Open Access Original Research Article

Ontogenetic Shifts in Oxygen Uptake in Common Mudskipper (Periophthalmus kalolo) and its Role in Microhabitat Selection

Wayne A. Bennett, Jennie Rohrer, Nadiarti N. Kadir, Theresa F. Dabruzzi

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2021/v11i630218

Aims: The common mudskipper, Periophthalmus kalolo is a tropical, amphibious fish that utilizes both air and water as a respiratory medium. Adult oxygen uptake in water and air is well studied, but requirements of post-metamorphosed fish are virtually unknown. Our study quantifies how ontogenetic shifts across mudskipper life stage affects microhabitat choice.

Study Design: metabolic rates in air and water were estimated for common mudskippers with mass values from 0.03 to 28.9 grams. Fish in each media were divided into 5 standard length classes (≤ 2.00, 2.01-4.00, 4.01-6.00, 6.01-8.00, ≥ 8.01 cm). Oxygen consumption for each class was calculated as the mean individual oxygen consumption for the group.

Place and Duration of Study: Hoga Research Laboratory, Wakatobi National Park, Sulawesi, Indonesia, between June 14 and August 26, 2005.

Methodology: Gilson manometry, and flow-through respirometery was used to determine respective aerial and aquatic oxygen uptake values for common mudskippers.

Results: Mudskipper lengths varied by an order of magnitude (1.0 to 10.3 cm) and mass varied by three orders of magnitude (0.03 to 17.3 g). Mass-adjusted aerial metabolic rates of fish 2.00 cm or less in length, consumed up to ten times more oxygen than larger fish. whereas, aerial consumption values for size classes 2.01 cm and above did not differ significantly from each other (ANOVA: F4,112 = 40.29, P < 0.0001; SNK, α = 0.05).

Metabolic rates of submerged fish fell into two statistically distinct subsets. mudskippers with lengths of 4.00 cm or less had significantly higher metabolic rates than fish in remaining size classes; however, mean oxygen uptake values of fish within subsets did not differ significantly (ANOVA: F4,87 = 6.89, P < 0.0001; SNK, α = 0.05). When oxygen consumption values at each size class were compared, only the smallest mudskipper size class (£ 2.00 cm) differed significantly between air and water (t-test: df = 34, t = 3.44, P < 0.0001). Mudskippers 2 cm in standard length or smaller consumed over seven times more oxygen in air than water. All other size classes had similar rates of oxygen uptake in air and water and air:water oxygen uptake ratios fell to approximately 1:1.

Conclusions: (1) Common mudskippers select different mangal habitats based on developmental life stage. (2) Small, post-metamorphosed fish <2 mm in standard length, prefer cool shaded mangal areas, whereas, larger mudskippers utilize sun-exposed zones.

(3) Post-metamorphosed fish, consume 10X more oxygen than all other size groups, confirming that juveniles are well suited to aerial respiration oxygen shortly after hatching. (4) Emerged post-metamorphosed fish exploit cooler, wetter pool habitats, thereby ameliorating problems of desiccation, excretion, and/or predation. (5) Ontogenetic shifts are a key life-history event in P. kalolo that promotes wider mangrove habitat use, and plays an important role in establishing common mudskipper as a key mangal species.

Open Access Original Research Article

Analysis of Added Value of Fish Drumstick at Home Industry "Adisyafidz Barokah" Nagreg, Bandung Regency, West Java

Muhammad Firham Ramadhan, . Junianto

Asian Journal of Fisheries and Aquatic Research, Page 9-13
DOI: 10.9734/ajfar/2021/v11i630219

Research was conducted for one month starting from 16 November 2020 to 17 December 2020 at home industry "Adisyafidz barokah" Nagreg, Bandung regency, West Java province, Indonesia. Catfish (Clarias sp.) is one of the fish that preferably consumed by the people of Indonesia. This opportunity is used by Mr. Mansyur as owner of home industry "Adisyafidz Barakoh" to process various products made from catfish, one of them is fish drumstick. This product is very popular among children and adults. This research aims to determine the added value and profit of fish drumstick products in the "Adisyafidz Barokah" Home Industry. The added value was analyzed using the Hayami method. The research procedure is carried out with the first stage of making fish drumstick products according to the steps that are usually done at home industry. Then the next step is to conduct interviews with the owner of the Home Industry Adisyafidz Barokah and also with several employees to get information related to the prices of main and additional raw materials as well as the marketing prices of fish drumstick. The data obtained were analyzed to see the added value based on the Hayami method. Based on the results of the research, it was concluded that the processing of catfish into fish drumstick products added value more than 0, wich mean this business was feasible to carry out. This processed product has an added value of IDR. 137,000.00 from 4 kg of fish drumstick products with 12 kg of catfish as raw material. The profit obtained from processing catfish into fish drumstick in one production (12 kg of raw material) is IDR. 110,600.00, percentage of profit is 80.07%.

