LEVIN H. CAMPBELL, Circuit Judge.

This is an action brought by the State of Maine seeking a declaration that the quotas set by the United States Secretary of Commerce for foreign fishing of herring stock in certain offshore waters of Maine is in violation of the Fishery Conservation and Management Act, 16 U.S.C. § 1801 et seq., (the "Act"). The area, so called 5Z-SA6, includes the Georges Bank fishing grounds. The Secretary published regulations under the Act governing herring fishing on February 11, 1977, and the plaintiffs brought this challenge on February 28. At the plaintiff's request, the Department of Commerce reexamined its quotas, and the district court postponed taking action until the review could be completed. The administrative record was reopened and hearings were held on April 19 and 20. On May 13, the Department announced it would not change the limits set on the herring catch, although it did not make one minor modification in the rules for tabulating the catch. On July 18, the district court held a hearing and then granted defendant's motion for summary judgment and dismissed the complaints. Plaintiffs appealed, seeking expedited review of the dismissal in this court.

The Fishery conservation and Management Act, enacted on April 13, 1976, established a two hundred mile fishery conservation zone around the United States within which fishing by foreign vessels is prohibited, except to the extent authorized by the Act. To coordinate the various economic, ecological, and other interests in fish stock, § 1852 of the Act established eight Regional Fishery Management Councils, each with authority to prepare and submit to the Secretary of Commerce a fishery management plan for the species within its geographical area. Section 1821(g) provides that in the event the Secretary is notified that eligible foreign vessels have applied for permission to fish in protected waters and she determines that a management plan for the species sought to be fished will not be prepared by the appropriate regional council before March 1, 1977, she shall prepare a preliminary fishery management plan for those species. To the extent practicable, the Secretary is required to adhere to the same procedures of notice and hearing and same substantive standards that the regional council would have used had it promulgated a plan. 16 U.S.C. §§ 1821(g); 1851-61.

Before enactment of the Fishery Conservation and Management Act, the Georges Bank fishery had been managed by the International Commission for the Northwest Atlantic Fisheries (ICNAF), an international organization from which the United States withdrew at the end of 1976. ICNAF had a spotty record as a conservator of fishing resources, and in particular had permitted the Georges Bank herring stock to sink below acceptable levels. In recent years, however, the member nations had begun to recognize the long term dangers of a depleted fishing stock and gradually reduced their catches. At a meeting of ICNAF delegates in June, 1976, scientific advisory committee reported that 50,000 metric tons (M.T.) could be taken from the Georges Bank herring stock in 1977 without further decreasing the school population. The Commission agreed to reduce this quota to 33,000 m.t. To permit some replenishment. The allocation of the agreed maximum catch among the member nations took place at a meeting in December, 1976, shortly before the American withdrawal. The United States originally had sought a quota of 18,000 m.t. for its own fishermen but agreed to a reduction to 12,000 m.t. in return for economic concessions from the Federal Republic of Germany and acceptance by all the members of a limited fishing season for foreign fishermen.

Because the New England Regional Council would not be able to prepare a management plan for Georges Bank by the March 1 deadline, and in anticipation of applications to fish the area by foreign vessels, the Secretary prepared a draft preliminary management plan in September, 1976. Hearings were held, comments were received and responded to, and the final plan was published in February, 1977. The Secretary then determined the "optimum yield" of herring for the duration of the plan, a key factor which the Act requires to be ascertained. She also estimated that a portion of this quota would be harvested by United States fishermen and remitted the balance to be apportioned among foreign fishermen. Following the ICNAF guidelines, the Secretary determined that the optimum yield for Georges Bank herring in 1977 would be 33,000 m.t. and the United States share would be 12,000 m.t. The reminder was allocated according to the ICNAF quotas negotiated in December.

The evidence before the Secretary indicated that present stocks in Georges Bank approximate 218,000 m.t., below the level at which recruitment failure of herring is feared (225,000 m.t.). It was projected that an allowed yield of 33,000 m.t. in 1977 will permit the hearing stocks to increase by some ten to thirteen percent by 1978, bringing the stock to a level of 247,000 m.t. Even so, that level will be substantially below the 350,000-500,000 m.t. level which experts regard as an appropriate, healthy stock for the area. Until the stock can be rebuilt to that level, it would obviously be imprudent to allow fisherman to catch herring at the rate of 100,000 to 150,000 m.t. per annum, the figures said by the Government's expert to be the area's "maximum sustainable yield".

