оesophagostomum dentatum (Nematoda, Strongylidae) Larvae Cultured in Vitro

Abstract

Morphometric peculiarities of the development of Оesophagostomum dentatum Rudolphi, 1803 from egg to infective larva were studied under laboratory conditions at various temperatures. The determined optimum temperature for embryonic and post-embryonic development of О. dentatum larvae from domestic pig (Sus scrofa domesticus Linnaeus, 1758) is 22 °С. At this temperature, 81 % of larvae develop to the third stage (L3) on the 10th day. Temperatures of 24 °С and 20 °С are less favorable for the development of the nematode, at those temperatures only 67 and 63 % of larvae, respectively, reached infective stage by the 10th day of cultivation. Embryonic development of О. dentatum eggs is characterized by their lengthening (by 8.87-9.50 %, р < 0.01) and widening (by 6.77-9.35 %, р < 0.05-0.01), and post-embryonic larval development is associated with lengthening (by 4.59-17.33 %, р < 0.01-0.001).

Open access
Phototactic Response and Morphometric Characteristic of Climbing Perch Anabas testudineus (Bloch, 1792) Under Culture System

Abstract

Phototaxis in climbing perch (Anabas testudineus) was investigated by subjecting fish to LED light traps (blue, green, yellow, orange, red, white) and control (total 13 traps). The trap was constructed of polyamide (PA) nylon monofilament (31.75 mm mesh size), fastened around two wire ring frames (∅ 490 mm) with a net height of 270 mm. A lamp was placed on the bottom of the trap. 96 individuals, consisting of 34 males and 62 females, were analysed. Both continuous and blinking light traps were considerably higher in the number of catch compared to the control. The body size of catch ranged from 76-135 mm TL and 8.00-55.00 g W. The mean YPUEs (yield per unit effort) for male and female were 4.00 ± 2.25 and 7.00 ± 4.50 g trap−1 trial-1, respectively. The CPUEs (catch per unit effort) for continuous, blinking light traps and the control ranged from 0.43 to 0.93, 0.21 to 0.86, and 0.21 fish trap−1night−1, respectively. The mean condition factor (K) values of 2.10 ± 0.40 for males and 2.13 ± 0.34 for females indicate fish with better condition. Positive group responses of fish were more pronounced in the middle size classes between 90 and 109 mm TL. Negative allometric growth pattern (b) (1.7271-1.8828) was observed, indicating that the culture system should be refined. A. testudineus showed positive phototaxis to the “colors of light”. In addition, efforts to collect climbing perch from the wild for breeding and commercial purposes may benefit from this study.

Open access
Morphometric Characteristics of Catfish Silurus triostegus (Heckel, 1843) from the Tigris and Shatt Al-Arab Rivers, Iraq

Abstract

Thirteen morphometric characters of catfish Silurus triostegus were studied from three localities on the Tigris and Shatt al-Arab rivers, Iraq. Monthly samples revealed no significant differences between genders. Positive allometric growths for all morphometric characters studied were observed. This study gives information to fishery biologists about morphometric characters of S. triostegus from the Tigris and Shatt al-Arab rivers to assist in planning of conservation strategies for this fish species.

Open access
Morphometric Characteristics of the Reproductive System in Polish Large White and Polish Landrace Gilts at 100 Kg Body Weight / Charakterystyka morfometryczna układu rozrodczego loszek wielkiej białej polskiej i polskiej białej zwisłouchej przy masie ciała 100 kg

Abstract

The study involved an analysis of the developmental stage of reproductive organs collected at slaughter from 160 gilts (Polish Large White (PLW), n = 80; Polish Landrace (PL), n = 80) at 100 kg body weight. Due to a large variation in slaughter age (140-190 days), three groups of animals were set up: A (less than 160 days), B (160 to 180 days) and C (more than 180 days). PL gilts reached their slaughter weight earlier than PLW gilts (P≤0.05). Uterine weight increased with the age of animals but due to high variability and large deviations from the mean value, statistically significant differences were demonstrated only between gilt groups A and B for both breeds together (120.57 g vs. 148.83 g; P≤0.05). Larger differences related to the age of the gilts were found for cervical length between the groups compared (P≤0.01). The total length of the right and left uterine horns showed a significant increase with age in PLW gilts (P≤0.05). The ratio between uterine weight without ligament and the length of uterine horns (g/cm) was significantly higher in group B than in group A in gilts of both breeds together (P≤0.05), which might indicate thickening of the uterine walls. Uterine capacity was significantly higher in older animals yet due to a large variability of this trait, no significant differences between the groups were shown. The length and diameter of oviducts, the weight of each ovary, their sum and dimensions did not reveal any consistent changes associated with the age or breed of pigs. However, the size of the ovaries determined volumetrically and reported as the volume of ovaries in gilts of both breeds was significantly larger in group B compared with C (P≤0.01). No significant differences related to the studied traits were stated between PLW and PL prepubertal gilts. However, the effect of age on morphometric development of the reproductive system was more pronounced in PLW than in PL gilts.

Open access
Presence of Meloidogyne enterolobii on Jalapeño pepper (Capsicum annuum L.) in Sinaloa, Mexico

SCAR amplicon was in one direction (MK7-F). The IGS2 sequences were processed using the BioEdit software (version 7.2.5) to obtain a consensus sequence. Nucleotide sequences were aligned using BLAST (National Center for Biotechnology Information). Results Morphological identification The morphological and morphometric characteristics of the second-stage juveniles (J 2 ) and mature females of studied population of RKN were similar to those reported in the original description of M. enterolobii (M. mayaguensis) ( Yang & Eisenback, 1983 ; Rammah

Open access