Positive Allometric Pattern Research Articles

Growth And Food Habits Of Red Snapper (Lutjanus Malabaricus) Catched In The Waters Of Central Mamuju, Makassar Strait

Red snapper is a basic fish that has economic value with intensive use and high market demand, so it is thought to have undergone biological changes. In this regard, the research aims to analyze the size distribution, growth and food habits of red snapper caught in Mamuju waters. This research is classified as a survey type with data sources from fishermen's catches. The results showed that the average size distribution of red snapper from Kambunong was ± 36.93 cm for males and ± 44.65 cm for females, Babana ± 29.81 cm for males and ± 41.14 cm for females, Pangale ± 31.45 cm for males and ± 33.75 cm female. The growth pattern of samples from Pangale and Kambunong was negative allometric, while Babana had a positive allometric pattern. The main types of food are white shrimp, tiger prawns, lencam fish, crab and lobster while cuttlefish is a complementary food. To catch red snapper, both males and females should use red snapper as their main food

Study of some morphometric and meristic characteristics of Alepes vari (Cuvier, 1833) collected from the Arabian coast.

The present study examines the correlations between fifteen morphometric and ten meristic characters and total length (TL) of males, females, and combined sexes of Alepes vari (Cuvier, 1833) collected from Karachi fish harbor, West Wharf of Karachi Coast. Statistical analyses of linear regression relationships show mostly strong correlations (r≥0.70; p<0.05) between total length (TL) and most morphometric characters in males, females, and combined sexes, except the height of pectoral-fin (PFH), and pelvic-fin base length (PelFL); whereas, meristic characters were found to be constant and indicate weak or negative type correlations (r≤0.50; p>0.05) with total length (TL). Hence, according to our present results, there is a direct relationship between the total length of fish and all morphometric characters, which were found to be the best indicators of positive allometric pattern growth in fish. Moreover, analysis of the 2-sample t-test revealed (t-test; p>0.05) that no sexual dimorphism was reported in Alepes vari. Thus, our present study could be valuable in systematic classification, sexual dimorphism, and management of this species on the Karachi coast.

The Effect of Probiotics Probio_Fmubb on The Growth of Catfish (Clarias sp.) in Fixed Net Cage Systems

The increase in aquaculture activities has made most people interested in working on it. Catfish is one of the cultivation commodities that are in great demand by the public. This study aims to analyze the growth of probiotic catfish (Clarias sp.) in soil ponds with the KJT system. The research was conducted from September to November 2022 at the pond of Mr. Fitra, a member of the Pokdakan Mina Berkah Mandiri, Balunijuk Village, Bangka Belitung. The research method includes calculating the growth of catfish and testing water quality which is accompanied by PP No. 22 years 2021. Fish growth shows a positive allometric pattern, meaning that weight growth is more dominant than length growth. This is thought to be a positive effect of the probiotic Probio_FmUBB on catfish growth and pond water quality. Water quality is sufficient to support the growth of catfish, especially the main parameters such as temperature, pH, and DO. Known water quality values such as temperature parameters 27-30oC, pH 6.05, and DO 5.03 mg/L affect catfish growth. Feeding full pellets is very supportive of positive allometric growth patterns and optimal catfish growth. Suggestions can be developed for catfish enlargement by Pokdakan with persistence while raising fish.

Relative growth and sexual dimorphism in the hermit crab Clibanarius signatus Heller, 1861 (Anomura, Diogenidae) from the northern coast of the Persian Gulf, Iran

AbstractThe purpose of this study was to investigate the relative growth and sexual dimorphism in the hermit crab Clibanarius signatus. The evaluation was done with 955 specimens (494 males, 251 females, and 210 intersexes) captured in Persian Gulf (Iran) during January to December 2015. Animals were submitted to measurements related to weight (BW, total wet weight) and body size related to cephalic shield (SW, width; and SL, length) and propodus of both chelipeds (CPL, length; and CPW, width). Males were larger and heavier than females and intersexes. Both males and females showed a negative allometric growth for the SL–BW and SL–SW relationships, but a positive allometric growth to intersex specimens. To SL–CPL relationship, a negative allometric growth was confirmed in males and females independent of the laterality of the CPL, whereas a contrast was verified in intersexes, with a positive allometric growth occurred for both hands. To SL–CPW relationship, a negative allometric growth (b &lt; 1) occurred in females, independent of the laterality of the CPW, while in males, a positive allometric pattern was confirmed. In intersexes, this relationship was positive except for the right CPW which was isometric. Sexual dimorphism was evident in Clibanarius signatus, with males being the largest and females the smallest specimens in the population.

