Crocodilians and fisheries in the Philippines: revisiting Fittkau’s hypothesis

2020 ◽  
Vol 14 (2) ◽  
Keyword(s):  
Primary Productivity ◽  
The Philippines ◽  
Estuarine Fish ◽  
Confounding Factors ◽  
Fishing Pressure ◽  
Catch Per Unit Effort ◽  
Fish Catch ◽  
Crocodylus Porosus ◽  
Secondary Productivity ◽  
Palawan Island

Crocodilians have been assumed to influence aquatic primary productivity and fishery yield. However, strong empirical evidence to support such claims is lacking. The long-standing assumption first hypothesized by Fittkau (1970), is that local fisheries (secondary productivity) in areas inhabited by crocodilians would be expected to improve. We tested this hypothesis at two locations in the Philippines, inhabited by the Philippine Crocodile (Crocodylus mindorensis) in Paghungawan Marsh in Siargao Island Protected Landscape & Seascape (SIPLAS), Jaboy, Pilar, Surigao Del Norte, and the Indo-Pacific Crocodile (Crocodylus porosus) in the Rio Tuba River, Bataraza, southern Palawan Island. Water chemistry parameters, with emphasis on nutrient (nitrate and phosphate) levels, were determined using using standard protocols. Catch-per-Unit Effort (CPUE) of gillnets in sites with crocodiles was compared with corresponding control sites without crocodiles. CPUE was higher in areas inhabited by crocodiles, but appeared not to be directly influenced by nutrient levels. Increased fish catches in areas inhabited by crocodiles might be attributed to several factors, such as reduced fishing pressure due to the presence of crocodiles which discouraged the local fishermen to fish intensively. Overall, while fish catch was higher in areas inhabited by crocodiles, it is too early to attribute this to the nutrient output from crocodiles due to several confounding factors. KEYWORDS: estuarine, fish catch, freshwater, nutrient

Some Dilemmas of Political Consumerism

2018 ◽  
pp. 720-740
Author(s):  
Sarah Webb ◽  
Anna Cristina Pertierra
Keyword(s):  
Middle Class ◽  
Environmentally Friendly ◽  
The Philippines ◽  
Rural Poor ◽  
Political Consumerism ◽  
Palawan Island ◽  
Class Distinction

In the Philippines, socioeconomic relations that result from deeply uneven market engagements have long made consumption a moral affair. Ecoconscious lifestyles and consumer practices remain largely the domain of elite and middle-class Filipinos, and as such, engagement with sustainable and environmentally friendly consumption may be seen not only as a marker of class distinction but also as a critique of urban and rural poor livelihood practices deemed to be environmentally detrimental. Focusing on a case study from Palawan Island, the chapter discusses some dilemmas that have arisen as the application of “eco” to tourism practices has become widespread and attractive to middle-class Filipinos with steadily growing spending power. The relevance of class to considering dilemmas of political consumerism is not unique to the Philippines, and these issues provide an opportunity to critically reflect on who benefits from political consumerism.

scholarly journals Preliminary assessment of surf-zone and estuarine line-fish species of the Dwesa-Cwebe Marine Protected Area, Eastern Cape, South Africa

Koedoe ◽  
2012 ◽  
Vol 54 (1) ◽  
Author(s):  
Jan A. Venter ◽  
Bruce Q. Mann
Keyword(s):  
South Africa ◽  
Law Enforcement ◽  
Fish Species ◽  
Protected Area ◽  
Surf Zone ◽  
Marine Protected Area ◽  
Fish Populations ◽  
Estuarine Fish ◽  
Catch Per Unit Effort ◽  
Preliminary Assessment

A preliminary assessment of surf-zone and estuarine line fish was carried out in the DwesaCwebe Marine Protected Area (MPA), on the Wild Coast, South Africa. The purpose was to provide baseline data on inshore line-fish stocks in the MPA. A total of 28 species was recorded, of which 53% have a conservation status reflecting some concern and 43% are endemic to southern Africa. This highlights the value of the MPA for protection of important line-fish species. Within the MPA, localised differences were detected in species diversity, size frequency and catch per unit effort between unexploited and illegally exploited areas. These differences were more prominent in slow growing, long-lived species. It thus appears that illegal exploitation is negatively affecting fish populations within the MPA, which counteract and potentially could eliminate the benefits of fish protection typically associated with no-take MPAs. These results highlight the need for improved law enforcement and better communication with neighbouring communities to increase awareness. It is further recommended that the current no-take status of the MPA should be maintained. In addition, baseline fisheries information was collected on certain fish species that could be used to inform future conservation management of the MPA.Conservation implications: The Dwesa-Cwebe Marine Protected Area is unique and important for the conservation of key surf zone and estuarine fish species. However there is a significant risk to the fish populations due to illegal exploitation. Key interventions should include enhanced law enforcement but, more important, the creation of alternative livelihoods and long term sustainable benefits to local communities.

