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Fisheries Science Hub, Manila, Manila (2026)

08/08/2026

𝙎𝙝𝙤𝙪𝙡𝙙 𝙮𝙤𝙪 𝙡𝙚𝙩 𝙨𝙪𝙣𝙡𝙞𝙜𝙝𝙩 𝙝𝙞𝙩 𝙮𝙤𝙪𝙧 𝙛𝙞𝙨𝙝 𝙩𝙖𝙣𝙠𝙨 𝙞𝙣 𝙖𝙦𝙪𝙖𝙥𝙤𝙣𝙞𝙘𝙨? 𝙁𝙤𝙧 𝙮𝙚𝙖𝙧𝙨, 𝙘𝙤𝙣𝙫𝙚𝙣𝙩𝙞𝙤𝙣𝙖𝙡 𝙬𝙞𝙨𝙙𝙤𝙢 𝙨𝙖𝙞𝙙 𝙉𝙊 — 𝙘𝙤𝙫𝙚𝙧 𝙩𝙝𝙤𝙨𝙚 𝙩𝙖𝙣𝙠𝙨 𝙤𝙧 𝙖𝙡𝙜𝙖𝙚 𝙬𝙞𝙡𝙡 𝙨𝙩𝙚𝙖𝙡 𝙣𝙪𝙩𝙧𝙞𝙚𝙣𝙩𝙨 𝙛𝙧𝙤𝙢 𝙮𝙤𝙪𝙧 𝙥𝙡𝙖𝙣𝙩𝙨!

This ten-month Auburn University study is the first to systematically test how sunlight exposure and system coupling/decoupling jointly affect biofloc aquaponics performance. Researchers grew Nile tilapia alongside two cherry tomato trials across four system types: dark-coupled, light-coupled, dark-decoupled, and light-decoupled.

Fish performance: Illuminated tanks produced 21% more fish biomass than covered tanks, and coupled systems outperformed decoupled ones by 22%. The best result came from light-coupled systems (551 g average fish weight, 100% survival), which combined algae as supplemental feed with the water-clarifying benefit of continuous filtration. Decoupled biofloc systems, despite hosting more algae and bacteria, suffered from excessive suspended solids (600 mg/L vs. just 16 mg/L in coupled systems), which limited fish growth.

Source:
Rezaei, S., Spoor, M., Hohn, G., Schorer, R., Bender, G., Cline, D., Wells, D. E., de-Bashan, L., & Higgins, B. (2026). Enhancing yields: The role of fish tank illumination and coupling/decoupling in biofloc aquaponics performance. Aquaculture, 613, Article 743286.

29/07/2026

𝘾𝙖𝙣 𝙨𝙝𝙧𝙞𝙢𝙥 𝙨𝙥𝙚𝙧𝙢 𝙗𝙚 "𝙗𝙖𝙣𝙠𝙚𝙙" 𝙛𝙤𝙧 𝙗𝙧𝙚𝙚𝙙𝙞𝙣𝙜?

This study evaluated short-term, low-temperature preservation of Pacific whiteleg shrimp (Penaeus vannamei) s***matophores as a practical alternative to cryopreservation, which has historically failed to yield s***m capable of fertilization in this species. Researchers from Océanos S.A. (Colombia) and collaborators preserved 432 s***matophores from 216 males in mineral oil at two temperatures, 10 °C and 24 °C, monitoring fertility, hatching rate, and nauplii deformity every 2 days over 24 days, and comparing results against naturally mated control females.

Naturally mated females consistently outperformed artificially inseminated ones, maintaining fertility around 66% and hatching rates around 94% throughout the trial. Spermatophores stored at 10 °C retained good fertilizing capacity for longer, with hatching rates staying above 50% through day 18 before dropping off, while s***matophores held at 24 °C declined much faster, falling below useful hatching rates by around day 8 and losing fertilizing capacity entirely by day 14. Deformity rates in resulting nauplii stayed low (under 5%) across all treatments and did not differ significantly between preserved and naturally derived s***m, suggesting the preservation method itself doesn't compromise offspring quality.

Mineral-oil preservation at 10 °C is commercially viable for up to 16 days, while storage at 24 °C should be limited to about 4 days. Notably, this technique has reportedly been used successfully for seven years in hatchery operations to enable controlled crossbreeding between geographically separated broodstock without the biosecurity risks of physically transporting live males — a practical tool for genetic management programs in shrimp aquaculture.

Reference:
Cataño, Y., Intriago, P., Shinn, A. P., Prieto-Guevara, M., & Atencio-García, V. (2025). Short term, low temperature preservation of the Pacific whiteleg shrimp Penaeus vannamei s***matophores. Asian Fisheries Science, 38(1), 1–7.

