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Regular Issue

Research Article | May 7, 2024
Metamorphic Success and Production cost of Holothuria scabra Reared on Microalgae Concentrates Compared with Live Microalgae
Tomilyn Jan S. Garpa*, Olivier Josh C. Caasi, Marie Antonette Juinio–Meñez

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The production of live microalgae poses challenges for the expansion of sandfish hatcheries, hindered by high costs and limited technical resources. In relation to this, the use of three imported commercial concentrates (Instant Algae®) - TW1200 (Thalassiosira weisflogii), TISO1800 (Isochrysis sp.), and Shellfish1800 (mixed diatom) - were compared with live Chaetoceros calcitrans (CC). The diet efficacy was evaluated based on larval development, growth, and survival to late auricularia (LA) with hyaline spheres (HS), and the number of post-settled juveniles. Larvae reared with TW did not progress beyond LA, while those fed CC exhibited earlier LA development, larger sizes (1028.43 ± 19.38 µm), and significantly more post–settled juveniles (9,268 ± 2,183.79) compared to SHELL and TISO.

Research Article | April 25, 2024
Assessment of Socio-demographic Predictors of Fish Farmers’ Access to Formal Credit Sources in Ogun West Senatorial District, Nigeria
Olalekan J. Olaoye, Wahab G. Ojebiyi*, and Olanrewaju F. Adenika

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This study assessed socio-demographic predictors of fish farmers’ access to formal credit sources (FCSs) in Ogun West Senatorial District, Nigeria. A multistage sampling procedure was used to select 75 fish farmers. Data were elicited with an interview schedule and subjected to descriptive and inferential statistics.

Research Article | April 23, 2024
Assessment of the Acetes Beach Seine Fishery in Miagao, Iloilo, Philippines
Rother M. Gaudiel*, Harold M. Monteclaro, Jerry Ian L. Leonida, Dominique P. Mediodia, Wilfredo L. Campos

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Gear type and characteristics, catch rates and landings, and the status of the Acetes beach seine fishery in Miagao, Iloilo were investigated based on the fishery-dependent data and formal interviews on all the coastal barangays. Specimen collection for morphological identification of species and determining the catch per unit effort (CPUE) were conducted at Brgy. Damilisan, Miagao, Iloilo from November 2021 to April 2022. The genus Acetes is known to aggregate in the coastal waters during nighttime and are captured using beach seines.

Review Article | March 6, 2024
Five Decades Behind the Limelight: Crown-Of-Thorns Sea Star Outbreaks Razing the Already Ailing Philippine Reefs
Jovie E. Nicolas*, Vivia Anne Lourdes O. Pepingco, Chona Camille Vince Cruz-Abeledo

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A massive decline in Hard Coral Cover has been observed in the Philippines over the past decades, and Crown-of-thorns Sea star (COTS) outbreaks contribute to this decline. Effectively managing these outbreaks will aid in conserving the country’s reefs. However, questions about the extent of the damage caused by outbreaks, the biology of the Philippine COTS, and the nature and triggers of outbreaks dramatically limit the development of effective management.

Research Article | March 4, 2024
Status of the Salt Industry in the Philippines: Production, Challenges, and Opportunities
Ulysses M. Montojo*, Riza Jane S. Banicod, Gezelle C. Tadifa, Christine Ann S. Tila, Bernajocele Jalyn S. Baldoza, Bryan E. Tanyag, Lilian C. Garcia

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Despite being archipelagic, the Philippines heavily relies on salt imports to meet its annual demand. There is a dearth of literature on the country’s salt industry, including verified production data, current practices, and factors affecting declining domestic production.

Short Communication | March 4, 2024
Sensory Characteristics and Storage Analysis of Newly Developed Spider Conch Balls from the Spider Conch (Lambis lambis)
Joana Joy A. Saclot, Rosita T. Jumdain, Maria Liza B. Toring-Farquerabao, Kingpu O. Ajik, Marhamin H. Jumsali, Albaris B. Tahiluddin*

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Street foods, particularly in Asia, are widely consumed and enjoyed by people. Among these street foods, meatballs made from various seafood products, including fish balls, shrimp balls, and squid balls, are particularly popular. Due to the growing demand for these street foods, there is a necessity to innovate and create novel types of meatballs using other seafood products, especially those that are abundant but less utilized.