scholarly journals Gill net Selectivity and Fishing Pressure on Indian Major Carp in Thirumoorthy Reservoir, Tamil Nadu

2016 ◽  
Vol 11 (2) ◽  
pp. 554-559 ◽  
Author(s):  
R Velmurugan ◽  
N Neethiselvan ◽  
B Sundaramoorthy ◽  
Xavier Rayan ◽  
Kalidoss Radhakrishnan ◽  
...  
Keyword(s):  
Tamil Nadu ◽  
Labeo Rohita ◽  
Monsoon Season ◽  
Catla Catla ◽  
Fishing Pressure ◽  
Catch Per Unit Effort ◽  
Indian Major Carp ◽  
Gill Net ◽  
Dominant Fish ◽  
Post Monsoon Season

In present study attempts has been made to document the fishing crafts and gears which operated in Thirumoorthy reservoir, Tamil Nadu. This investigation revealed, the post monsoon season had higher catch per unit effort of 11kg/boat/day by gillnet fishing and about 20 to 30kg/day in cast net. Catla catla has the dominant fish species and accounted about 58% followed by Cirrhinus mrigala (29%), Labeo rohita (12%) and Cyprinus carpio (2%) against the total landings. However, three species including the Tilapia, Rohu and Mrigala were found to constitute fishery in the cast net with mean CPUE of 20 to 30 kg per day.

scholarly journals The effect of escape gaps of cylinder folding traps on fish catch at the coastal waters of Tuban Regency

2021 ◽  
Vol 322 ◽  
pp. 03002
Author(s):  
Farrel Nafis Adyatama ◽  
Ghassan Nurul Huda ◽  
Nahla Alfiatunnisa ◽  
Faizal Rachman ◽  
Supardjo Supardi Djasmani ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Marine Organisms ◽  
Total Weight ◽  
Total Catch ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Significant Difference ◽  
Fish Catch ◽  
Swimming Crabs

The purpose of this study is to determine the effect of the escape gap of cylinder folding trap on catch per unit effort (CPUE), trap rate, composition, and size of fish caught in the coastal waters of Tuban Regency. The research was conducted in November 2019 by deploying 60 units in ten experimental fishing trips at different locations. The traps were 20 units without escape gap, 20 units with an escape gap of 3 cm x 6 cm, and 20 units with an escape gap of 4 cm x 7 cm. Overall, the experiments resulted in a collection of 22 species of marine organisms, such as swimming crabs (33% of total weight), snails, shrimps, crabs, fishes (55% of total weight), and cuttlefish. The highest CPUE was found for the traps with escape gaps of 4 cm x 7 cm, i.e., 9.18 gr/trap/trip. There was no significant difference in the total catch, the weight of catches, trap rate, and catch per unit effort (CPUE) among the three types of traps.

REDD Policy Impacts on Indigenous Property Rights Regimes on Palawan Island, the Philippines

Human Ecology ◽  
2012 ◽  
Vol 40 (5) ◽  
pp. 679-691 ◽  
Author(s):  
Wolfram Dressler ◽  
Melanie McDermott ◽  
Will Smith ◽  
Juan Pulhin
Keyword(s):  
Property Rights ◽  
The Philippines ◽  
Policy Impacts ◽  
Palawan Island ◽  
Indigenous Property Rights

Comparison of Reef Fish Catch per Unit Effort and Total Mortality between the 1970s and 2005-2006 in Onslow Bay, North Carolina

2008 ◽  
Vol 137 (5) ◽  
pp. 1389-1405 ◽  
Author(s):  
Paul J. Rudershausen ◽  
Erik H. Williams ◽  
Jeffrey A. Buckel ◽  
Jennifer C. Potts ◽  
Charles S. Manooch
Keyword(s):  
North Carolina ◽  
Reef Fish ◽  
Total Mortality ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Fish Catch

Allelic diversity in the merozoite surface protein 1 gene of Plasmodium falciparum on Palawan Island, the Philippines

2007 ◽  
Vol 56 (3) ◽  
pp. 185-194 ◽  
Author(s):  
Naoko Sakihama ◽  
Masatoshi Nakamura ◽  
Antonio A. Palanca ◽  
Renee A. Argubano ◽  
Ester P. Realon ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Allelic Diversity ◽  
Surface Protein ◽  
Merozoite Surface Protein ◽  
The Philippines ◽  
Merozoite Surface Protein 1 ◽  
Palawan Island
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