Maine argues that since the stock has declined to well below the norm for a healthy stock, and is indeed below the 225,000 m.t. "danger" level, the Act must be construed to ban foreign fishing altogether. The allowable level of foreign fishing under the statute "shall be that portion of the optimum yield . . . which will not be harvested by vessels of the United States". § 1821(d). Maine attacks the Secretary's 33,000 m. t. optimum yield figure as too high, and the Secretary's allocation of 12,000 m.t. to U.S. vessels as too low.

Maine's second point is readily disposed of. The Secretary's assessment of domestic fishing potential was supported by substantial evidence in the record. American fishermen have taken an average of 2,000 m.t. annually from Georges Bank since 1960 and have never exceeded an annual catch of 4,600 m.t. during that period. In 2976 domestic fishermen took 735 m.t. from the stock. Although evidence was presented to the agency indicting a growing desire on the part of American fishermen to increase their herring take from Georges Bank, the Secretary heard and credited evidence as to the economic infeasibility of greatly expanded fishing operations at this time. Contrary to Maine's contention, the plaintiffs had sufficient notice that economic considerations would be a factor in weighing the potential domestic catch. The district court properly sustained the portion of the preliminary management plan that estimated the potential American catch for 1977. This figure, of course, is subject to further consideration for future years.

Turning to Maine's attack on the optimum yield estimate, it is to be noted that Maine does not quarrel with the basic data testified to by Dr. Anthony, the Government's expert. Maine accepts his thesis that a yield of 33,000 m.t. will allow for at least a ten percent recoupment of the stock in 1977, although it points out that the stock is now dangerously depressed.

The state's chief contention is that where an area's stock is so depressed as to be unable to maintain fishing at the level of the maximum sustainable yield, priority has to be given to cultivating a surplus so as to rebuild the stock as rapidly as possible, with only U.S. fishing to be allowed.

So stated, we have to agree with the district court that the argument is without support in the Act. We find nothing in the Act which declares that all foreign fishing is to be disallowed whenever stocks are incapable of sustaining the MSY. The statute does, it is true, give first crack at the "optimum yield" to U.S. fishermen. Only such portion thereof "as will not be harvested by vessels of the United States" is available to foreign vessels. But we find nothing in the Act which prescribes a particular annual rate at which a below-par stock need be rebuilt. To be sure, the strong conservation and management aims of the Act clearly preclude the setting of an optimum yield which permits over fishing, see 16 U.S.C. § 1801; but the Secretary's present allotment is based on credible evidence that 33,000 m.t. will allow a ten percent increase in the stock. We cannot say this rate of increase is too slight to promote the purposes of the Act.

Maine is on firmer ground, however, insofar as it questions the adequacy of the present record to show that the Secretary considered fully the Act's definition of optimum yield in promulgating the 33,000 m.t. figure. The "optimum" yield, as defined in the Act, must be selected "on the basis of" the maximum sustainable yield as modified by "any relevant economic, social or ecological factor". In addition, the optimum yield must be such as "will provide the greatest overall benefit to the Nation, with particular reference to food production and recreational opportunities". Arguably the Nation would be better benefited by leaving in the sea the 21,000 m.t. allotted to foreign vessels, thus allowing a faster buildup of stock. Or, put another way, the optimum yield figure should perhaps be no higher than what is likely to be taken by United States vessels, thus leaving nothing for the foreigners. There is virtually nothing in the record to reflect a rational weighing of these considerations by the Secretary. To the contrary, there is some suggestion that the Secretary may have uncritically taken ICNAF's total allowable catch figure on the assumption that optimum yield and total allowable catch were the same thing. However, optimum yield requires a finding, among others, that the figure selected reflects the greatest overall benefit to this nation.