22/07/2026

𝘾𝙖𝙣 𝙖 𝙨𝙞𝙢𝙥𝙡𝙚 𝙚𝙜𝙜 𝙨𝙤𝙖𝙠 𝙘𝙝𝙖𝙣𝙜𝙚 𝙖 𝙛𝙞𝙨𝙝'𝙨 𝙨𝙚𝙭? 𝙁𝙤𝙧 𝙘𝙤𝙢𝙢𝙤𝙣 𝙘𝙖𝙧𝙥, 𝙩𝙝𝙚 𝙖𝙣𝙨𝙬𝙚𝙧 𝙞𝙨 𝙮𝙚𝙨!

This study investigated the use of 17α-methyltestosterone (MT) to masculinize common carp (𝘾𝙮𝙥𝙧𝙞𝙣𝙪𝙨 𝙘𝙖𝙧𝙥𝙞𝙤) through an egg immersion technique, an alternative to the more commonly studied fry immersion method. Researchers exposed incubating eggs to four hormone concentrations (200, 400, 600, and 800 µg/L) across three immersion times (48, 60, and 72 hours), then reared the fry for 120–150 days before assessing gonadal development.

Results showed a clear trade-off: increasing hormone concentration and immersion time steadily reduced egg hatching (from 73% down to 61%) and fry survival (from 74% down to 63%) relative to the untreated control (76% hatching, 80% survival). However, the same conditions dramatically increased masculinization — the male ratio rose from 49% in the control group to a peak of 96% at the highest dose (800 µg/L) combined with the longest immersion (72 hours). Treated fish also grew faster, reaching greater total length and body weight than controls, though their condition factor (K) declined with increasing hormone exposure. Histological examination confirmed s*x differentiation by identifying s***matogonia in male go**ds and oocytes in female go**ds, with some inters*x individuals also observed.

Reference:
Akhtar, S., Yasin, R., Samiullah, K., Malik, I. U., Fazal, R. M., Farooq, U., Saleem, U., Akhtar, R. W., & Qadeer, S. (2022). Hormonal s*x inversion by 17α-methyl testosterone in common carp (Cyprinus carpio) through egg immersion technique (IT). Journal of Applied Aquaculture. Advance online publication.

20/07/2026

𝙏𝙪𝙧𝙣𝙞𝙣𝙜 𝙧𝙞𝙘𝙚 𝙝𝙪𝙨𝙠𝙨 𝙞𝙣𝙩𝙤 𝙖 𝙜𝙖𝙢𝙚-𝙘𝙝𝙖𝙣𝙜𝙚𝙧 𝙛𝙤𝙧 𝙨𝙝𝙧𝙞𝙢𝙥 𝙛𝙖𝙧𝙢𝙞𝙣𝙜!

Shrimp farms built on acid sulfate soils (ASS) often struggle with acidic water and toxic dissolved metals, which threaten young shrimp survival and growth. This study tested biosilica made from rice husk ash (RHA) — an agricultural waste product — as a low-cost way to stabilize water quality in Pacific white shrimp (𝙇𝙞𝙩𝙤𝙥𝙚𝙣𝙖𝙚𝙪𝙨 𝙫𝙖𝙣𝙣𝙖𝙢𝙚𝙞) nursery ponds built on ASS-affected land.

Over a 21-day trial, researchers compared ponds treated with RHA-biosilica against untreated control ponds. Even though the soil still held high latent acidity after initial remediation, the biosilica treatment kept pond water notably more stable: pH stayed above 7.0 and silicate levels remained above 4.0 mg/L, while control ponds swung wildly (pH 5.5–8.0) and lost most of their silica. This stable silica supply favored beneficial diatoms (Thalassiosira and Navicula species) over harmful algae, preventing dangerous algal boom-and-bust cycles. As a result, treated ponds kept toxic ammonia at a very safe 0.02 mg/L, versus 1.23 mg/L in controls. While shrimp survival was high in both groups (over 93%), the biosilica-treated shrimp grew significantly larger, reaching 0.165 g final weight — a 31% increase in biomass over controls.

The findings suggest RHA-biosilica is a practical, circular-economy solution: turning rice-farming waste into a tool that makes marginal, acid-prone land more viable for productive, resilient shrimp farming.

Reference:
Tarunamulia, T., Paena, M., Akmal, A. et al. Rice husk ash-derived biosilica as a biogeochemical regulator for ameliorating acid sulfate soils in shrimp (Litopenaeus vannamei) nursery systems. Aquacult Int 34, 163 (2026).

