##### First Occurrence of Heniochus intermedius Steindachner, 1893 in The Syrian Marine Waters (Levantine Basin)

Asian Journal of Fisheries and Aquatic Research, Page 14-18
DOI: 10.9734/ajfar/2022/v20i130486

On May 18, 2022, a Heniochus intermedius (Steindachner, 1893) individual with a total length of 140 mm and a total weight of 58.4 g was caught by trap at a depth of 14 meters, with a mixed bottom of sand and stones, in front of the beach of Banias (N: 35) ° 7. 0.5' 17', E: 35° 54' 14.73). In this work, we document the first record of a Red Sea species (Lesbesian immigrant), Heniochus intermedius (Steindachner, 1893), in the Syrian coast, the seventh record in the entire Mediterranean. As a result, the number of fish migrating from the Red Sea to the Syrian marine waters has reached 82 species. The methods of introduction and arrival of fish of this species into the Mediterranean are also discussed.

##### Level of Polycyclic Aromatic Hydrocarbon (PAH) Contamination in Braised Fish Marketed and Consumed in Eight Communes in the District of Abidjan, Côte D'ivoire

Adama Coulibaly, Komissiri Dagnogo, Vessaly Kallo, Mariam Doumbia, Amy Carine Dongo, Godi Henri Marius Biego, Ardjouma Dembele

Asian Journal of Fisheries and Aquatic Research, Page 1-13
DOI: 10.9734/ajfar/2022/v20i130485

Aims: The objective of this study is to evaluate the exposure of consumers to polycyclic aromatic hydrocarbons (PAHs) and to estimate the health risk related to the consumption of braised fish from eight (8) communes of the District of Abidjan in order to contribute to the protection of these consumers.

Study Design: This experimental study consisted in sampling fish cooked with charcoal embers in the collective catering circuit, followed by the determination of PAHs and the estimation of health risks.

Place and Duration of Study: The braised fish samples were collected in the Autonomous District of Abidjan and analyses were performed at the Central Laboratory of Agrochemistry and Ecotoxicology between January and March 2015.

Methodology: PAHs were extracted and purified on a Bond Eut C18 cartridge and then determined by High Performance Liquid Chromatography (HPLC) according to ISO 15753.

Results: All the eight (8) PAH molecules investigated were found in varying concentrations and numbers in the braised fish depending on their origin. Concentrations range from 0.013 $$\mu$$g/kg to 1.246 $$\mu$$g/kg for individual molecules and from 0.670 $$\mu$$g/kg to 3.271 $$\mu$$g/kg for total PAHs (TPAHs) regardless of the municipality and PAH molecule. In addition, 0-25% of the samples are non-compliant with the standard for PAHs and 0-13% for TPAHs. Also, braised fish collected in the communes of Marcory and Plateau contain eight (8) molecules while variable numbers of molecules are found in those from other communes. Thus, seven (7) molecules were found in four communes (Abobo, Cocody, Koumassi, Port-Bouet) and six (6) molecules in two communes (Treichville, Yopougon). However, all hazard quotients (0.00000-0.00041) are less than 1 regardless of the municipality and PAH molecule.

Conclusion: These results are essential to improve the safety of braised fish made available to consumers of differents communes of the District of Abidjan. These results recommend the consideration of other sources of PAH in the diet although the hazard quotients are less than 1 because PAH molecules have a cumulative power in the body.

##### Proposal of Unidirectional Laminar Flow Model to Black Waters Lakes in Central Amazonian, Brazil: A Case Study

A. J. Darwich, F. Aprile

Asian Journal of Fisheries and Aquatic Research, Page 19-28
DOI: 10.9734/ajfar/2022/v19i5474

This case study was conducted in Tupé lake a Ria black water lake in the Negro River basin, Central Amazonian, with historical data from 2001 to 2018. The aim was to propose a unidirectional laminar flow model, relating it to the limnological data, in special temperature and dissolved oxygen in the water column. Climatological, geomorphological and hydrological data as well as general environmental factors were included for the construction and study of the water circulation model. The Tupé lake (3º01'33.5 ”- 3º02'47.8” S; 60º14'57.5 ”- 60º16'1.2” W) is supplied in most of the time by waters coming from forest streams. As a result, the lake has specific properties of circulation and flow of nutrients, being considered a meromictic lake with permanent stratification. Although the statistical test suggests that there is no difference in the average density between the vertical layers of water, the observed pattern confirms exactly the opposite, reinforcing the existence of permanent stratification due to uneven mass densities between the epilimnion and hypolimnion. The continuous and almost permanent unidirectional laminar flow from the forest streams guarantees the state of non-conservation of energy at the bottom of the lake, with constant renewal and variation of this behavior. A laminar flow model was established for the lake, highlighting the partial circulation of water in the epilimnion. The condition of permanent stratification is not common to be observed. Thus, with these results, a model can be established to help identify this behavior in other Ria lakes in the Amazon region.

##### Proximate Composition Analysis of Spirulina platensis in Lab Scale Cultivation: Prospects of Digested Rotten Guava as a Culture Media

Md. Hashibur Rahman, Mohammad Ashraful Alam, . Flura, Md. Saiful Islam, Md. Arifuzzaman, Md. Moniruzzaman, Asma Jaman, Sharmin Sultana Mukti, Anik Talukdar, Md. Abu Kawser Didar

Asian Journal of Fisheries and Aquatic Research, Page 29-38
DOI: 10.9734/ajfar/2022/v19i5475

An experiment was conducted to evaluate the proximate composition of Spirulina platensis and growth performance in supernatant of different concentrations (supernatant of 20, 40 and 60 rotten guavas) of digested rotten guava medium (DRGM). The growth rates in terms of optical density, dry cell weight and chlorophyll a of spirulina were varied from each other. The cell weight of Spirulina was attained a maximum of 0.818 ± 0.003 mg/L in 60% DRGM followed by 0.815 ± 0.0015 and 0.809± 0.0012 mg/L in supernatant of 20 and 40%, respectively on the 10th day of culture. Similar trend was also observed in the case of optical density of the media contained Spirulina, chlorophyll a content (mg/L), total biomass (mg/L), specific growth rates (on the basis of cell weight and chlorophyll a) and total biomass of Spirulina. Cell weight of Spirulina grown in these media had highly significant (P < 0.01) correlation with the chlorophyll a content (r = 0.746) and total biomass  (r = 0.742) of Spirulina. The growth performance of Spirulina in supernatant of 60% DRGM was significantly (P < 0.01) higher than that of grown in 20% and 40% DRGM. The percentage of crude protein was found 53.35 ± 0.32% in supernatant of 40% DRGM. The crude lipid was attained of 10.15 ± 0.14% in supernatant of 60% DRGM which was significantly (P < 0.05) higher than that of grown in 20% and 40% of DGRM.

##### Prevalence of fish Parasites IN Bagrus bayad and Protopterus annectens from Upper River Benue in Mutum Biu, Taraba State, Nigeria

S. Omeji, S. G. Solomon, S. E. Ogaba

Asian Journal of Fisheries and Aquatic Research, Page 39-53
DOI: 10.9734/ajfar/2022/v19i5476