This is not to question that the "greatest overall benefit to the Nation" criterion, and the companion reference to "relevant economic, social or ecological" factors, both found in the 16 U.S.C. § 1802(18) definition of "optimum" yield, are broad enough to include such national benefits as are to be derived from permitting foreign fishing. While the Act, in its preamble, makes clear that it was enacted in reaction to the ineffectiveness of international fishery agreements to prevent over fishing, § 1801(a), it speaks of a purpose, among others, to encourage such international agreements in the future, and to encourage continued active United States efforts to obtain an internationally acceptable treaty at the upcoming Third United National Conference on the Law of the Sea. § 1801(c)(5). Congress plainly did not intend the cardinal aim of the Act — the development of a United States' controlled fishing conservation and management program designed to prevent over fishing and to rebuild depleted stocks — to be subordinated to the interests of foreign nations. But within a framework of progress towards this goal, the Secretary is directed and empowered within specified limits to accommodate foreign fishing, §§ 1801(c)(4); 1821. We find no congressional purpose that she disregard the benefits to be derived from cooperating with other nations. American consumers depend not only on United States producers; they benefit from our trade with the rest of the world. United States fishermen as well as consumers benefit from international cooperation. Indeed, the continued existence of fish stocks throughout the oceans of the world may well be dependent on actions by foreign nations as well as ourselves. Management of the oceans' fish resources cannot be accomplished solely within our own coastal areas. We think Congress did not require the Secretary to set optimum yield figures entirely without regard to the effects upon this country of allowing or denying foreign fishing.

On the other hand, Congress has expressly directed the Secretary to consider the overall welfare of the United States in setting the optimum yield figure. Our nation's welfare may be considered in terms of its foreign elations as well as its purely domestic needs, but the touchstone is the benefit of this nation, not that of some other. Moreover, by "particular reference to the food supply", Congress underscored that priority was to be given to food requirements: the nation's fisheries were not, for example, to be swapped for a world banking agreement. The international considerations that are given weight must ordinarily relate to fishing, fish and other activities and products pertaining to the food supply (apart from any recreational benefits).

While we, therefore, conclude that the Secretary could consider the effect of international factors on this nation's welfare in setting an optimum yield figure, we are troubled by the lack of information in the record indicating what factors the Secretary considered in the instant case. The figure of 33,000 m.t. adopted by the Secretary was taken unaltered from the quota determined by ICNAF. The final plan stated:

Since the US withdrew from ICNAF, the decisions made in that forum are no longer binding. However, the scientific assessments made in ICNAF are the bases of the PMP.

The record would indicate that more than the scientific assessments of ICNAF went into the plan. Fore example, the Secretary accepted the compromise figure for the United States catch set by the December ICNAF meeting, even though the bargaining over the figure had little to do with scientific judgment.

Before the draft plan had become final, several persons criticized the allotment to foreign fishermen as not justified by corresponding benefits to the United States. The point was made most directly in a comment letter from the National Coalition for Maine Conservation, Inc.:

It is inaccurate and misleading to characterize ICNAF's determination of total allowable catch as a "determination of optimum yield", because optimum yield is a defined term in the Act and the considerations taken into account by ICNAF bear no relation to the considerations required by the Act to be taken into account in determining optimum yield as defined therein.

The Department of Commerce responded:

The [ICNAF total allowable catch] figures are determined by USA scientists working in cooperation with qualified scientists from other nations as part of a long-range program to maximize productivity from the resource given a set of management goals or options agreed upon As such, the TAC should provide the greatest "overall benefit to the nation" as long as USA requirements (which are based on socio-economic considerations) are first satisfied.

After the plan was published in final form, representatives of Maine renewed the criticism. At the hearing held on April 19, Mr. William Gordon, the Regional Director for the National Marine Fisheries Service and a member of the American delegation to the December, 1976, ICNAF meeting, explained that the allocation to the Federal Republic of Germany was based on reciprocal economic benefits but that the balance of the foreign quota was intended only to accommodate those countries with historical fisheries in the area.

None of this evidence indicates by itself that the Secretary ignored her statutory duty to weigh benefits to the United States in allocating a portion of the 1977 herring catch to foreign fishermen. In adopting the ICNAF quotas, the Secretary may very well observed international considerations not immediately apparent to the United States delegation. The Secretary certainly is in a much better position to observe interrelationships among particular international economic concessions that would lead to significant advantages for the nation. At the same time, these considerations are not apparent from the record, with the exception of the advantages obtainable from the Federal Republic of Germany allocation.