Research Article | February 14, 2024
Synthesis and Characterization of Phytoandrogen from Different Species of Pine Trees and its Potential Use for Aquaculture
Jefferson D. Gagelonia, Jhon Christian P. Suyom, Juvy J. Monserate, Ravelina R. Velasco*

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Pine pollen is an example of phytoandrogen that has been utilized as a feed additive for all animals worldwide and used as an alternative to hormone replacement therapy that can safely restore healthy testosterone levels in men. Previous on-farm trials demonstrated the effectiveness of Benguet pine pollen (Pinus kesiya) as an alternative hormone source for the sex redirection of tilapia.

Research Article | January 25, 2024
Morphological and Genetic Diversity Assessment of Freshwater Prawns (Macrobrachium spp.) in the Cairawan River, Antique Province, Panay Island, Philippines
Mary Nia M. Santos, Daisy Wowor, Minoru Ikeda, Philip Ian Padilla, Maria Rowena Romana-Eguia*

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Freshwater prawns of the genus Macrobrachium are among the most valuable cultured aquatic species in the world. The systematic study of Macrobrachium species in the Philippines has often been based on morphological trait assessment. Here, we combined morphology and molecular approaches to study the presence and actual distribution of Macrobrachium species along the Cairawan River in Laua-an, Antique Province, Panay Island.

Special Issue

Research Article | 16 May 2024
At the Onset of Gonadogenesis: A First Description of Ovarian and Testicular Macro and Microanatomical Maturation of Bullet Tuna (Auxis rochei) in Southern Philippines
John Christian D. Entia*, Niña Mae B. Nabre, Glennville A. Castrence, Blessie Justine G. Arellano, Red Arthur Duke Amoncio, James T. Wetzel, Edna P. Guevarra

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Structural and functional maturation in gametogenesis through comprehensive histoarchitectural and gross morphological analyses can serve as a powerful tool for gauging population health and resilience within gonochoristic fish populations. The Philippines boasts a robust neritic tuna fishery, with Bullet Tuna (Auxis rochei) being a significant species. Nonetheless, our understanding of reproductive parameters in neritic tunas remains deficient, hampering sustainable management strategies. In this study, 975 fish samples were collected from Sarangani Bay, Davao Gulf, Moro Gulf, and Sulawesi Sea.

Research Article | 22 Feb 2024
The Ovaries and Testes: A Gaze Towards the First Record of Gonad Morphogenesis through Macrostructure and Histoanatomy of Frigate Tuna (Auxis thazard) in Southern Philippines
John Christian D. Entia*, Niña Mae B. Nabre, Glennville A. Castrence, Blessie Justine G. Arellano, Red Arthur Duke Amoncio, James T. Wetzel, Edna P. Guevarra

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T he structural configuration of oogonial and spermatogonial models in oviparous species are key determinants of reproductive biological parameters, as these factors also determine gonadogenesis and spawning lengths. This study systematically characterized frigate tuna (Auxis thazard) collected from the southern Philippine waters, including Sarangani Bay, Davao Gulf, Moro Gulf, and the Sulawesi Sea. Characterization involved a comprehensive analysis of gross gonadal features, aided by gross morphological identification and histological profiling utilizing Hematoxylin and Eosin (H&E) staining.


Review Article 

Shrimp Infectious Diseases and Diagnostics in the Philippines

Shrimp farming accounts for a significant percentage of commercial aquaculture and is an integral part of the continuous growth of the economy, particularly in the Philippines.

Short Communication

Effects of Temperature and Diurnal Cycle in the Molting Schedule of Mangrove Crab, Scylla serrata (Forskål, 1775)

Soft-shell crab farming is gaining popularity since all crab parts can be eaten with almost no discards. However, its biggest challenge is the tedious monitoring every 4-hour interval to check for molting.

Research Article

Shading Influenced Water Quality and Seed Production of Nile Tilapia (Oreochromis niloticus L.) in the Hapa-within-Pond System During Warm Months

This study evaluated the influence of shading designs on water quality and Nile tilapia seed production in hapa-within-pond system. Metal frames were installed in three 200 m2 ponds and covered with greenhouse nets.