Open Access Original Research Article

Assessment of Fish Farmers Use of Recommended Management Practices in Oyo State, Nigeria

B. Adelodun Oluwatobi, O. Adekola Festus, A. Rafiu Rasheedat, S. Imafidon Ailele

Asian Journal of Fisheries and Aquatic Research, Page 14-20
DOI: 10.9734/ajfar/2021/v11i630220

The enhancement of fish production through aquaculture can be brought about by enhancing farmers’ utilization of information on new innovations and recommended practices. This study was carried out to assess fish farmers’ use of recommended management practices in Oyo state. One hundred and fifty fish farmers were selected from the four agricultural zones in the state using multistage sampling technique. Primary Data were analyzed using descriptive and multiple regression analysis. Most of the fish farmers were male (88%), 78% had tertiary education and 68% had <11years of experience in fish farming. The study revealed that the rate of adoption of recommended aquaculture management practices was 46.7%. The regression analysis also revealed a linear relationship between the socio-economic characteristic and adoption of RAMP (R2 = 0879). Educational background (p<0.05), years of experience (p<0.1) and method of farming (p<0.05) were positively significant. The use of these management practices were also limited by different factors as revealed in the study. In conclusion, the adoption of recommended management by fish farmers is not encouraging enough. Strong cooperation between the fish farmers and extension agents was highly recommended.

Open Access Original Research Article

Morphometric, Meristic and Conditional Factor Characterization of Redbelly Tilapia (Coptodon zillii) in Lake Komadugu, Yobe State, Nigeria

Eze Felix, Eyo Victor Oscar, Abraham Oghenemarho Victory

Asian Journal of Fisheries and Aquatic Research, Page 21-32
DOI: 10.9734/ajfar/2021/v11i630221

This research was carried out to study the morphological characteristics of Coptodon zillii from Lake Komadugu in Yobe State, Nigeria using morphometric measurements, meristic counts and length-weight relationship. A total of 60 specimens of Coptodon zillii were purchased from the fisher folks at landing site in Lake Komadugu, examined and analyzed for morphometric and meristic characterization. The results revealed that all the morphometric characters of C. zillii in Lake Komadugu varied whereas some meristic characters including mean number of rays on pectoral fin (8.00 ± 0.00), pelvic fin ray (5.00 ± 0.00), anal fin spine (3.00 ± 0.00), pelvic fin spine (1.00 ± 0.00) and number of lateral line (2.00 ± 0.00) were constant. A significant linear relationship was established and represented by the equation: W =0.008SL2.097 (r =0.6410 d.f. = 58) for male, W =0.001SL3.013 (r = 0.9600 d.f. = 58) for female. Mean condition factor which was not significantly different (p>0.05) showed that male C. zillii had 1.80 ± 0.27, female (1.92± 0.26) and pooled sex (1.86 ± 0.25). Findings of this study implies that C. zillii from Lake Komadugu are in good health. In conclusion, these findings are very useful in stock assessment, population dynamics, sustainable management and conservative measures of C. zillii in Lake Komadugu.

Open Access Review Article

Review Article: Fish Bone Collagen

Andre Wijaya, . Junianto

Asian Journal of Fisheries and Aquatic Research, Page 33-39
DOI: 10.9734/ajfar/2021/v11i630222

Fishbone collagen is an alternative source of bovine and pig collagen. The purpose of this article is to review the types, benefits, extraction methods and characterization of collagen from fish bones, especially freshwater fish. The result of the review shows that the collagen from tilapia bones is shaped like a sheet with a slight porous surface and is of type I. Collagen extraction begins with bone disease from the remaining fat, then degreasing and the next step is extraction. After the extraction process is complete, filtration is carried out to store the filtrate or residue, then the collagen is purified by salting-out with NaCl. Collagen yield and collagen pH value from collagen extraction were different for each type of fish bone. The difference in yield value and protein and amino acid content in the resulting collagen can be caused by differences in the extraction method, the concentration of the solution used, whether acid or alkaline, and the neutralization process and the type of raw material. Fishbone collagen has good benefits in the cosmetic and pharmaceutical fields.