19/07/2026

𝘿𝙞𝙙 𝙮𝙤𝙪 𝙠𝙣𝙤𝙬 𝙨𝙩𝙧𝙚𝙨𝙨 𝙡𝙚𝙖𝙫𝙚𝙨 𝙖 𝙩𝙧𝙖𝙘𝙚 — 𝙚𝙫𝙚𝙣 𝙞𝙣 𝙛𝙧𝙤𝙯𝙚𝙣 𝙛𝙞𝙨𝙝?

This study investigated whether cortisol — a key stress hormone — can be reliably measured in the fins of frozen, market-purchased rainbow trout as a way to retrospectively assess 𝙛𝙞𝙨𝙝 𝙬𝙚𝙡𝙛𝙖𝙧𝙚 after the harvest, rather than only in live fish.

Researchers from Kangwon National University (Korea) a**lyzed 16 frozen rainbow trout (average weight 362 ± 95 g) purchased from a local market. The study had two parts:

Study I: In 5 fish, cortisol was measured across six different fin types (adipose, pectoral, pelvic, dorsal, a**l, and caudal). Results showed the adipose fin had significantly higher cortisol than the caudal and dorsal fins, with a**l, pelvic, and pectoral fins showing intermediate levels.

Study II: In all 16 fish, cortisol was measured specifically in the caudal fin, since it's easy to sample and practical for repeated use. Levels ranged from 2.4–69.1 pg/mg (mean 13.1 ± 16.2 pg/mg), and were consistently low and stable across most fish, with two individuals showing notably higher levels — possibly indicating greater stress during farming or handling.

The caudal fin shows stable, low-variability cortisol levels, making it a practical, non-invasive biomarker for assessing chronic stress exposure even in fish that have already been frozen and sold. This could help improve aquaculture quality control, supply-chain transparency, and consumer confidence in fish welfare — without needing to test live fish. The authors note this is a pilot study and call for larger, more diverse follow-up research.

Reference:
Ataallahi, M., Kim, D.-W., Park, G.-W., & Park, K.-H. (2026). Cortisol a**lysis in market-frozen rainbow trout (Oncorhynchus mykiss). Fisheries and Aquatic Sciences, 29(6), 404–411.

16/07/2026

𝘽𝙞𝙜 𝙣𝙚𝙬𝙨 𝙛𝙤𝙧 𝘽𝙚𝙩𝙩𝙖 𝙗𝙧𝙚𝙚𝙙𝙚𝙧𝙨!

Researchers just cracked a smarter way to raise more male Siamese fighting fish — by "hiding" hormones inside baby brine shrimp (Artemia) that newborn Betta larvae naturally love to eat.

This study developed a method to masculinize Siamese fighting fish (Betta splendens) — an ornamental fish where males fetch higher market prices — by bioencapsulating the hormone 17α-methyltestosterone (17α-MT) in live Artemia nauplii. Since B. splendens larvae have tiny mouths and won't readily eat inert (dry) diets during their critical s*x-differentiation window, the researchers enriched brine shrimp nauplii with varying hormone concentrations (0, 5, 10, 20, 30, and 40 mg/L) and fed them to newly hatched larvae for 40 days.

Masculinization increased with hormone dose, reaching 94–95% male populations at 30 and 40 mg/L, compared to a natural 50/50 s*x ratio in the untreated control. For every 1 mg/L increase in 17α-MT concentration, the odds of a fish developing as female dropped by about 6%. Fish survival, weight, and length were not significantly affected by the hormone treatment, though a mild downward trend in weight was noted at doses above 20 mg/L. Mortality was high overall (especially in the first week of feeding), but this was linked to general larval-rearing challenges rather than the hormone itself.

Artemia-based bioencapsulation is a practical, low-mortality-risk method for delivering masculinizing hormones to fish species that require live feed early in life — offering a scalable alternative to inert hormone-laced diets for commercial Betta production.

Reference:
de Oliveira Neto, J. W., Padrão, D. H. B., Cyrino, J. E. P., & Cerozi, B. S. (2026). A live-feed hormone delivery protocol for the Siamese fighting fish (Betta splendens): Bioencapsulation of 17α-methyltestosterone in Artemia nauplii. Aquaculture International, 34, Article 192.

15/07/2026

𝐂𝐚𝐧 𝐀𝐈 𝐡𝐞𝐥𝐩 𝐬𝐚𝐯𝐞 𝐈𝐧𝐝𝐨𝐧𝐞𝐬𝐢𝐚'𝐬 𝐠𝐫𝐨𝐮𝐩𝐞𝐫 𝐟𝐚𝐫𝐦𝐬?