Annotated Checklist of Cartilaginous Fishes in Palawan Waters

An annotated checklist of 67 species of sharks, rays, and chimaeras (Chondrichthyes) confirmed to be present in Palawan waters was described based on (1) market visits in Puerto Princesa, Aborlan, Brookes Point, and Roxas between October 2021 and March 2022; (2) contributory citizen science soliciting photographs and video footage validated by the authors; and (3) review of various ichthyologic types of research in Palawan that include museum collection records, taxonomic papers, results of DNA analysis, institutional project reports, and related literature, particularly on the occurrence and distributional range of the species.

Impacts of Freshwater Fish Sanctuaries on Fish and Crustacean Diversity, Catch, and Household Income of Fisherfolk in Baggao, Cagayan, Philippines

The study was conducted from February to March 2022 to assess the impacts of fish sanctuaries on fish and crustacean diversity, catch, and income of fisherfolk in Baggao, Cagayan.

Population Dynamics of Shortfin Scad (Decapterus macrosoma) Bleeker 1851 in Babuyan Channel, Philippines

The study was conducted to determine the status of Decapterus macrosoma stocks in the Babuyan Channel. Data were collected from January 2016 to December 2017 following the standard methodology of the National Stock Assessment Program (NSAP).

Reproductive Biology of Bali Sardines, Sardinella lemuru (Bleeker, 1853), in Tayabas Bay, Quezon, Philippines

Fish reproductive biology plays a vital role in fishery management, an essential biological tool that would serve as a basis for formulating policies. In this study, 3,678 Sardinella lemuru were sampled to determine its reproductive biology characteristics from January 2014 to December 2016 at Tayabas Bay, Quezon.

Optimization of the Enzymatic Hydrolysis of Yellowfin tuna, (Thunnus albacares) Viscera by Response Surface Methodology

Tuna is abundant in the Philippines, but the by-products during processing in various forms may be a source of waste and environmental pollution. To minimize these wastes, they are utilized directly or fermented to serve as food for humans and animals and as a functional food ingredient since they are rich in proteins and polyunsaturated lipids.

Nutrient Composition and Heavy Metal Contents of Freshwater Sardine, Sardinella tawilis (Herre, 1927), in Taal Lake, Philippines

An assessment of the current nutrient composition and heavy metal contents of the only freshwater sardine, Sardinella tawilis (Herre, 1927), was conducted due to lake environment changes, recent episodes of volcanic eruptions, antiquated nutrient data, and food system influence.

Influence of Colors on the Catching Performance of Artificial Lures of Multiple Troll Line in Bongao Waters, Tawi-Tawi, Philippines

Improving the efficiency of fishing gears to catch species and sizes selectively and to catch more fish with less fishing efforts are essential objectives in fisheries research. This study utilized a small-scale multiple troll line, using two different artificial lures, i.e., green and blue, to determine the color lure preference of fish catch, catch composition, relative abundance, and catch per unit effort.

Diversity, Abundance, and Local Use of Fishes in Lake Danao, Ormoc City, Philippines

Lake Danao lies within the Lake Danao Natural Park in Ormoc City, Leyte, Philippines. The lake provides a habitat for various aquatic flora and faunal species. However, existing data on fish assemblage in Lake Danao is scarce and outdated. This study determined Lake Danao’s diversity, abundance, and local use of fish.

Policy Brief

eDNA Detection to Help Combat Illegal Fishing and Modern Slavery

  • Innovations in DNA-based identification and traceability can now be implemented in Philippine fisheries, serving as solutions that can keep pace with the complex, fast-moving global seafood supply chain.
  • Seafood fraud is prevalent in the fishing industry and can occur because of illegal fishing, some of which comes from vessels that utilize modern slavery.
  • With global seafood demand projected to rise through 2030, the challenges of illegal fishing and modern slavery at sea become increasingly linked; challenges which can be reduced by the adoption of emerging eDNA-based tools by both exporting and importing nations, including the Philippines and the United States.

Ensuring Aquatic Food Security in the Philippines

The human population of the Philippines is expected to reach 158 million by the year 2050, or an increase of 37% relative to 2022. This implies increased demand for aquatic food (or “fish” hereafter).