The Length-weight relationship and condition factor of Barbonymus gonionotus from Nyaung Kaing In, Sagaing Division, Myanmar

The length-weight relationship and condition factor of Barbonymus gonionotus from Nyaung Kaing In, Sagaing Division, Myanmar were carried out from October, 2016 to February, 2017. A total of 100 specimens were selected randomly during the study period. The length-weight relationship was calculated by using the regression analysis. The results showed that the average (b) values of all samples were 3.20 indicating the positive allometric pattern. The average condition factor (K) was 2.9 and the average correlation coefficient (r) was 0.99. Therefore this result indicated that there was a good correlation between length and weight of the fish. Moreover, the condition factor (K) value greater than 1 indicated good condition of the fish inhibiting the aquatic ecosystem is conducive for the optimum growth of this fish.

Stomach content analysis and length-weight relationship of the Pontic shad Alosa immaculata Bennett, 1835 (Pisces: Clupeidae), from the eastern Black Seacoast of Turkey

Diet composition of the anadromous Pontic shad Alosa immaculata Bennett, 1835 was studied in relation to season and body size, from samples collected from the south-east Black Sea coast of Turkey in spring, autumn and winter during the period from March 2012 - February 2013. Out of 236 samples, 226 stomachs contained food and 24 prey items were identified. Nematoda sp. and teleosts were the main prey items with index of relative importance (IRI) of 59.3 and 38.2% respectively. Seasonal analysis showed that the IRI of Nematoda sp. was 71.6% in winter, 50.6% in spring and 37.1% in autumn. The stomachs of fishes in the length range of 12.0 -19.9 cm contained a higher proportion of Nematoda sp. (IRI up to 74 - 80%). Larger fishes in the length range of 24.0-32.8 cm consumed more teleosts (&gt;45% IRI) than the others. The length-weight relationship showed that females grow in positive allometric pattern while males have isometric growth.

PERTUMBUHAN, UMUR, DAN DIMORFISME SEKSUAL IKAN PELANGI ARFAK, Melanotaenia arfakensis Allen, 1990 DI SISTEM SUNGAI PRAFI, MANOKWARI, PAPUA BARAT

ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat.

Biofloc improves water, effluent quality and growth parameters of Penaeus vannamei in an intensive culture system

Biofloc technology was evaluated with a view to analyse utilization of nitrogenous waste from the effluent and to improve water quality and growth parameters of Penaeus vannamei in intensive culture system. The experiment was carried out in two different treatment outdoor earthen ponds of 0.12 ha, one supplemented with carbon source (molasses, wheat and sugar) for biofloc formation and other was feed based control pond with a stocking density of 60 animals m−2 in duplicate for 120 days. Water, sediment and P. vannamei were sampled at regular intervals from the both set of ponds for evaluating physico-chemical parameters, nitrogen content and growth parameters, respectively. A significant reduction in the concentration of total ammonia nitrogen (TAN) and nitrite (NO2-N) were found in the biofloc pond than that of control pond. A significant low level of nitrogen was recorded in the effluents of biofloc pond in comparison to the control. In biofloc system, a significantly elevated heterotrophic bacterial count along with reduction in total Vibrio count was noticed. A significant improvement in the feed conversion efficiency (FCR) and growth parameters of P. vannamei was noticed in the biofloc pond. Growth of P. vannamei in the biofloc pond showed positive allometric pattern with an increased survival. The microbial biomass grown in biofloc consumes toxic inorganic nitrogen and converts it into useful protein, making it available for the cultured shrimp. This improved FCR and reduced the discharge of nitrogenous waste into adjacent environment, making intensive shrimp farming an eco-friendly enterprise.