Where Congress has vested the authority to resolve technical questions of fact in a specialized administrative body with experience and expertise in that field, considerable deference is due its conclusions. Federal Power Commission v. Florida Power Light, 404 U.S. 453, 463, 92 S.Ct. 637, 30 L.Ed.2d 600 (1971). At the same time, the record must provide some basis for a reviewing court to determine that the agency has exercised its discretion consistently with standards set by Congress. Camp v. Pitts, 411 U.S. 138, 93 S.Ct. 1241, 36 L.Ed.2d 106 (1973); Citizens to Preserve Overton Park v. Volpe, 401 U.S. 402, 416, 91 S.Ct. 814, 28 L.Ed.2d 136 (1971); First Bank and Trust Co. v. Smith, 509 F.2d 663 (1st Cir. 1975). Judicial review cannot take place in a vacuum. Cf. Camp v. Pitts, supra, 411 U.S. at 142-43, 93 S.Ct. 1241; Citizens to Preserve Overton Park v. Volpe, supra, 401 U.S. at 420, 91 S.Ct. 814.

The foregoing leads us to this conclusion: while Maine has not at this time persuaded us that the Secretary's optimum yield figure is necessarily "arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law", 5 U.S.C. § 706(2)(A), it has persuaded us that, in order to obtain the judicial review to which Maine is entitled, the Secretary must provide some "additional explanation of the reasons for the agency decision." Camp v. Pitts, supra, 411 U.S. at 143, 93 S.Ct. at 1244 (1973). There is sufficient indication of possible misunderstanding on the Secretary's part of the criteria applicable to the "optimum" yield figure to render it improper for a court merely to rely upon the presumptive correctness of the Secretary's bottom line result. We think the Secretary should be asked to supplement the record to provide an explanation of the basis of her optimum yield determination insofar as it exceeds amounts needed by United States fishermen and provides for less than the optimum rebuilding of the stock.

On the other hand, although the present record is inadequate, leading us to require the Secretary to address the deficiencies, it does not follow that Maine has as yet made a showing which will entitle it to receive equitable relief, in the form of an injunction against implementation of the preliminary management plan pending production of the Secretary's supplemental explanation. Cf. Camp. v. Pitts, supra, 411 U.S. at 143, 93 S.Ct. 1241. Because the foreign fishing season is hard upon us and of limited duration, interference with implementation would come close to reversing the Secretary's decision. Having in mind both plaintiff's burden of proof and the broad implementation authority vested in the Secretary's decision. Having in mind both plaintiff's burden of proof and the broad implementation authority vested in the Secretary by Congress, we cannot at present say that it is unlikely that the Secretary can demonstrate a reasonable basis for the decision, or that it is likely that domestic fishermen will suffer irreversible harm from the plan. While the Act requires a determination reflecting substantive consideration, something not satisfied by resort to a conclusory verbal formula, the likelihood of the Secretary specifying relevant factors which would support a conclusion that setting the yield at this figure, which will allocate a portion of the Gorges Bank herring catch to foreign fishermen, will serve "the greatest overall benefit to the Nation," would seem substantial. And both parties conceded that the present quota would probably permit some rebuilding of the stock, thereby increasing the resource available to domestic fishermen in the future. In light of these consideration, we are constrained to let the present plan go forward at least until such time as the Secretary supplements the record and it can be ascertained whether or not the 33,000 m.t. figure is rationally supported. However, Maine is entitled to speedy supplementation of the present record, and to further review thereof in the district court, with all reasonable dispatch. Accordingly, in remanding we direct the district court to order forthwith that the Secretary specify and file in court within ten days from the date of the present judgment the reasons which led her to conclude that an optimum yield figure of 33,000 m.t., which allows foreign fishermen to take herring from a depleted stock, provides the greatest overall benefit to the Nation, with particular reference to food supplies and recreation, and including relevant economic, social or ecological factors.

Remanded for proceedings in accordance herewith.