New research from Tokyo University of Agriculture & Indonesia's Ministry of Marine Affairs and Fisheries shows how real-time sensors + machine learning can predict fish mortality risk up to 3 days in advance — with nearly 79% accuracy!

By tracking water temperature, salinity, and turbidity, this AI-powered dashboard helps fish farmers plan feed and labor before disaster strikes, tackling mortality rates that have topped 70% at some sites. A smart step toward more sustainable aquaculture!

Reference:
Saville, R., Fujiwara, A., Hatanaka, K., Wada, M., Yaman, A., Puspasari, R., Albasri, H., & Dwiyoga, N. (2026). AI-powered decision support system for mariculture: Real-time fish mortality prediction with random forest. Aquacultural Engineering, 112, Article 102621.

14/07/2026

𝙒𝙝𝙖𝙩 𝙞𝙨 𝘽𝙎 𝙁𝙞𝙨𝙝𝙚𝙧𝙞𝙚𝙨?

BS Fisheries is a science-based degree program that explores fish, aquatic ecosystems, aquaculture, capture fisheries, fish health, post-harvest technology, and the sustainable management of aquatic resources.

Through classroom instruction, laboratory activities, fieldwork, hatchery and fishpond training, research, and community engagement, students develop the knowledge and practical skills needed to address challenges in food security, biodiversity conservation, climate resilience, and responsible fisheries development.

Graduates can build careers in aquaculture, research, education, fisheries extension, seafood processing, environmental management, policy, law enforcement, conservation, and many other fisheries-related fields.

𝐒𝐭𝐮𝐝𝐲 𝐚𝐪𝐮𝐚𝐭𝐢𝐜 𝐥𝐢𝐟𝐞. 𝐀𝐩𝐩𝐥𝐲 𝐬𝐜𝐢𝐞𝐧𝐜𝐞. 𝐒𝐮𝐩𝐩𝐨𝐫𝐭 𝐜𝐨𝐦𝐦𝐮𝐧𝐢𝐭𝐢𝐞𝐬. 𝐇𝐞𝐥𝐩 𝐛𝐮𝐢𝐥𝐝 𝐚 𝐬𝐮𝐬𝐭𝐚𝐢𝐧𝐚𝐛𝐥𝐞 𝐟𝐮𝐭𝐮𝐫𝐞.

𝐇𝐞𝐫𝐞 𝐚𝐫𝐞 𝐬𝐨𝐦𝐞 𝐨𝐟 𝐭𝐡𝐞 𝐜𝐚𝐫𝐞𝐞𝐫𝐬 𝐚 𝐁𝐒 𝐢𝐧 𝐅𝐢𝐬𝐡𝐞𝐫𝐢𝐞𝐬 𝐠𝐫𝐚𝐝𝐮𝐚𝐭𝐞 𝐜𝐚𝐧 𝐩𝐮𝐫𝐬𝐮𝐞!

𝐃𝐢𝐬𝐜𝐥𝐚𝐢𝐦𝐞𝐫: 𝙏𝙝𝙚 𝙞𝙢𝙖𝙜𝙚𝙨 𝙞𝙣 𝙩𝙝𝙞𝙨 𝙥𝙤𝙨𝙩 𝙬𝙚𝙧𝙚 𝙘𝙧𝙚𝙖𝙩𝙚𝙙 𝙬𝙞𝙩𝙝 𝙩𝙝𝙚 𝙖𝙨𝙨𝙞𝙨𝙩𝙖𝙣𝙘𝙚 𝙤𝙛 𝙖𝙧𝙩𝙞𝙛𝙞𝙘𝙞𝙖𝙡 𝙞𝙣𝙩𝙚𝙡𝙡𝙞𝙜𝙚𝙣𝙘𝙚 𝙛𝙤𝙧 𝙞𝙣𝙛𝙤𝙧𝙢𝙖𝙩𝙞𝙤𝙣 𝙖𝙣𝙙 𝙞𝙡𝙡𝙪𝙨𝙩𝙧𝙖𝙩𝙞𝙫𝙚 𝙥𝙪𝙧𝙥𝙤𝙨𝙚𝙨 𝙤𝙣𝙡𝙮. 𝙏𝙝𝙚 𝙞𝙢𝙖𝙜𝙚𝙨 𝙖𝙧𝙚 𝙞𝙣𝙩𝙚𝙣𝙙𝙚𝙙 𝙩𝙤 𝙚𝙣𝙜𝙖𝙜𝙚 𝙖𝙣𝙙 𝙞𝙣𝙛𝙤𝙧𝙢, 𝙣𝙤𝙩 𝙩𝙤 𝙢𝙞𝙨𝙧𝙚𝙥𝙧𝙚𝙨𝙚𝙣𝙩 𝙩𝙝𝙚𝙢𝙨𝙚𝙡𝙫𝙚𝙨 𝙖𝙨 𝙧𝙚𝙖𝙡 𝙥𝙝𝙤𝙩𝙤𝙜𝙧𝙖𝙥𝙝𝙨.