Length-weight Relationships and State of Well-being of Parachanna obscura Gunther1861, in Eleyele Reservoir, Southwestern Nigeria

The knowledge of length-weight relationship parameters has numerous practical applications in fishery research and management. However, there is currently dearth of information on the growth pattern and state of well-being of Parachanna obscura in Eleyele Reservoir. This study therefore investigates the allometry and condition factor of P. obscura inhabiting the Eleyele Reservoir, Southwestern Nigeria. 688 specimens of P. obscura were collected from artisanal fishers’ at their landing sites on a bimonthly basis for 24 months. Standard Length (SL, cm), and Body Weight (BW, g) were measured. Length-Weight Relationships (b>3 or <3-allometric; b=3-isometric), and condition factor (K) were calculated using standard formula. Data were analysed using descriptive statistics and ANOVA at α0.05. The SL and BW of P. obscura ranged from 10.6 to 39.2 and 15.3 to 830.5 respectively. The LWR were 3.04 (male) and 2.99 (female) indicating positive allometric pattern of growth in male and negative allometric growth in female. The growth coefficient b ranged between 2.877 in July and 3.348 in May, with very significant coefficient of determination r2 for all the months. Variations recorded in the b value of different size groups showed positive allometric growth in 10.1 cm -15.0 cm, 15.1 cm -20.0 cm and 20.1 cm -25.0 cm, but negative allometric growth in 25.1 cm -30.0 cm and 30.1 cm -40.0 cm. The maximum (1.54 ± 0.12) K was noticed during March 2016 and the minimum (1.30 ± 0.7) K in September 2015. Significant variation occurred in K with size groups. The mean K value in females (1.43 ± 0.21 and 1.44 ± 0.20) was higher than males (1.40 ± 0.18 and 1.42 ± 0.17) for 2014-2015 and 2015-2016, respectively. The results indicated that P. obscura were thriving very well in Eleyele Reservoir.

Some population parameters of Ruditapes philippinarum (Bivalvia, Veneridae) on the southern coast of the Marmara Sea, Turkey

Ruditapes philippinarum, a venerid clam, is a dominant species in the sandy and muddy areas in the coastal waters of the Marmara Sea. Intensive commercial harvesting of this species is conducted in these regions. We studied the population dynamics of R. philippinarum on the southern coast of the Marmara Sea (Bandırma). Samples were collected on a monthly basis between September 2012 and August 2013. Seasonal von Bertalanffy growth parameters using the length–frequency distribution of R. philippinarum were estimated at L ∞ = 67.50 mm and K = 0.33 year−1, and the seasonal oscillation in growth rate was 0.53. The slowest growth period was in January. The growth performance index and potential lifespan were 3.182 and 8.06 years, respectively. The growth relationship was confirmed to have a positive allometric pattern. The average total mortality rate was estimated to be 0.777 year−1, whereas the natural and fishing mortality rates were 0.539 and 0.238 year−1, respectively. The current exploitation rate of R. philippinarum was 0.306. The recruitment pattern peaked during June–August, and spawning occurred between May and August. The results of this study provide valuable information on the status of R. philippinarum stocks.

Parasites and Morphometric Indices of Frozen Fish Sold in Nsukka Urban Market, Enugu State, Nigeria

The parasites and morphometric indices of frozen fish sold in Nsukka Urban Market in Nsukka Local Government Area of Enugu State, Nigeria were investigated between June and December 2008 to determine the parasite prevalence, mean intensity and abundance and some morphometric indices associated with parasitism. Two species of acanthocephalan endo-parasites were isolated from Savreda sp namely, Gorgorhynchus sp and Paragorgorhynchus sp with overall prevalence of 35.4%. The mean intensity for Gorgorhynchus sp was 14.1+0.2 and the mean abundance was 10.0+0.1. Paragorgorhynchus sp had mean intensity of 1.2+0.1 and mean abundance of 10.0+0.1. Some morphometric characteristics were calculated to correlate weight against standard length (SL) and total length (TL). There was a significant correlation between mean SL (2.76 + 0.59 cm) and mean TL (3.23+0.15 cm) with mean body weight (BW = 320 +0.49g) for Sardinella sp and mean SL (32.6+0.71cm) and TL (35.9+0.66 cm) with mean BW (440+0.13g) for Savreda sp. The mean condition factor (K) fell in 0.01+0.001 in both species, this shows that the fish overall condition is in a good state, whereas b-value (b=1.7) shows that the Savreda sp which hosted parasite had a negative allometric growth pattern (b3) showing a positive allometric pattern. The negative allometric pattern for Savreda sp is probably as a result of the parasites they hosted.Keywords: Parasites, Morphometric Indices, Frozen fish