14/07/2026

Beyond the headlines about territorial disputes, the West Philippine Sea is home and livelihood to thousands of Filipino fisherfolk. A new study in the Philippine Political Science Journal reframes the WPS conversation — arguing that real security isn't just about sovereignty, it's about protecting the people and ecosystems that depend on these waters. And the threats aren't only coming from outside our borders.

Key points:

Economic stakes: The WPS supplies roughly 7% of the Philippines' fish production and is estimated to contribute tens of billions of dollars to the economy, sustaining thousands of fisherfolk in coastal communities.

Environmental security framework: Drawing on scholars like Barnett, Zurlini and Muller, and the UN Millennium Project, the authors position environmental degradation, resource scarcity, and livelihood loss as security issues in their own right — not just side effects of geopolitical rivalry.

Political ecology lens: The paper applies Homer-Dixon and Libiszewski's theories of environmental conflict to the WPS, while noting the theories need adaptation since the WPS involves nation-states and doesn't fit a classic "population pressure" model.

Dual threats: Importantly, the article argues that threats to local fishers come not only from China's reclamation activities and fishing bans, but also internally — from large-scale commercial Filipino fishing operations that evade monitoring (VMS) and encroach on municipal waters meant for artisa**l fishers, sometimes with court backing.

Diplomatic pathways: The authors survey alternative, non-traditional diplomatic channels (Track 1.5, 2, and 3 diplomacy) — such as multi-stakeholder bodies, epistemic communities, people-to-people diplomacy, and town-twinning — using models like the Mekong River Commission and ASEAN Centre for Biodiversity, while acknowledging these may not transfer easily to the WPS given its active territorial dispute.

Domestic dispute resolution: The article also examines internal Philippine mechanisms (courts, EIA processes, alternative dispute resolution) for resolving conflicts between artisa**l and commercial fishers.

Read the whole paper:
Contreras, A. P., & Ancog, R. C. (2025). Environmental security and local livelihoods: Challenges and opportunities in the West Philippine Sea. Philippine Political Science Journal, 45, 247–271.

13/07/2026

Unveiling Gender Inequities in Small-Scale Fisheries and Aquaculture in East Africa: A Harvard Analytical Framework Approach

This review examines gender inequities in small-scale fisheries and aquaculture across Kenya, Uganda, and Tanzania using the Harvard Analytical Framework (HAF), synthesizing peer-reviewed and grey literature published between 2015 and 2025. The authors organize their a**lysis around four HAF components: activity profiles (who does what), access and control over resources (who owns/decides what), influencing factors (socio-cultural, institutional, economic drivers), and project cycle a**lysis (how gender is integrated into development interventions).

The findings show that gender gaps are least about participation and most about power. Women are heavily involved across fisheries and aquaculture value chains — especially in post-harvest processing, retail, and (notably) seaweed farming, where they often dominate — yet they remain concentrated in lower-value, labor-intensive roles. Men retain control over boats, fishing gear, land, aquaculture infrastructure, credit, licensing, and leadership positions in governance bodies like Beach Management Units. These disparities are reinforced by discriminatory inheritance systems, exclusionary training and extension services, patriarchal social norms (including taboos restricting women's access to fishing), and market structures that leave women dependent on male-controlled supply chains — sometimes exposing them to exploitative transactional arrangements.

The paper's central argument is that development interventions have tended to expand women's participation without addressing the underlying structural barriers to ownership and authority, thereby inadvertently reproducing inequality. The authors call for structural reforms: joint land/water tenure, gender-responsive financing and credit guarantees, legally anchored representation in governance bodies (not just symbolic seats), and monitoring frameworks that track asset ownership and decision-making power — not just headcounts. They frame gender equity as a governance and productivity imperative for an inclusive "blue economy," while acknowledging limitations tied to their reliance on secondary literature rather than original fieldwork.

Reference:
Ouko, K. O., Yugi, C. L., Oketch, M. O., Njogu, L., Mboya, J. B., Ogola, R. J., Aboge, D., Muthoka, M., & Midamba, D. C. (2026). Unveiling gender inequities in small-scale fisheries and aquaculture in East Africa: A Harvard Analytical Framework approach. Aquaculture, Fish and Fisheries, 6(2), Article e70210.

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